How to find the right IGBT Transistors AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in IGBT Transistors
- Collector-emitter voltage (Vces)
- Use 600–650 V parts for equipment on 120–240 V single-phase mains, and 1200 V parts for 400–480 V three-phase or for resonant circuits such as induction heaters The rectified DC bus plus switching overshoot must stay safely below the rating.
- Current rating at real case temperature
- Size by the datasheet collector current at 100 °C case temperature, not the 25 °C headline figure Usable current falls sharply when the device is hot, and the headline figure assumes an unrealistically cool case.
- Co-packaged diode
- Choose a part with an anti-parallel freewheeling diode for half-bridges, inverters and inductive loads, unless the circuit provides a separate diode Without that diode the inductive current has no path at turn-off and the IGBT can be destroyed.
- Gate drive
- Drive the gate at about +15 V to turn on, and use 0 V or a negative off-voltage for high-power and module parts Too little gate voltage raises Vce(sat) and losses, and a gate held only at 0 V can turn on falsely through Miller coupling.
- Switching speed vs conduction loss
- Compare Vce(sat) and turn-off energy with the circuit's switching frequency, and match the original part's speed class when replacing Fast IGBTs trade higher conduction loss for lower switching loss, so the wrong class overheats in a given circuit.
- Short-circuit withstand
- For motor drives, check that the datasheet specifies a short-circuit withstand time Desaturation protection needs the device to survive a fault for a few microseconds until the driver shuts it off.
Brands that matter
- Infineon: Widest discrete and module IGBT range (TRENCHSTOP discretes, EconoDUAL modules) and the reference for many appliance replacements.
- onsemi: Large discrete IGBT range including field-stop parts used in welders and induction cookers.
- STMicroelectronics: Discrete IGBTs across 600 V and 1200 V classes.
- Mitsubishi Electric: Industrial IGBT modules and intelligent power modules for drives.
- Fuji Electric: Industrial IGBT modules common in inverters and UPS units.
- Semikron Danfoss: Power modules for industrial drives and converters.
- Littelfuse (IXYS): High-voltage discrete and module IGBTs.
- Toshiba: Discrete IGBTs used in appliance and induction-heating repair.
What to avoid
- Cheap multi-packs of popular induction-cooker and welder IGBT part numbers from unknown sellers, which are frequently relabeled or remarked counterfeits
- Replacing a part with one that has a lower voltage class or lacks the co-packaged diode the original had
- Reusing a failed IGBT's gate resistor or driver without checking it, since a shorted IGBT often damages them too
- Mounting without thermal interface material or the correct insulating pad on TO-247 parts
Questions
Can I replace an IGBT with a MOSFET of the same voltage and current?
Not as a drop-in. The two have different conduction behavior, gate charge and diode characteristics, so a substitute must be checked against the circuit's frequency, voltage and driver.