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STMicroelectronics STPS40L40CW — Discrete Semiconductors

STPS40L40CW Schottky diode, 40 V, 20 A per diode, TO-247-3

MPNSTPS40L40CW
Obsolete

STMicroelectronics STPS40L40CW, dual common-cathode Schottky rectifier, 40 V reverse, 20 A per diode, 530 mV Vf at 20 A, Fast Recovery ≤ 500 ns, TO-247-3 through-hole package, 150°C max junction temperature.

STMicroelectronics STPS40L40CW datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STPS40L40CW specifications
ParameterValue
MountingThrough Hole
Voltage - DC reverse (Vr)40 V
Voltage - forward (Vf) (Max) @ if530 mV @ 20 A
Current - reverse leakage @ vr800 µA @ 40 V
Current - average rectified (Io) (per diode)20A
Operating temperature - junction150°C (Max)
SpeedFast Recovery =< 500ns, > 200mA (Io)
PackageTube
TechnologySchottky
CaseTO-247-3
Diode configuration1 Pair Common Cathode

Product details

40 V Schottky pair — why the common-cathode matters

Each diode is rated for 20 A average rectified current at a 40 V maximum reverse voltage, with a forward voltage drop of 530 mV at 20 A — a low-Vf figure that keeps conduction losses manageable in a center-tap or OR-ing topology.

20 A per leg — thermal budget in TO-247-3

At 20 A per diode, the 530 mV Vf produces 10.6 W of conduction loss per leg. The 800 µA reverse leakage at 40 V is a Schottky characteristic that rises sharply with temperature; in a sealed enclosure above 100°C ambient, leakage-induced self-heating can shrink the safe operating area.

Frequently asked questions

Is STPS40L40CW obsolete?

Yes, the STPS40L40CW is officially Obsolete per STMicroelectronics, with no successor part number provided in the lifecycle record.

What is the junction temperature of STPS40L40CW?

The maximum operating junction temperature is 150°C. This is the thermal ceiling for the die; the TO-247-3 package must be heatsunk to keep the junction below this limit under full 20 A per diode load.