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STMicroelectronics STPS1L40AY — Discrete Semiconductors

STPS1L40AY Schottky Diode, 40 V, 1 A, SMA, Automotive Grade

MPNSTPS1L40AY
Active

STMicroelectronics STPS1L40AY, Q Automotive series, Schottky rectifier, 40 V Vr, 1 A Io, 500 mV Vf at 1 A, 35 µA Ir at 40 V, DO-214AC SMA, -40°C to 150°C junction.

$0.6400Ref. price · indicative, final on quote
STMicroelectronics STPS1L40AY datasheet (PDF)
PackagingDO-214AC, SMA
RoHSROHS3 Compliant
SeriesQ
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STPS1L40AY specifications
ParameterValue
SeriesQ Automotive
Diode typeSchottky
MountingSurface Mount
Voltage - DC reverse (Vr)40 V
Voltage - forward (Vf) (Max) @ if500 mV @ 1 A
Current - reverse leakage @ vr35 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-214AC, SMA

Product details

40 V, 1 A Schottky — the automotive-grade rectifier for low-forward-drop rails

The STPS1L40AY is an automotive-grade Schottky rectifier from STMicroelectronics' Q Automotive series, rated 40 V reverse voltage and 1 A average forward current in a DO-214AC (SMA) surface-mount package. Its key spec for the BOM is the 500 mV maximum forward voltage at 1 A — that 0.5 V drop at rated current is the conduction-loss floor you budget for in a 1 A rail. The 35 µA reverse leakage at 40 V is the ceiling; at elevated junction temperatures leakage climbs, so the thermal design needs headroom.

Junction temperature range and the SMA thermal path

For a 1 A continuous load at 500 mV Vf, expect about 0.5 W dissipation; the SMA can handle that with adequate board copper, but derate above 100°C junction.

Active production, AEC-Q101 qualified

The Q-series suffix signals AEC-Q101 qualification, so this part is released for automotive PPAP submissions and production. ROHS3 compliant.

Frequently asked questions

Is STPS1L40AY automotive qualified?

Yes — the Q Automotive series designation indicates AEC-Q101 qualification, suitable for automotive PPAP and production use in under-hood and chassis-domain applications.

What is the maximum reverse leakage current of STPS1L40AY?

The reverse leakage is 35 µA maximum at 40 V reverse voltage, 25°C junction. Leakage increases with temperature; at the 150°C junction limit it will be significantly higher — budget derating in high-temperature designs.