ABB 3BHB006457R0001 Power Diode | D1031SH45TS02 | 4500V | 1120A | Fast Recovery Diode | Clamping Diode | Freewheeling Diode | 100mm Disc Package | Ceramic Housing | Press Mount | Double-Sided Cooling

1. Product Overview

The ABB 3BHB006457R0001 (model D1031SH45TS02) Power Diode is a high-voltage high-current fast recovery clamping diode specifically designed for high-power power electronic applications, particularly used as anti-parallel freewheeling diode and clamping protection diode for IGCT (Integrated Gate-Commutated Thyristor) and press-pack IGBT (Insulated Gate Bipolar Transistor). It is a core power semiconductor device in medium-voltage high-power variable frequency drives, inverters, rectifiers and other power electronic equipment.

In modern high-power power electronic systems, power diodes are indispensable basic components. In voltage source inverters (VSI), each IGBT or IGCT switching device requires an anti-parallel freewheeling diode to provide a freewheeling path for inductive load current. In clamping circuits, diodes are used to limit overvoltage across devices and protect switching devices from overvoltage breakdown. In rectifier circuits, diodes convert AC to DC. The D1031SH45TS02 is a power diode optimized for these high-voltage high-power applications, featuring high voltage withstand, high current, low loss, soft recovery, and high reliability.

The product's reverse repetitive peak voltage (VRRM / VDRM) reaches 4500V, suitable for DC bus voltage levels of medium-voltage (such as 3.3kV, 4.16kV, 6.6kV, etc.) variable frequency drives and inverters. It can withstand commutation overvoltage and turn-off overvoltage surges, providing sufficient voltage margin. Average forward rectified current (IFAVM) reaches 1120A (at case temperature TC=85°C), capable of conducting high current for long periods without overheating, meeting the current demand of high-power drive systems. Non-repetitive peak surge current (IFSM) reaches 23000A, capable of withstanding short-time high-current surges such as short circuits, startup inrush, and fault currents without damage, greatly improving system fault tolerance and reliability.

In terms of electrical performance, the D1031SH45TS02 adopts advanced silicon chip design and manufacturing technology. Forward voltage drop (VF) is as low as 4.2V@2500A (at maximum junction temperature), threshold voltage (VT0) is only 1.78V, slope resistance (rT) is only 0.968mΩ. These parameters mean the diode has low power loss in the conducting state, low heat generation, and high efficiency. Junction-to-case thermal resistance (RthJC) is only 10K/kW, with excellent heat dissipation performance. Combined with water-cooled or air-cooled heat sinks, it can effectively control junction temperature and ensure reliable long-term operation at rated current. Maximum junction temperature (Tvj max) reaches 140°C, with a wide operating temperature range and high temperature margin.

An important feature of this product is its soft recovery switching characteristic. During the diode reverse recovery process, the soft recovery characteristic means the fall rate (di/dt) of the reverse recovery current is relatively gentle, without violent current changes or excessive voltage spikes (L·di/dt), thereby greatly reducing commutation overvoltage and electromagnetic interference (EMI), reducing the need for snubber circuits, and improving system reliability and electromagnetic compatibility. It maintains soft turn-off characteristics even under high dv/dt conditions, suitable for high-frequency hard-switching applications. Short reverse recovery time (reference >500ns, depending on current and temperature conditions), low switching loss, suitable for medium-high frequency variable frequency drive applications.

In terms of mechanical structure, the D1031SH45TS02 adopts a 100mm diameter disc (Hockey-puck / PUK) ceramic package, with a height of only 26mm, compact structure and high power density. The disc package is a classic package form for high-power semiconductor devices, with the following advantages: ① Uniform current distribution, high chip utilization; ② Double-sided cooling (both upper and lower surfaces are electrodes, can contact heat sinks simultaneously), high cooling efficiency; ③ Press mounting, no soldering required, easy replacement; ④ Ceramic housing with good insulation performance, high mechanical strength, thermal expansion coefficient matched to silicon, high reliability. The product supports double-sided or single-sided cooling, and air or water cooling can be selected according to system design.

Press mounting is the standard installation method for disc packages. The diode is pressed between upper and lower heat sinks and clamping mechanism, ensuring good electrical and thermal contact between electrodes and heat sinks. Clamping force range is 27~45kN. During installation, a calibrated torque wrench or special clamping tool must be used to ensure the clamping force is within the specified range — too little clamping force leads to increased contact resistance, increased heat generation, and even arcing that damages the device; too much clamping force may cause ceramic housing fracture or chip damage. The product complies with international standard disc package dimensions, with good interchangeability with same-specification power diodes, thyristors, IGCTs and other devices from other brands.

The product weighs approximately 1.35kg, country of origin is Hungary (manufactured at Infineon Hungary factory, ABB branded/procured), HS code 85411000000 (semiconductor diode), complies with RoHS directive (Restriction of Hazardous Substances), environmentally compliant. The product supports IPOSIM thermal simulation (Infineon official power semiconductor simulation software), allowing engineers to accurately simulate and calculate junction temperature, loss, thermal cycle life, etc. during the system design phase, optimizing thermal design and system parameters, reducing design risk.

As a standard 配套 diode for ABB medium-voltage variable frequency drives (such as ACS6000, ACS1000 series) and IGCT power units, the D1031SH45TS02 has numerous successful application cases in various industries worldwide, with product quality and performance widely verified. Widely applied in: metallurgy mill drives, mining hoists and crusher drives, petrochemical compressor and pump drives, power industry SVG/STATCOM reactive power compensation, rail transit traction drives, marine electric propulsion, new energy grid-tie inverters, HVDC (High Voltage Direct Current) transmission and other high-power power electronic fields.

2. Specifications

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3. Key Features

1. 4500V High Voltage Withstand, 1120A High Current, High Power Density — The D1031SH45TS02 has reverse repetitive peak voltage VRRM/VDRM up to 4500V, suitable for DC bus voltage levels of 3.3kV, 4.16kV, 6.6kV medium-voltage VFDs and inverters, capable of withstanding commutation overvoltage and turn-off overvoltage surges, providing sufficient voltage margin. Average forward rectified current IFAVM up to 1120A (TC=85°C), capable of conducting high current for long periods without overheating, meeting high-power drive system current demand. Adopts 100mm disc ceramic package, height only 26mm, compact structure, high power density, ideal for medium-voltage high-power power electronic equipment.
2. 23000A High Surge Current, Strong Impact Resistance — Non-repetitive peak surge current IFSM up to 23000A, capable of withstanding short-circuit current, motor startup inrush, grid fault current, commutation failure and other short-time high-current surges without damage, greatly improving system fault tolerance and reliability. In case of VFD faults such as bridge arm shoot-through or load short circuit, the diode can withstand huge fault current for a short time, buying time for protection system action, avoiding fault escalation, an important guarantee for safe operation of high-power drive systems.
3. Low Forward Voltage Drop, Low Conduction Loss, High Efficiency — Adopts advanced silicon chip design and manufacturing technology, forward voltage drop VF as low as 4.2V@2500A (at maximum junction temperature), threshold voltage VT0 only 1.78V, slope resistance rT only 0.968mΩ. These parameters mean the diode has low power loss in conducting state, low heat generation, high efficiency. In high-power VFDs, freewheeling diode conduction loss accounts for a significant proportion of total system loss. Low forward voltage drop directly reduces system energy consumption, reduces cooling demand, improves system efficiency and reliability.
4. Soft Recovery Switching Characteristic, Low Overvoltage Low EMI — Features soft recovery switching characteristic. During reverse recovery, the fall rate (di/dt) of reverse recovery current is gentle, without violent current changes or excessive voltage spikes (L·di/dt), greatly reducing commutation overvoltage and electromagnetic interference (EMI), reducing the need for snubber circuits. Maintains soft turn-off characteristics even under high dv/dt conditions, suitable for high-frequency hard-switching applications. Soft recovery also reduces dynamic current sharing requirements for parallel devices, improving reliability of multi-device parallel operation.
5. Low Thermal Resistance, Excellent Heat Dissipation, Double-Sided Cooling — Junction-to-case thermal resistance RthJC only 10K/kW (maximum), excellent heat dissipation performance. Combined with water-cooled or air-cooled heat sinks, effectively controls junction temperature, ensuring reliable long-term operation at rated current. Disc package has electrodes on both upper and lower surfaces, supports double-sided cooling, cooling area twice that of single-sided cooled module packages, higher cooling efficiency, especially suitable for high-power density applications. Single-sided cooling also 可选 according to system design, flexible installation. Maximum junction temperature Tvj reaches 140°C, wide operating temperature range and high temperature margin.
6. 100mm Disc Ceramic Package, Press Mount, High Reliability — Adopts 100mm diameter disc ceramic package. Ceramic housing has good insulation performance, high mechanical strength, thermal expansion coefficient matched to silicon chip, effectively absorbs thermal stress from temperature cycling, high reliability. Press mounting through upper and lower heat sinks and clamping mechanism, no soldering required, low electrode contact resistance, easy replacement, suitable for power unit modular design. Clamping force range 27~45kN, ensuring good electrical and thermal contact. Complies with international standard disc package dimensions, good interchangeability with same-specification power semiconductor devices from other brands.
7. IGCT/IGBT Dedicated Freewheeling Clamping, System-Level Optimization — The D1031SH45TS02 is specifically designed for parallel freewheeling and clamping protection of IGCT and press-pack IGBT. It is system-level matched and optimized with ABB IGCT devices (such as 5SHY series) in electrical characteristics, thermal characteristics, and mechanical dimensions, ensuring optimal dynamic current sharing, commutation performance, and thermal distribution when working with IGCT/IGBT in inverter bridge arms. As freewheeling diode provides freewheeling path for inductive loads, as clamping diode limits overvoltage across switching devices, it is a core 配套 device for medium-voltage VFD power units.
8. IPOSIM Thermal Simulation Support, Convenient Design Verification — Product supports IPOSIM thermal simulation (Infineon official power semiconductor simulation software, IPOSIM-proper). Engineers can use IPOSIM software during system design phase to accurately simulate and calculate diode junction temperature, case temperature, power loss, thermal cycle life, current rating, etc., optimize thermal design and system parameters based on actual operating conditions (load profile, switching frequency, modulation method, cooling conditions, etc.), reduce design risk, shorten development cycle. IPOSIM simulation can also be used to evaluate device performance and reliability under non-rated conditions, providing data support for system selection.
9. RoHS Compliant Environmentally Friendly, Globally Widely Verified — Product complies with RoHS directive (EU Directive 2011/65/EU), free of lead, mercury, cadmium and other hazardous substances, environmentally compliant, meeting environmental regulatory requirements worldwide. As a standard 配套 diode for ABB medium-voltage VFDs and IGCT power units, it has numerous successful application cases in various industries worldwide, product quality and performance widely verified by industry. Widely applied in metallurgy mills, mining hoists, petrochemical compressors, power SVG/STATCOM, rail transit traction, marine propulsion, new energy grid-tie and other high-power fields, reliability fully verified.
10. Professional Procurement Channel, Flexible Bulk Supply — All products obtained through professional procurement channels, ensuring genuine original products, with product identification and quality documents, provides 12-month quality warranty. Supports single device procurement and bulk project orders, tiered pricing discounts with quantity. Can provide whole-station power semiconductor spare part packages (diode + IGCT + IGBT + thyristor + snubber capacitor combination) and annual spare part framework agreements. Appearance check, model confirmation, and packaging verification performed before shipment, ensuring delivered products are intact and model-accurate.

4. Typical Applications

• Medium-Voltage VFD Freewheeling Diode: In IGCT or IGBT power units of medium-voltage VFDs such as ACS6000, ACS1000, as anti-parallel freewheeling diode, provides freewheeling path for inductive load (motor) current, core device of three-phase inverter bridge arm, each phase bridge arm requires multiple diodes in parallel to meet current demand
• IGCT Clamping Protection Diode: In IGCT clamping circuit, as clamping diode with clamping capacitor and clamping resistor, limits overvoltage during IGCT turn-off, protects IGCT from overvoltage breakdown, indispensable protection device in IGCT VFDs
• Press-Pack IGBT Freewheeling Diode: In medium-voltage IGBT VFDs, as anti-parallel freewheeling diode for press-pack IGBT, packaged in the same power unit with IGBT chip, provides freewheeling for motor inductive current, ensuring inverter four-quadrant operation capability
• High-Power Rectifier: In three-phase bridge rectifier circuits, twelve-pulse rectifier circuits, twenty-four-pulse rectifier circuits, as rectifier diode converting AC to DC, applied in electrolytic aluminum, electrolytic copper, chlor-alkali chemical, HVDC and other high-voltage high-current rectification applications
• UPS Uninterruptible Power Supply: In rectifiers and inverters of high-power UPS, as rectifier diode and freewheeling diode, ensuring battery charging and inverter power supply when mains normal, battery discharge maintaining load power when mains interrupted, protecting critical loads uninterrupted
• Motor Soft Starter: In high-voltage motor soft starters, as bypass diode or rectifier diode, with thyristors achieving motor soft start and soft stop, limiting startup current, reducing impact on grid and machinery
• SVG/STATCOM Reactive Power Compensation: In chain inverters of Static Var Generator (SVG) and Static Synchronous Compensator (STATCOM), as freewheeling diode and rectifier diode, achieving dynamic reactive power regulation, improving grid power factor, stabilizing grid voltage
• DC Motor Field Supply: In DC motor field power supply, as rectifier diode converting AC to DC, providing stable DC excitation current for DC motor field winding, achieving precise control of motor speed and torque
• Water-Cooled Rectifier System: In high-power water-cooled rectifiers, double-sided cooling characteristic of disc diodes with water-cooled heat sinks achieves extremely high power density, applied in applications requiring high current and high power density, such as induction heating, plasma cutting, electrochemical power supplies
• New Energy Grid-Tie Inverter: In photovoltaic grid-tie inverters, wind power converters, energy storage converters and other new energy equipment, as rectifier diode and freewheeling diode, achieving DC to AC energy conversion and grid-tie control, improving new energy generation efficiency and power quality
• HVDC (High Voltage Direct Current) Transmission: In converter valves of HVDC systems, as converter diode with thyristors, achieving AC to DC and DC to AC conversion, core device for long-distance large-capacity power transmission
• Rail Transit Traction Drive: In traction converters of electric locomotives, EMUs, subway trains, as freewheeling diode and rectifier diode, achieving variable frequency speed regulation and braking energy feedback of traction motors, improving traction system efficiency and reliability
• Marine Electric Propulsion: In VFDs and rectifiers of marine electric propulsion systems, as power diode, achieving speed regulation control of propulsion motors and energy management of ship power grid, improving ship propulsion efficiency and fuel economy
• Induction Heating Power Supply: In medium-frequency, high-frequency induction heating power supplies, as rectifier diode and freewheeling diode, with IGBT or thyristors achieving power control of induction heating, applied in metal melting, quenching, through heating, welding and other heat treatment processes
• Plasma Cutting and Welding Power Supply: In power supplies of plasma cutters and welding machines, as rectifier diode and freewheeling diode, achieving precise control of welding current and cutting current, improving welding and cutting quality
• Test and Measurement Equipment: In high-power test power supplies, motor test benches, battery test systems and other equipment, as power diode achieving rectification and freewheeling of DC power supply, meeting test equipment requirements for power accuracy and reliability
• Power Electronic Transformer (PET): In solid-state transformers/power electronic transformers, as high-frequency rectifier diode and freewheeling diode, achieving voltage transformation, electrical isolation and power quality management, core equipment of future smart grids
• Spare Part Replacement and System Maintenance: As power diode spare parts for in-service medium-voltage VFDs, rectifiers, UPS and other equipment, used for faulty device replacement and system maintenance, ensuring continuous reliable equipment operation, reducing downtime

5. Model Explanation

ABB Part No.: 3BHB006457R0001

Product Model: D1031SH45TS02 (base model D1031SH45T)

Product Description: Power Diode, Fast Recovery Clamping Diode, 4500V, 1120A, 100mm Disc Package, Press Mount, for IGCT/IGBT Freewheeling and Clamping

Model Code Breakdown D1031SH45TS02:

表格

ABB Part No. Explanation:

• 3BHB006457R0001 is ABB standard part number format
• 3BHB: ABB product category code (power semiconductor/drive products)
• 006457: Product sequence number
• R0001: Revision 0001, hardware revision

Key Parameters Summary:

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Related Models in Same Series (reference):

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Compatible IGCT/IGBT Devices (reference):

• ABB 5SHY series IGCT (such as 5SHY35L4510, 5SHY40L4510, etc.)
• ABB 5SNA series press-pack IGBT
• Snubber capacitors (such as 3BHB009946R0001 IGCT snubber capacitor)

Brand: ABB (ASEA Brown Boveri), global leading industrial automation and power technology company; chip manufactured by Infineon

Official Documentation:

• D1031SH45T Datasheet
• IGCT Application Note
• Power Semiconductor Mounting Instructions
• IPOSIM Simulation Software

6. Installation & Usage Instructions

Pre-Installation Preparation:

• Confirm product model (D1031SH45TS02) and part number (3BHB006457R0001) match design requirements
• Confirm diode electrical parameters (voltage, current, recovery characteristic) match system design
• Inspect product appearance: ceramic housing no cracks/damage, electrode surface no oxidation/scratches/dents, ensure product intact
• Prepare installation tools: torque wrench (or special clamping force tool), multimeter, insulation resistance tester, thermocouple thermometer, etc.
• Prepare heat sinks: water-cooled or air-cooled heat sinks, confirm heat sink flatness and surface roughness meet requirements
• Prepare thermal grease or thermal pad (if needed, note disc devices usually directly press-mounted, no thermal grease used)
• Prepare insulation materials: mica sheets, insulation sleeves, etc. (if needed)
• Read power diode installation manual and IGCT/IGBT power unit assembly instructions
• Confirm installation environment: clean, dry, dust-free, no corrosive gas, ambient temperature meets requirements

Installation Notes:

• Is power diode an ESD sensitive device? — High-power diodes are usually not ESD sensitive, but should still be handled carefully to avoid electrode surface contamination and mechanical damage
• Installation and removal must be performed in de-energized state, ensure DC bus capacitors fully discharged, prevent electric shock and device damage
• Wear clean gloves when handling, avoid hand sweat and grease contaminating electrode surface, affecting contact resistance and heat dissipation
• Diode two electrodes (anode and cathode) have direction requirements, must confirm correct polarity during installation — anode to positive polarity side, cathode to negative polarity side, reversed connection causes short circuit and device damage
• Disc diode polarity usually distinguished by housing markings (such as arrow, +/- symbol, color marking), carefully check polarity markings before installation
• Electrode surfaces must be kept clean, flat, free of oxide layer; if slight oxidation, can gently polish with fine sandpaper (400# or above), then clean with anhydrous alcohol
• Heat sink surfaces must be flat (flatness ≤0.02mm), clean, burr-free, ensuring good contact with diode electrodes
• Clamping force must be within specified range (27~45kN), use calibrated torque wrench or special clamping tool, strictly prohibit clamping by feel
• Too little clamping force: increased contact resistance, increased heat generation, possible arcing damaging device
• Too much clamping force: ceramic housing may fracture, chip may damage, device permanently damaged
• When multiple diodes in parallel, must ensure consistent clamping force for each device, uniform heat sink temperature, to ensure dynamic current sharing and thermal balance
• Diode should be installed at center of heat sink, ensuring uniform pressure distribution
• Avoid subjecting diode to lateral force, torsion force and impact force during installation
• Water-cooled heat sinks must confirm no water leakage, reliable water pipe connections, coolant flow and temperature meet design requirements
• Electrical test after installation: measure diode forward conduction and reverse blocking characteristics with multimeter, confirm correct polarity and normal device
• Insulation resistance test before first power-on, confirm main circuit to ground insulation good

Polarity Identification and Wiring:

• Anode (A): Current inflow end, connected to positive polarity side of circuit (such as DC bus positive, IGBT collector side)
• Cathode (K): Current outflow end, connected to negative polarity side of circuit (such as DC bus negative, IGBT emitter side)
• Disc diode polarity usually identified by:
  1. Arrow marking on housing: arrow direction is forward current direction (from anode to cathode)
  2. "+" and "-" markings on housing: "+" is anode, "-" is cathode
  3. Color marking: some models distinguish by electrode surface color (specific per product manual)
  4. Multimeter measurement: measure with multimeter diode mode, when forward conducting (reading shows), red probe is anode, black probe is cathode (note: high-power diode forward voltage drop is high, may need special instrument)
• Freewheeling diode wiring (anti-parallel to IGBT/IGCT):
  • Diode anode (A) to IGBT emitter (E) / IGCT cathode
  • Diode cathode (K) to IGBT collector (C) / IGCT anode
  • i.e., diode anti-parallel with switching device, opposite direction
• Rectifier diode wiring (three-phase bridge rectifier):
  • Common anode group: three diode anodes connected together, to DC bus negative
  • Common cathode group: three diode cathodes connected together, to DC bus positive
  • Other end of each diode to AC input phase

Heat Sink and Cooling Design:

• Cooling method selection:
  • Double-sided water cooling: highest cooling efficiency, suitable for high-power density applications, standard configuration for medium-voltage VFDs
  • Single-sided water cooling: lower cooling efficiency, suitable for structurally constrained applications
  • Air cooling: lowest cooling efficiency, suitable for low-power or intermittent operation applications
• Heat sink requirements:
  • Material: copper or aluminum (copper better thermal conductivity, suitable for high power; aluminum lightweight, low cost)
  • Flatness: ≤0.02mm (surface in contact with diode)
  • Surface roughness: Ra ≤ 0.8μm
  • Surface treatment: nickel or silver plating (prevent oxidation, reduce contact resistance)
• Water-cooled heat sink design 要点:
  • Coolant flow: calculated based on power loss, ensure outlet temperature not exceeding specified value
  • Coolant temperature: inlet temperature usually ≤35°C (specific per design)
  • Coolant type: deionized water or antifreeze (note conductivity requirement, prevent leakage)
  • Water circuit design: ensure uniform cooling for each diode, no local overheating
  • Water leakage detection: recommend installing water leakage detection sensor, timely 发现 leakage fault
• Thermal design calculation:
  • Use IPOSIM software to calculate junction temperature, case temperature, power loss based on actual operating conditions (load current, switching frequency, modulation method, ambient temperature, cooling conditions)
  • Ensure junction temperature Tvj ≤ 125°C (with margin, not exceeding maximum 140°C)
  • Ensure case temperature TC ≤ 85°C (rated current condition)
  • Evaluate thermal cycle life, ensure meeting system life requirement
• Temperature monitoring:
  • Recommend installing temperature sensors (PT100 or thermocouple) on heat sinks, real-time monitoring heat sink temperature
  • Set temperature alarm and trip thresholds, alarm or shutdown when over-temperature, protect device

Configuration & Commissioning:

1. Confirm diode installed in place, clamping force meets requirement, polarity correct
2. Confirm heat sink installed in place, water cooling system no leakage, flow normal
3. Confirm main circuit wiring correct, no short circuit, insulation good
4. Measure diode forward voltage drop and reverse leakage current with multimeter, confirm device normal
5. Low-voltage power-on test: first power on at low voltage (e.g., 10-20% of rated), measure diode voltage and current, confirm normal operation
6. Gradual voltage increase: gradually increase DC bus voltage, observe diode voltage and temperature, confirm no abnormality
7. No-load operation: inverter no-load operation, measure diode waveform (voltage, current), confirm normal commutation, no overvoltage
8. Load test: gradually increase load, measure diode junction temperature (estimated by case temperature and thermal resistance) and power loss, confirm within rated range
9. Full-load operation: full-load operation at least 30 minutes, monitor temperature stable, confirm no overheating
10. Dynamic test: perform acceleration/deceleration, load step, four-quadrant operation and other dynamic tests, confirm diode reliable operation under dynamic conditions
11. Fault test: simulate overcurrent, overvoltage, short circuit and other faults, confirm protection system correct action, diode not damaged
12. Record test data: voltage, current, temperature, waveform, etc., include in equipment commissioning file
13. Recommend using IPOSIM software for thermal simulation verification of actual operating conditions, ensure sufficient design margin

Usage Notes:

• Power diode rated current is value at specified case temperature (TC=85°C) and cooling conditions, actual use must ensure cooling conditions meet requirements, otherwise need derating
• Strictly prohibit exceeding maximum junction temperature (140°C) operation, overheating causes device life sharply shortened or even permanent damage
• Strictly prohibit exceeding reverse voltage (4500V) operation, overvoltage causes diode breakdown damage
• Strictly prohibit exceeding surge current rating, short circuit fault must have fast protection (such as fuse, circuit breaker, electronic protection) cutting fault before device damage
• When diodes in parallel, must pay attention to dynamic and static current sharing, recommend using same model, same batch devices, ensure parameter consistency
• Stray inductance of commutation loop must be minimized, stray inductance causes increased commutation overvoltage, damaging diode and switching devices
• Snubber circuit design must be reasonable, soft recovery diodes can reduce snubber demand, but in high-voltage high-current applications may still need snubber circuit
• Regularly check clamping force: after long-term operation, clamping force may relax due to thermal cycling and mechanical creep, recommend regular check and re-tightening
• Regularly check heat sinks: water-cooled heat sinks may scale, air-cooled heat sinks may accumulate dust, affecting cooling efficiency, recommend regular cleaning
• Regularly check temperature: monitor heat sink temperature and ambient temperature, confirm cooling system normal
• Avoid frequent thermal cycling: thermal cycling is one of main causes of power semiconductor failure, should minimize unnecessary start-stop and load steps
• Storage conditions: long-term storage should be in dry, normal temperature, no corrosive gas environment, electrode surfaces should be protected from oxidation
• Discarded power diodes should be disposed of per e-waste regulations, contain heavy metals and hazardous substances, not 随意 discarded

Maintenance Recommendations:

• Daily inspection: Monitor heat sink temperature, coolant flow and temperature, ambient temperature, listen for abnormal sounds
• Monthly check: Check water cooling system for leakage/scaling, air-cooled heat sink for dust accumulation, electrical connections for looseness, clamping force for relaxation
• Quarterly maintenance: Clean heat sinks, check diode electrode surfaces for oxidation/discoloration, measure insulation resistance, check temperature sensor calibration
• Annual calibration: Perform comprehensive electrical test (forward voltage drop, reverse leakage current), thermal imaging check temperature distribution, evaluate device aging status, replace if necessary
• Life management: Record operating hours, thermal cycle count, fault count, based on IPOSIM life evaluation and actual operating data, replace before life expiration
• Spare parts: Recommend stocking appropriate quantity of same model diodes as spare parts for quick replacement in case of failure
• When replacing device, must use same model or safety-assessed compatible model, after replacement re-test clamping force and electrical performance

Safety Notes:

• Power diodes operate in high-voltage (thousands of volts) high-current (thousands of amperes) environments, installation, maintenance, replacement must be performed by qualified high-voltage electrician professionals
• Before operation, must power off, test voltage, discharge (DC bus capacitors may store large charge, voltage may reach thousands of volts), confirm no voltage before operation
• Wear personal protective equipment such as insulated gloves, goggles, use insulated tools
• During high-voltage testing, must set up safety fences and warning signs, prohibit unauthorized personnel from entering
• Water cooling system leakage may cause high-voltage short circuit and electric shock, must ensure water cooling system well-sealed, regular check
• Diode damage (breakdown short circuit) may cause DC bus short circuit, generating huge short-circuit current and arc, must have fast protection device
• When replacing damaged diode, must check damage cause (overvoltage, overcurrent, overheating, poor cooling, abnormal clamping force, etc.), eliminate fault root cause before replacing new device, otherwise new device may damage again
• When multiple diodes in parallel, one device damage may cause current concentration to other devices, triggering cascading damage, must comprehensively check all parallel devices
• Avoid outdoor high-voltage equipment maintenance and testing during thunderstorms
• Discarded power diodes contain heavy metals (lead, etc.) and ceramic materials, should be disposed of per hazardous waste regulations, not 随意 discarded or incinerated

7. Why Choose Us

1. Professional Procurement Channel, Quality Guaranteed — All products obtained through professional procurement channels, ensuring genuine original products, with product identification and quality documents, provides 12-month quality warranty. Appearance check (ceramic housing no cracks, electrode surface no oxidation/damage), model confirmation, part number verification, and packaging verification performed before shipment, ensuring delivered products are intact and model-accurate.
2. Worldwide Delivery — Supports DHL, FedEx, UPS and other international couriers. Can also ship via your designated freight forwarder to 200+ countries, can arrange project site delivery and port delivery. Power semiconductor devices use shock-proof, moisture-proof, anti-static professional packaging, disc devices fixed with special foam, ensuring transportation safety, avoiding electrode surface damage and ceramic housing fracture.
3. Professional Technical Support — Provides selection consultation (confirming voltage level, current rating, recovery characteristic, package dimensions, compatible IGCT/IGBT model matching), installation guidance (clamping force control, polarity identification, heat sink design, water cooling system configuration), thermal simulation support (IPOSIM software usage guidance, junction temperature calculation, cooling optimization), fault diagnosis (overvoltage breakdown, overcurrent damage, overheating failure cause analysis) and spare part replacement suggestions, helping you correctly select and successfully commission high-power drive systems.
4. Flexible Procurement — Supports single device procurement and bulk project orders, tiered pricing discounts with quantity. Can provide whole-station power semiconductor spare part packages (diode + IGCT + IGBT + thyristor + snubber capacitor + driver board combination) and annual spare part framework agreements. For VFD power unit 整体 replacement needs, can provide power unit-level 配套 supply and technical support.
5. Pre-shipment Inspection — Appearance check, packaging verification, model confirmation, part number verification performed before shipment. Electrical parameter test reports (forward voltage drop, reverse leakage current, etc.) can be provided if necessary, ensuring delivered products have accurate models and qualified performance.

8. Frequently Asked Questions (FAQ)

Q1: What is this 3BHB006457R0001 product? What functions does it have?

A: 3BHB006457R0001 is an ABB power diode, model D1031SH45TS02, a high-voltage high-current fast recovery clamping diode, mainly used in high-power power electronic equipment.

Main functions:

• Freewheeling Diode: Anti-parallel across IGBT or IGCT switching devices, provides freewheeling path for inductive load (such as motor) current. When switching device turns off, inductive load current cannot change abruptly, continues flowing through freewheeling diode, avoiding overvoltage breakdown of switching device
• Clamping Diode: In IGCT clamping circuit, with clamping capacitor and clamping resistor, limits overvoltage during IGCT turn-off, protects IGCT from overvoltage breakdown
• Rectifier Diode: In rectifier circuits converts AC to DC, applied in rectifier power supplies, battery charging, DC motor field excitation, etc.

Key parameters:

• Reverse voltage VRRM/VDRM: 4500V
• Average forward current IFAVM: 1120A (TC=85°C), commonly rated 1000A
• Surge current IFSM: 23000A
• Maximum junction temperature Tvj: 140°C
• Forward voltage drop VF: 4.2V@2500A
• Recovery characteristic: Soft Recovery
• Package: 100mm disc ceramic package, height 26mm
• Mounting: Press mount, clamping force 27~45kN
• Cooling: Double-sided/single-sided cooling
• Weight: Approx. 1.35kg
• Country of origin: Hungary

Simply put: This is a high-power diode with 4500V voltage withstand and 1120A current capability, disc shape like a large button, press-mounted between heat sinks. Mainly used in medium-voltage VFDs, anti-parallel with IGBT/IGCT switching devices, providing "freewheeling" path for motor current, or used to limit overvoltage protecting switching devices. It is a core power device in high-power drive equipment.

Q2: What is the difference between this diode and ordinary diodes? Why is it so big? What does soft recovery mean?

A: The D1031SH45TS02 is a high-power fast recovery soft recovery diode, very different from ordinary small-signal diodes and ordinary rectifier diodes:

Difference from ordinary small-signal diodes:

表格

Difference from ordinary rectifier diodes:

• Recovery speed: Ordinary rectifier diodes (such as power frequency rectifier tubes) have long reverse recovery time (several microseconds to tens of microseconds), only suitable for power frequency (50/60Hz) rectification; D1031SH45TS02 is fast recovery diode, short reverse recovery time (sub-microsecond), suitable for medium-high frequency (hundreds of Hz to several kHz) switching applications in VFDs
• Recovery characteristic: Ordinary rectifier diodes are hard recovery, reverse recovery current falls fast, large di/dt, generates high overvoltage and strong EMI; D1031SH45TS02 is soft recovery, reverse recovery current falls gently, small di/dt, low overvoltage and EMI
• Application: Ordinary rectifier diodes used in uncontrolled rectification (such as power rectifier bridges); fast recovery soft recovery diodes used in inverter freewheeling, high-frequency rectification, active inversion and other applications requiring fast switching and low overvoltage

Why is it so big?

• High current requires large chip area: 1120A current requires very large silicon chip area, chip diameter close to 100mm
• High voltage requires thick chip: 4500V voltage withstand requires very thick silicon wafer (hundreds of microns) to withstand reverse voltage
• High power loss requires large cooling area: Conduction loss at high current is large (4.2V×1120A≈4.7kW), requires large cooling area and efficient cooling
• Disc package suitable for high power: Disc package has uniform current distribution, double-sided cooling, reliable press mounting, standard package form for kiloampere-level power devices
• Ceramic housing insulation and mechanical strength: Ceramic housing provides high insulation strength and mechanical strength, withstands thermal cycling stress

What does soft recovery mean?

• The process of diode switching from conducting to blocking is called "reverse recovery" — during forward conduction, large number of carriers are stored in the diode, during turn-off these carriers need to be extracted or recombined, forming reverse recovery current
• Hard Recovery: Reverse recovery current suddenly drops to zero, large di/dt, according to V=L・di/dt, generates high voltage spike on loop stray inductance, may breakdown device, 同时 generates strong EMI
• Soft Recovery: Through special silicon chip design (such as local lifetime control, field stop structure, etc.), makes reverse recovery current fall rate gentle, small di/dt, low voltage spike, low EMI
• Benefits of soft recovery:
  1. Reduces commutation overvoltage, protects switching devices from overvoltage breakdown
  2. Reduces electromagnetic interference (EMI), simplifies EMC design
  3. Reduces or eliminates snubber circuits, reduces cost and complexity
  4. Reduces switching loss, improves system efficiency
  5. Improves dynamic current sharing performance of parallel devices
• D1031SH45TS02 soft recovery characteristic maintained even under high dv/dt conditions, especially suitable for hard-switching applications of IGCT and IGBT VFDs

Q3: How to install this diode? What does clamping force 27~45kN mean? How to distinguish polarity?

A: The D1031SH45TS02 adopts press mounting, the diode is pressed between upper and lower heat sinks and clamping mechanism.

Installation steps:

1. Preparation: Confirm diode model, polarity, appearance intact; prepare heat sinks (water/air cooled), clamping mechanism, torque wrench (calibrated), insulation materials, etc.
2. Clean surfaces: Clean diode electrode surfaces and heat sink surfaces with anhydrous alcohol, ensure no grease, dust, oxide layer
3. Place diode: Place diode at center of lower heat sink, note polarity direction (anode/cathode orientation correct)
4. Place upper heat sink: Align upper heat sink with diode center, gently lower, avoid sliding scratching electrode surface
5. Install clamping mechanism: Install clamping bolts or special clamping device, ensure pressure uniformly distributed at diode center
6. Apply clamping force: Use calibrated torque wrench or special clamping force tool, gradually and symmetrically tighten clamping bolts until clamping force reaches specified value within 27~45kN range (usually take intermediate value approx. 35kN, specific per power unit design requirements)
7. Check installation: Confirm diode centered, pressure uniform, no tilting, no lateral force
8. Electrical test: Measure forward conduction and reverse blocking with multimeter, confirm correct polarity and normal device

What does clamping force 27~45kN mean?

• 27kN ≈ 2.75 ton-force
• 45kN ≈ 4.59 ton-force
• That is, need 2.75 to 4.59 tons of force to press this "disc" between two heat sinks
• Such large clamping force is to ensure:
  1. Contact resistance between electrode and heat sink sufficiently small (below milliohm level), reducing contact loss and heat generation
  2. Good thermal contact, ensuring chip heat efficiently conducted to heat sink
  3. Stable contact under high current and thermal cycling, no arcing or poor contact
• Clamping force control is critical:
  • Too little clamping force (<27kN): increased contact resistance, increased heat generation, possible arcing, burning electrode surface, leading to device failure
  • Too much clamping force (>45kN): ceramic housing may fracture, silicon chip may damage, device permanently damaged
• Must use calibrated torque wrench or special hydraulic clamping tool, strictly prohibit tightening by feel
• When multiple diodes in parallel, clamping force of each device must be consistent (error ≤5%), to ensure current sharing and thermal balance

How to distinguish polarity?

• Anode (A): Current inflow end, connected to positive polarity side
• Cathode (K): Current outflow end, connected to negative polarity side
• Identification methods:
  1. Housing marking: Disc diode housing usually has arrow marking, arrow direction is forward current direction (from anode to cathode); or has "+"/"-" marking, "+" is anode, "-" is cathode
  2. Color marking: Some models have color distinction on electrode surfaces (specific per product manual)
  3. Multimeter measurement: Measure with multimeter diode mode, when forward conducting (voltage drop reading), red probe is anode, black probe is cathode; reverse blocking (reading infinity or overload)
  4. Reference assembly drawing: In power unit assembly drawing, diode polarity and installation direction usually clearly marked, install per drawing
• Note: High-power diode forward voltage drop is relatively high (approx. 1.5-4V), ordinary multimeter diode mode test voltage may not be sufficient to fully conduct, recommend using dedicated diode tester or high-current test method to confirm polarity and performance
• Consequence of reversed connection: If polarity reversed, diode is equivalent to forward conducting in circuit, causing DC bus short circuit, generating huge short-circuit current, burning diode and other devices, must pay special attention!

Q4: Where is this diode used? What is its relationship with IGCT? What happens if it fails?

A: The D1031SH45TS02 is mainly used in medium-voltage high-power VFDs, inverters, rectifiers and other power electronic equipment, especially as 配套 freewheeling and clamping diode for IGCT (Integrated Gate-Commutated Thyristor).

Main application scenarios:

1. Medium-voltage VFDs (such as ABB ACS6000, ACS1000 series): In three-phase inverter bridge arms, each IGCT has an anti-parallel freewheeling diode, providing freewheeling path for motor inductive current; 同时 as clamping diode in IGCT clamping circuit limiting overvoltage
2. IGBT medium-voltage VFDs: Anti-parallel freewheeling diode for press-pack IGBT
3. High-power rectifiers: Electrolytic aluminum, electrolytic copper, chlor-alkali chemical and other high-voltage high-current rectification
4. UPS uninterruptible power supplies: Rectification and freewheeling in high-power UPS
5. SVG/STATCOM reactive power compensation: Freewheeling and rectification in chain inverters
6. Motor soft starters: Bypass and rectification
7. New energy grid-tie inverters: Photovoltaic, wind power converters
8. HVDC (High Voltage Direct Current) transmission: Converter valves
9. Rail transit traction: Traction converters
10. Marine electric propulsion: Propulsion VFDs

Relationship with IGCT:

• IGCT (Integrated Gate-Commutated Thyristor) is a high-power switching device commonly used in medium-voltage VFDs, combining GTO's high voltage high current and IGBT's fast switching
• In voltage source inverters, IGCT as switching device controls energy flow from DC bus to motor
• Since motor is inductive load, current cannot change abruptly, when IGCT turns off, motor current needs a freewheeling path — this is the role of freewheeling diode
• Each IGCT requires an anti-parallel freewheeling diode: When IGCT conducts, current flows through IGCT; when IGCT turns off, current flows through freewheeling diode, 二者 alternate operation
• The D1031SH45TS02 is the freewheeling diode used with ABB IGCTs (such as 5SHY series), system-level matched in electrical characteristics, thermal characteristics, mechanical dimensions
• Additionally, in IGCT clamping circuit (RCD clamp), diode also serves as clamping diode, with clamping capacitor and resistor, limiting IGCT turn-off overvoltage
• Simple analogy: IGCT like a "high-speed switch" controlling current on/off, diode like a "one-way valve" allowing current to freewheel through another path during turn-off, 二者 cooperate to normally drive motor

What happens if it fails? Power diode failure usually has the following modes and consequences:

1. Breakdown short circuit (most common):
   • Causes: Overvoltage (commutation overvoltage, lightning, switching overvoltage), overheating (poor cooling, overload), overcurrent (short circuit)
   • Phenomenon: Diode anode and cathode shorted, loses unidirectional conductivity
   • Consequences:
     • If freewheeling diode breakdown short circuit, causes DC bus positive and negative short circuit through IGBT and diode, generating huge short-circuit current (may reach tens of kiloamperes)
     • Short-circuit current burns IGBT, diode, fuses, bus bars, even causes arc and fire
     • VFD immediately trips and shuts down, in severe cases entire power unit scrapped, requires replacing multiple devices
     • May cause production interruption, huge economic loss
2. Open circuit failure:
   • Causes: Poor electrode contact, bond wire fuse, chip crack
   • Phenomenon: Diode completely non-conducting, no current even in forward direction
   • Consequences:
     • If freewheeling diode open circuit, when IGBT turns off, motor inductive current has no freewheeling path, generates extremely high overvoltage (L·di/dt), breakdown IGBT and other devices
     • Motor current intermittent, torque fluctuation, increased vibration and noise
     • May lead to IGBT overvoltage breakdown, triggering larger fault
3. Performance degradation (increased leakage, elevated voltage drop):
   • Causes: Long-term aging, thermal cycle fatigue, chip damage
   • Phenomenon: Reverse leakage current increases, forward voltage drop rises, increased loss
   • Consequences:
     • Increased device heating, elevated junction temperature, accelerated aging, forming vicious cycle
     • May eventually develop into breakdown short circuit
     • Deteriorated current sharing among parallel devices, individual device overcurrent
4. Mechanical damage (ceramic fracture):
   • Causes: Excessive clamping force, thermal shock, mechanical vibration, improper installation
   • Phenomenon: Ceramic housing cracks, gas leakage, chip exposed
   • Consequences: Insulation failure, may cause ground short circuit or phase-to-phase short circuit

Protection measures:

• Fast fuses: Series fast fuse in each bridge arm, quickly blows during short circuit, isolating fault
• Overvoltage protection: RC snubber, MOV (varistor), clamping circuit
• Overcurrent protection: Electronic overcurrent protection, short circuit protection, microsecond-level response time
• Overheating protection: Temperature sensors monitoring heat sink temperature, over-temperature alarm and trip
• DC bus overvoltage protection: Brake chopper, overvoltage trip
• Regular maintenance: Regularly check device status, temperature, clamping force, early detection of degraded devices

Q5: Is this product in stock? What is the lead time? What is the price?

A: This model is currently in order available status, standard lead time 4-8 weeks (ordered through professional procurement channels or allocated from global inventory). The D1031SH45TS02 is a commonly used 配套 power diode for medium-voltage VFDs and IGCT power units with large usage, but belongs to high-power semiconductor devices with long production cycle, specific inventory situation fluctuates with market.

• Price: Specific price subject to our formal quotation, price depends on purchase quantity, supply channel, whether includes technical service and other factors. High-power disc diodes are high-value power semiconductor devices, unit price relatively high (usually at thousands of RMB level), bulk procurement can enjoy tiered discounts.
• Expedited service: If you have urgent needs (such as VFD fault emergency repair, urgent project commissioning, tight schedule), we can try to coordinate global stock inventory or expedited ordering, specific please contact our sales team.
• Please indicate required quantity, compatible VFD model (such as ACS6000/ACS1000), compatible IGCT model, project name, desired delivery time, and destination when inquiring, we will do our best to coordinate the fastest delivery solution and optimal price.
• If you need to purchase compatible IGCTs (5SHY series), snubber capacitors, driver boards, heat sinks and other power unit components simultaneously, we can provide power unit-level combined quotation with more favorable prices.

Q6: How to judge if a power diode is good or bad? What to 注意 when replacing? Does it need re-testing?

A: Power diode good/bad judgment and replacement precautions as follows:

Good/bad judgment methods:

1. Appearance inspection (preliminary judgment):
   • Ceramic housing: any cracks, damage, discoloration (overheating causes ceramic discoloration)
   • Electrode surface: any oxidation, erosion, melting, dents (overcurrent or poor contact causes electrode erosion)
   • Any arc burn marks
   • Any coolant leakage traces (water-cooled heat sink leakage may cause device damage)
   • If appearance has obvious abnormality, device is likely damaged
2. Multimeter measurement (offline test):
   • Remove diode from circuit (or at least disconnect one end), ensure not affected by parallel circuit
   • Measure with multimeter diode mode (or resistance mode):
     • Forward measurement: Red probe to anode, black probe to cathode, should have reading (high-power diode forward voltage drop approx. 1.5-4V, ordinary multimeter may show "overload" or partial reading due to small test current)
     • Reverse measurement: Red probe to cathode, black probe to anode, should show infinity (blocking)
     • If both forward and reverse conducting (small reading), indicates breakdown short circuit
     • If both forward and reverse blocking (infinity), indicates open circuit failure
   • Note: High-power diode chip area is large, junction capacitance is large, when measuring with pointer multimeter resistance mode, forward may have charging phenomenon, need wait for reading stable
3. Dedicated instrument test (accurate test):
   • Use diode tester or thyristor tester, can measure:
     • Forward voltage drop VF (at specified forward current, such as 100A, 500A, 1000A)
     • Reverse leakage current IR (at specified reverse voltage, such as 4500V)
     • Reverse breakdown voltage VBR
     • Reverse recovery time trr and recovery charge Qrr
   • Compare with typical values in product datasheet, judge if device is degraded or damaged
   • This is the most accurate test method, recommended during important equipment maintenance
4. Online test (operating status judgment):
   • Infrared thermal imaging: During equipment operation, use infrared thermal imager to measure diode and heat sink temperature, normally temperature of each parallel device should be uniform (temperature difference ≤5-10°C), if a device temperature is significantly higher, may be degraded or poor contact
   • Voltage waveform measurement: Use high-voltage oscilloscope to measure voltage waveform across diode, normal freewheeling diode voltage waveform should be complementary to switching device, no abnormal overvoltage spike
   • Current measurement: Use Rogowski coil or current transformer to measure diode current, confirm uniform current distribution
   • Temperature monitoring: Through temperature sensors on heat sinks, monitor each power unit temperature whether balanced
5. Insulation resistance test:
   • Use insulation resistance tester (megohmmeter) to measure insulation resistance of diode electrodes to ground (heat sink), normally should be greater than several hundred megaohms
   • If insulation resistance is low, may be ceramic housing fracture, coolant leakage or contamination

Replacement precautions:

1. Before replacement:
   • Must power off, test voltage, discharge (DC bus capacitors may store large charge, voltage may reach thousands of volts)
   • Confirm fault cause: Check if damage caused by overvoltage, overcurrent, overheating, poor cooling, abnormal clamping force or device aging, must eliminate fault root cause, otherwise new device may damage again
   • Check all parallel devices: One diode breakdown short circuit may cause current concentration to other parallel devices, triggering cascading damage, must comprehensively check all parallel diodes and compatible IGCTs
   • Check heat sinks: Confirm heat sink surfaces no erosion/deformation, water-cooled heat sinks no leakage/scaling
   • Prepare same model new device: Must use D1031SH45TS02 same model, or strictly safety-assessed compatible model, not 随意 replace
   • New device inspection: Appearance check, polarity confirmation, multimeter test, ensure new device intact
2. During replacement:
   • Wear clean gloves, avoid contaminating electrode surface
   • Remove old device: Loosen clamping mechanism, take out old device, be careful not to scratch heat sink surface
   • Clean heat sink: Clean heat sink surface with anhydrous alcohol, if erosion or uneven, need polish or replace heat sink
   • Install new device: Confirm correct polarity (anode/cathode direction), place centered, install upper heat sink
   • Apply clamping force: Use calibrated torque wrench, per specified clamping force (27~45kN, usually take design value) evenly and symmetrically tighten, ensure uniform pressure
   • Electrical connections: Confirm bus bar connections reliable, torque meets requirements
   • Water cooling connections: If water-cooled, reconnect water pipes, confirm no leakage, coolant flow normal
3. After replacement (must re-test!):
   • Insulation test: Measure main circuit to ground insulation resistance, confirm good insulation
   • Multimeter test: Measure new diode forward conduction and reverse blocking, confirm correct polarity
   • Low-voltage power-on test: First power on at low voltage, measure diode voltage and current, confirm normal operation
   • Gradual voltage increase: Gradually increase DC bus voltage, observe no abnormality
   • No-load operation: Inverter no-load operation, measure diode voltage waveform, confirm normal commutation
   • Load test: Gradually increase load, use infrared thermal imager to monitor new diode and other parallel devices temperature, confirm uniform temperature, no local overheating
   • Full-load operation: Full-load operation at least 30 minutes, confirm temperature stable, no alarm
   • Record data: Record replacement date, new device identification, test data, include in equipment maintenance file
   • Recommendation: After power diode replacement, recommend enhanced temperature monitoring during initial 24-48 hours, confirm new device stable operation

Important notes:

• Power diode replacement is high-voltage electrical work, must be performed by qualified high-voltage electrician with power semiconductor experience
• After replacement must perform complete testing and trial operation, not simply replace and directly put into full-load operation
• If same power unit repeatedly experiences diode damage, must deeply investigate system cause (such as excessive stray inductance, snubber circuit failure, insufficient cooling, abnormal drive signal, etc.), cannot only replace device
• Recommend stocking appropriate quantity of same model spare parts for quick replacement in case of failure, reducing downtime