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STMicroelectronics STPS3L40SY — Discrete Semiconductors

STPS3L40SY Schottky Diode, 40V 3A, SMC, Q Automotive

MPNSTPS3L40SY
Active

STMicroelectronics STPS3L40SY, Q Automotive Schottky diode, 40 V reverse, 3 A average rectified, 500 mV forward drop at 3 A, fast recovery ≤500 ns, SMC surface-mount package, -40°C to 150°C junction.

$1.0200Ref. price · indicative, final on quote
STMicroelectronics STPS3L40SY datasheet (PDF)
PackagingDO-214AB, SMC
RoHSROHS3 Compliant
SeriesQ Automotive
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STPS3L40SY specifications
ParameterValue
SeriesQ Automotive
Diode typeSchottky
MountingSurface Mount
Voltage - DC reverse (Vr)40 V
Voltage - forward (Vf) (Max) @ if500 mV @ 3 A
Current - reverse leakage @ vr100 µA @ 40 V
Current - average rectified3A
Operating temperature - junction-40°C~150°C
SpeedFast Recovery =< 500ns, > 200mA (Io)
PackageTape & Reel (TR); Cut Tape (CT)
CaseDO-214AB, SMC

Product details

Schottky rectifier for 40 V, 3 A automotive power rails

The STPS3L40SY is a 40 V, 3 A Schottky diode from STMicroelectronics' Q Automotive series, housed in a DO-214AB (SMC) surface-mount package. Its 500 mV typical forward drop at 3 A keeps conduction losses low in the output rectification stage of a DC-DC converter or the freewheeling path of a motor-drive bridge. The 100 µA reverse leakage at 40 V is typical for a 40 V Schottky and rises with junction temperature, so the thermal design should budget for leakage at the 150°C maximum junction.

Junction temperature and automotive qualification

The Q Automotive series designation signals that this part is built and tested to the AEC-Q101 stress qualification for automotive-grade discrete semiconductors. Lifecycle status is Active, meaning ST continues to manufacture and support this part with no last-time-buy notice in effect. ROHS3 compliance covers the current exemption list for automotive applications.

No stock-holding claim; each order is verified against the BOM quantity and delivery window.

Frequently asked questions

What is the difference between the STPS3L40SY and the STPS3L40?

The STPS3L40SY carries the Q Automotive qualification (AEC-Q101 stress-tested), while the STPS3L40 is the commercial-grade variant. Electrically the two parts share the same 40 V, 3 A, 500 mV Vf ratings and the same SMC package. The SY suffix is the automotive-grade version for production BOMs that require AEC-Q compliance.