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STMicroelectronics STPS140UY — Discrete Semiconductors

STPS140UY Schottky Diode, 40 V, 1 A, SMB, AEC-Q101

MPNSTPS140UY
Active

STMicroelectronics STPS140UY, Q Automotive series, Schottky diode, 40 V reverse, 1 A average, 650 mV forward drop at 2 A, SMB surface-mount package, -40°C to 150°C junction.

$0.3070Ref. price · indicative, final on quote
STMicroelectronics STPS140UY datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STPS140UY specifications
ParameterValue
SeriesQ Automotive
Diode typeSchottky
MountingSurface Mount
Voltage - DC reverse (Vr)40 V
Voltage - forward (Vf) (Max) @ if650 mV @ 2 A
Current - reverse leakage @ vr12 µA @ 40 V
Current - average rectified1A
Operating temperature - junction-40°C~150°C
SpeedFast Recovery =< 500ns, > 200mA (Io)
PackageTape & Reel (TR); Cut Tape (CT)
CaseDO-214AA, SMB

Product details

40 V reverse — the blocking ceiling for a 24 V rail with margin

The STPS140UY is an automotive-grade Schottky rectifier from STMicroelectronics, rated for 40 V reverse voltage and 1 A average forward current. Typical applications include reverse-polarity protection, freewheeling diodes in DC-DC converters, and OR-ing diodes in automotive ECU power feeds.

Forward drop and leakage — thermal budget drivers

Reverse leakage is specified at 12 µA at 40 V and 25°C junction temperature. Both parameters shift with temperature — Vf decreases slightly while leakage rises exponentially above 100°C, so the SMB package's copper pad area under the cathode tab directly affects the junction temperature rise.

Active lifecycle, automotive qualification

The Q Automotive series designation means it is tested to AEC-Q101 stress conditions, covering temperature cycling, high-temperature reverse bias, and humidity.

Frequently asked questions

Is STPS140UY automotive qualified?

Yes, it is part of ST's Q Automotive series, which means it is qualified to AEC-Q101 stress requirements. It is suitable for automotive applications including ECU power supplies, lighting, and motor drive freewheeling diodes.

What package is STPS140UY?

The STPS140UY is supplied in a DO-214AA (SMB) surface-mount package.

What is the reverse leakage current of STPS140UY?

Reverse leakage is 12 µA typical at 40 V reverse voltage and 25°C junction temperature. Leakage increases with junction temperature — at 150°C it can be orders of magnitude higher, so thermal management is important.