Component reference
Welder MOSFET GTR IGBT Comparison
Power devices are not interchangeable by package shape alone. Driver requirements and diode behavior matter.
Component role
Use this page when comparing older GTR stages, MOSFET supplies and IGBT inverter modules. The replacement decision must include voltage, current, driver and thermal evidence.
Repair evidence table
| Device | Repair focus | Warning |
|---|---|---|
| MOSFET | Gate charge, voltage rating, fast switching | Common in smaller supplies and auxiliary circuits. |
| GTR | Base drive current and older driver circuits | Not a drop-in replacement for IGBT/MOSFET stages. |
| IGBT | Gate drive, anti-parallel diode, module layout | Common in inverter welders; check driver before replacement. |