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STMicroelectronics STPS3L40UF — Discrete Semiconductors

STPS3L40UF Schottky Diode, 40V 3A, SMBflat

MPNSTPS3L40UF
Active

STMicroelectronics STPS3L40UF, Schottky Diode, 40 V reverse voltage, 3 A average rectified current, 500 mV forward drop at 3 A, SMBflat package, Surface Mount.

$0.6000Ref. price · indicative, final on quote
STMicroelectronics STPS3L40UF datasheet (PDF)
PackagingDO-221AA, SMB Flat Leads
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STPS3L40UF specifications
ParameterValue
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 - junction150°C (Max)
SpeedFast Recovery =< 500ns, > 200mA (Io)
PackageTape & Reel (TR) Cut Tape (CT)
TechnologySchottky
CaseDO-221AA, SMB Flat Leads

Product details

The STPS3L40UF is a 40 V, 3 A Schottky rectifier from STMicroelectronics in the SMBflat surface-mount package. It delivers a low forward voltage of 500 mV at the full 3 A rated current, which keeps conduction losses down in low-voltage, high-frequency switching supplies and polarity-protection circuits. The Schottky technology gives fast recovery — under 500 ns — so it handles the switching edges in a 100 kHz or higher DC-DC converter without the reverse-recovery losses that plague a PN-junction diode.

It is ROHS3 compliant. For a production BOM line this means no last-time-buy pressure and no forced redesign for compliance.

Frequently asked questions

Can STPS3L40UF be used in a 3.3 V power rail?

Yes. The 40 V reverse rating gives ample headroom on a 3.3 V rail. The 500 mV forward drop at 3 A means about 15 % of the rail voltage is lost as forward drop — acceptable for OR-ing or reverse-polarity protection, but for a high-efficiency 3.3 V output stage a lower-Vf Schottky (e.g., 300 mV class) would waste less power.