650 V, 120 A Trench Field Stop IGBT — switching-loss budget
The STGWA80H65FB is a 650 V, 120 A Trench Field Stop IGBT from STMicroelectronics in a TO-247-3 Long Leads package. It targets hard-switching applications such as motor drives, inverters, and power supplies where the 650 V breakdown and 120 A continuous collector current set the bus-voltage and load-current ceiling. The Trench Field Stop structure gives a low saturation voltage of 2 V at 15 V gate drive and 80 A, which directly reduces conduction loss in the on-state.
Switching energy and gate drive demand
Switching losses are characterised at 400 V, 80 A, 10 Ω gate resistor, and 15 V gate drive: 2.1 mJ turn-on and 1.5 mJ turn-off. At a 20 kHz switching frequency, the total switching loss at those conditions is roughly 72 W — a number that must be factored into the heatsink design alongside the 469 W maximum power dissipation. The 414 nC total gate charge means the gate driver must source about 8.3 mA average current at 20 kHz; a driver with insufficient peak current will stretch the switching times and increase loss.
Temperature range and package considerations
The TO-247-3 Long Leads package is a through-hole mount that simplifies heatsinking — the large tab area provides a low thermal resistance path to the heatsink. The 240 A pulsed collector current rating gives headroom for inrush and short-circuit events, but the SOA must be checked against the actual switching trajectory at the operating junction temperature.