20 A Schottky for output rectification and OR-ing
The STPS20SM100ST is a 100 V, 20 A Schottky rectifier in a TO-220 through-hole package, built for continuous conduction in power supplies, PFC stages, and reverse-polarity protection circuits where the forward drop drives the thermal budget.
Fast recovery and leakage at 100 V
Listed as fast recovery with a recovery time under 500 ns at currents above 200 mA, which suits hard-switched topologies like flyback or forward converters where reverse-recovery charge would otherwise spike the switching loss. Reverse leakage is 30 µA at the 100 V rated reverse voltage — a typical Schottky trade-off: the leakage rises with junction temperature, so the 150°C maximum junction rating sets the practical derating for high-ambient or low-airflow enclosures.