20 A, 120 V Schottky rectifier — fast recovery for switched-mode supplies
The STMicroelectronics STPS20M120STN is a 20 A, 120 V Schottky rectifier in a TO-220AB through-hole package, specified for fast recovery (<500 ns at >200 mA). It is designed for high-frequency rectification in switch-mode power supplies, freewheeling diodes, and polarity protection where low forward voltage and fast switching are needed. The 840 mV forward drop at the full 20 A rating keeps conduction losses manageable in a single-device TO-220 footprint.
STMicroelectronics lists the STPS20M120STN as Obsolete. No direct successor is published in the available records. Buyers should evaluate alternative Schottky rectifiers in the same current and voltage class for new designs.
Thermal and mechanical — what the TO-220AB package demands
The TO-220AB narrow-lead package (ST's TO-220AB Narrow Leads variant) is a through-hole, single-diode footprint with the anode on the tab. The 275 µA reverse leakage at 120 V is a room-temperature figure; leakage doubles roughly every 10°C above 25°C, so derate the junction temperature budget for high-ambient enclosures.