200 V, 4 A fast recovery — the 30 ns trr is the gate
The STTH4R02U is a standard fast recovery diode from STMicroelectronics, rated for 200 V reverse voltage and 4 A average rectified current. Its 30 ns reverse recovery time (trr) places it in the fast-recovery class for switching power supplies where the diode's turn-off speed directly sets the snubber loss and ringing amplitude.
Forward drop and thermal budget at 4 A
Maximum forward voltage is 1.05 V at 4 A, which at full rated current gives a conduction loss of about 4.2 W before any derating.
Active production, ROHS3, SMB footprint
No LTB notice or successor has been published — the part is a standard catalog item for ongoing designs.