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STMicroelectronics STPS40M80CT — Discrete Semiconductors

STPS40M80CT Schottky Diode, 80 V, 40 A Common Cathode

MPNSTPS40M80CT
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STMicroelectronics STPS40M80CT Schottky rectifier, 80 V DC reverse, 20 A average per diode, common-cathode pair, 735 mV forward drop at 20 A, TO-220-3 through-hole, fast recovery ≤ 500 ns.

$2.0500Ref. price · indicative, final on quote
STMicroelectronics STPS40M80CT datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STPS40M80CT specifications
ParameterValue
MountingThrough Hole
Voltage - DC reverse (Vr)80 V
Voltage - forward (Vf) (Max) @ if735 mV @ 20 A
Current - reverse leakage @ vr65 µA @ 80 V
Current - average rectified (Io) (per diode)20A
Operating temperature - junction175°C (Max)
SpeedFast Recovery =< 500ns, > 200mA (Io)
PackageTube
TechnologySchottky
CaseTO-220-3
Diode configuration1 Pair Common Cathode

Product details

735 mV forward drop at 20 A — the conduction loss number

The STPS40M80CT is a dual Schottky rectifier from STMicroelectronics, pairing two 20 A diodes in a common-cathode configuration inside a single TO-220-3 through-hole package.

Rated for 80 V DC reverse maximum, this part suits 48 V bus rails, 60 V battery systems, and power supplies with a healthy derating margin. The junction temperature rating of 175 °C maximum allows operation in tight thermal enclosures or high-ambient industrial environments, provided the heatsink keeps Tj below that ceiling. Reverse leakage is 65 µA at 80 V and 25 °C junction — expect it to rise with temperature, so budget the standby loss in a hot chassis accordingly.

Frequently asked questions

What is the difference between STPS40M80CT and STPS40M60CT?

The two parts share the same package, pinout, and current rating. The difference is the reverse voltage: STPS40M80CT is rated for 80 V, while STPS40M60CT is rated for 60 V. Choose the 80 V version when the DC bus or peak reverse voltage exceeds 60 V.

Is STPS40M80CT a common cathode diode?

Yes, the diode configuration is 1 pair common cathode — the two anodes are separate, and the cathodes are tied together internally. This is the standard topology for a dual Schottky in a TO-220 for OR-ing or center-tap rectifier circuits.