What this 1200 V Trench Field Stop IGBT is for
The STGW40M120DF3 is a 1200 V, 80 A continuous (160 A pulsed) Trench Field Stop IGBT from STMicroelectronics in a TO-247-3 through-hole package. The Trench Field Stop structure gives a lower on-state voltage drop and faster switching than planar or non-punch-through types — the Vce(on) is 2.3 V typical at 15 V gate drive and 40 A collector current. With a 125 nC total gate charge and switching energies of 1.5 mJ on and 2.25 mJ off at 600 V, 40 A, it is sized for hard-switching applications in the 5–20 kHz range.
The junction temperature range is -55°C to 175°C, which covers military and high-reliability industrial environments — motor drives in engine bays, solar inverters in desert installs, and traction converters where the die sees repeated thermal cycling from cold start to full load. The 175°C Tj(max) gives headroom above the usual 150°C industrial limit, so the thermal design can push closer to the rated 468 W power dissipation without derating prematurely.
Switching performance at the test condition
Tested at 600 V bus, 40 A collector, 10 Ohm gate resistor, and 15 V gate drive — this is a realistic hard-switching inverter leg condition. The turn-on delay is 35 ns and turn-off delay is 140 ns at 25°C. The reverse recovery time of the internal diode is 355 ns. For a 20 kHz PWM cycle, the switching losses per pulse (1.5 mJ on, 2.25 mJ off) add up to about 75 W of switching loss at that frequency — the designer needs to budget that against the 468 W package limit and the junction temperature rise.
Package, mounting, and compliance
TO-247-3 through-hole — three leads, large tab for heatsink mounting. The package suits bolted-down power stages where vibration and thermal cycling are present; the through-hole leads handle the mechanical stress better than surface-mount in high-current layouts. ROHS3 compliant per.
Lifecycle and sourcing posture
No official second-source or pin-compatible alternate is listed in the manufacturer cross-reference data.