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STMicroelectronics STPS40SM100CG — Discrete Semiconductors

STPS40SM100CG Schottky Diode, 100V 20A Dual Common Cathode

MPNSTPS40SM100CG
Obsolete

STMicroelectronics STPS40SM100CG, Schottky diode, 1 Pair Common Cathode, 100 V, 20 A per diode, 810 mV Vf, D2PAK, Surface Mount, Tube.

STMicroelectronics STPS40SM100CG datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STPS40SM100CG specifications
ParameterValue
Diode typeSchottky
MountingSurface Mount
Voltage - DC reverse (Vr)100 V
Voltage - forward (Vf) (Max) @ if810 mV @ 20 A
Current - reverse leakage @ vr45 µA @ 100 V
Current - average rectified (Io) (per diode)20A
Operating temperature - junction150°C(Max)
SpeedFast Recovery =< 500ns, > 200mA (Io)
PackageTube
CaseTO-263-3, D²Pak (2 Leads + Tab), TO-263AB
Diode configuration1 Pair Common Cathode

Product details

Dual Schottky in a D2PAK – what this part is

The STPS40SM100CG is a dual Schottky rectifier from STMicroelectronics, configured as a common-cathode pair in a single D2PAK surface-mount package. Each diode is rated for 20 A average rectified current and a 100 V reverse voltage, with a forward voltage drop of 810 mV at 20 A. The fast-recovery characteristic (≤500 ns, >200 mA Io) suits it for high-frequency switching power supplies and output rectification stages where Schottky's low Vf and fast switching reduce losses.

If your design is still in development, consider qualifying a current-production dual-Schottky in D2PAK from ST's STPS40 family or a pin-compatible alternative before the remaining stock dries up.

20 A per diode, 100 V – thermal and layout notes

At 20 A per diode the forward drop hits 810 mV, which works out to about 16 W per diode in conduction loss at full rated current. The common-cathode configuration means the two anodes are separate; the shared cathode is the tab, which is usually tied to the output rail in a center-tapped rectifier or to ground in a negative-rail OR-ing circuit. Reverse leakage at 100 V is 45 µA – negligible at room temperature, but it doubles roughly every 10°C rise, so budget for it at high junction temperature.

Frequently asked questions

Is STPS40SM100CG obsolete?

Yes, STMicroelectronics lists the STPS40SM100CG as obsolete. No direct replacement has been announced. For existing BOM lines, sourcing is through the independent market; for new designs, look at current-production dual-Schottky diodes in D2PAK from the STPS40 family or equivalent.

What is the replacement for STPS40SM100CG?

STMicroelectronics has not published an official successor for the STPS40SM100CG. A functionally similar current-production part would need to match the 100 V, 20 A per diode, common-cathode, D2PAK footprint. Check the STPS40L60CG (lower Vf but 60 V rating) or other STPS40 variants – verify pin-compatibility and electrical margins before substitution.

STPS40SM100CG vs STPS40L60CG – which is better?

The STPS40L60CG is a 60 V device versus the SM100CG's 100 V rating. If your rail voltage is under 60 V, the L60CG's lower forward drop (typically 620 mV at 20 A vs 810 mV) reduces conduction loss. But for a 100 V bus, the SM100CG is the only one that fits the voltage rating. Both are common-cathode dual diodes in D2PAK, so they are footprint-compatible. The SM100CG is obsolete; the L60CG may still be active – check current lifecycle status.