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STMicroelectronics STPS3L40UFN — Discrete Semiconductors

STPS3L40UFN Schottky Diode, 40 V 3 A, SMA Flat Leads

MPNSTPS3L40UFN
Obsolete

STMicroelectronics STPS3L40UFN Schottky rectifier diode, 40 V reverse voltage, 3 A average forward current, 500 mV forward drop at 3 A, SMA Flat Leads (DO-221AC) package, ECOPACK2 compliant.

$0.1700Ref. price · indicative, final on quote
STMicroelectronics STPS3L40UFN datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STPS3L40UFN specifications
ParameterValue
SeriesECOPACK®2
Diode typeSchottky
MountingSurface Mount
Voltage - DC reverse (Vr)40 V
Voltage - forward (Vf) (Max) @ if500 mV @ 3 A
Current - reverse leakage @ vr100 mA @ 40 V
Current - average rectified3A
Operating temperature - junction150°C
SpeedFast Recovery =< 500ns, > 200mA (Io)
PackageTape & Reel (TR); Cut Tape (CT)
CaseDO-221AC, SMA Flat Leads

Product details

40 V, 3 A Schottky in a low-profile SMA Flat Leads package

The STPS3L40UFN is a Schottky rectifier diode from STMicroelectronics, rated for 40 V DC reverse voltage and 3 A average rectified current. It is housed in the DO-221AC (SMA Flat Leads) package with a SMAflat Notch supplier device package, designed for surface-mount assembly where board height is constrained. The forward voltage drop is specified at 500 mV at 3 A, which keeps conduction losses manageable in low-voltage power rails. The part carries ECOPACK2 compliance for RoHS and environmental requirements.

Obsolete — planning for replacement

The STPS3L40UFN is listed as obsolete. For new designs or BOM sustainment, a form-fit-function replacement in the same SMA Flat Leads footprint and 40 V, 3 A rating class will need to be qualified. The independent distribution channel can still supply this part against an RFQ, but the window for factory-origin stock is closed.

Reverse leakage and junction temperature limits

Reverse leakage current is specified at 100 mA at the rated 40 V reverse voltage — a figure that reflects the Schottky's higher leakage versus a PN-junction diode, important to budget in standby or high-temperature operation. The maximum junction temperature is 150 °C, which sets the thermal derating line for the 3 A forward current in the end system.

Frequently asked questions

Is STPS3L40UFN obsolete?

Yes, the STPS3L40UFN is listed as obsolete. No official successor is recorded in the lifecycle data. For replacement, look for a 40 V, 3 A Schottky in the same SMA Flat Leads (DO-221AC) footprint.

What is the maximum current and voltage of STPS3L40UFN?

The maximum DC reverse voltage is 40 V, and the average rectified forward current is 3 A. The forward voltage drop is 500 mV at 3 A.

Does STPS3L40UFN have RoHS or environmental compliance?

Yes, the STPS3L40UFN is part of the ECOPACK2 series, which indicates RoHS compliance and a halogen-free, antimony-free bill of materials per ST's environmental program.