Dual Schottky in a single TO-220
The STPS30120CT packs two 120 V Schottky diodes in a common-cathode pair inside a standard TO-220 through-hole package. Each diode handles 15 A average rectified current, making the array suitable for 30 A output stages where two paralleled Schottkys would otherwise take up separate footprints. Forward voltage is 920 mV maximum at 15 A — the conduction loss per diode at full load is roughly 13.8 W, so the TO-220 tab needs a heatsink rated for the combined thermal load of both junctions. The 175°C maximum junction temperature gives headroom for high-ambient power supplies and motor-drive output rectifiers.
Switching speed and leakage profile
Rated as a fast-recovery Schottky (recovery time under 500 ns above 200 mA), the STPS30120CT is suited for switched-mode power supply secondary-side rectification and freewheeling diodes in inverter legs. The Schottky barrier eliminates stored charge, so the reverse-recovery losses that plague ultrafast PN diodes at high frequency are absent. Reverse leakage is 15 µA at the 120 V rated voltage — low enough for continuous conduction in a 100 V rail, but the leakage doubles roughly every 10°C junction rise, so at 125°C the standby loss should be factored into the thermal budget.
STMicroelectronics lists the STPS30120CT as an active product with RoHS3 compliance (2011/65/EU + 2015/863).