30 A fast recovery diode in D2PAK for PFC and boost stages
The STTH30R04G-TR is a 30 A, 400 V fast recovery diode from STMicroelectronics in a surface-mount D2PAK (TO-263AB) package. Its 100 ns reverse recovery time places it in the fast-recovery class, making it suitable for continuous-current-mode PFC stages, boost converters, and output rectification in switching power supplies where reverse-recovery losses matter.
Conduction and switching parametric fit
With a forward voltage of 1.45 V max at 30 A, the conduction loss at full rated current is roughly 43.5 W — the D2PAK's large copper tab on the bottom side is designed to spread that heat into the PCB's copper pour, so the thermal design must budget for the junction-to-ambient path through the board. The 15 µA reverse leakage at 400 V is low enough that standby dissipation in an offline supply stays under 6 mW. The junction temperature range spans -40°C to 175°C, which covers both cold-start in outdoor equipment and the self-heating peak inside a sealed enclosure. The 100 ns trr is specified at typical test conditions — in a hard-switching PFC stage running 50-100 kHz, the recovery charge determines the MOSFET turn-on loss, so the actual switching loss depends on the di/dt and the diode's stored charge, not just the trr number alone.