Obsolete — last-time-buy window is closed
STMicroelectronics lists the STPS40SM120CR as Obsolete. The official last-time-buy window has passed, so new inventory comes from independent distribution channels — not the factory. ROHS3 compliant, so the part still meets current environmental requirements for repair or legacy production runs.
120 V, 20 A per diode — common cathode pair
The common-cathode configuration means the two Schottky diodes share the cathode connection — a standard topology for center-tapped secondary rectification in switch-mode power supplies. Forward voltage drop is 830 mV max at 20 A, which sets the conduction loss floor in the thermal budget. Reverse leakage is 275 µA at 120 V — a figure that rises with junction temperature, so heatsinking matters in continuous high-current duty.
Fast recovery Schottky — ≤500 ns
Classified as Fast Recovery ≤500 ns, >200 mA. While Schottky diodes inherently switch faster than this threshold, the rating confirms suitability for power-supply output rectification in the 50–100 kHz range where reverse-recovery losses are negligible.
TO-262 I2PAK — through-hole power package
Through-hole mounting in a TO-262-3 long-lead I2PAK. Junction temperature limit is 150°C max.