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STMicroelectronics STPS340S — Discrete Semiconductors

STPS340S Schottky Diode, 40V 3A, SMC Package

MPNSTPS340S
Active

STMicroelectronics STPS340S Schottky diode, 40 V reverse, 3 A average rectified, 630 mV forward voltage at 3 A, fast recovery ≤500 ns, SMC surface-mount package.

$0.6200Ref. price · indicative, final on quote
STMicroelectronics STPS340S datasheet (PDF)
PackagingDO-214AB, SMC
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STPS340S specifications
ParameterValue
Diode typeSchottky
MountingSurface Mount
Voltage - DC reverse (Vr)40 V
Voltage - forward (Vf) (Max) @ if630 mV @ 3 A
Current - reverse leakage @ vr20 µA @ 40 V
Current - average rectified3A
Operating temperature - junction150°C(Max)
SpeedFast Recovery =< 500ns, > 200mA (Io)
PackageTape & Reel (TR); Cut Tape (CT)
CaseDO-214AB, SMC

Product details

The STPS340S is a 40 V, 3 A Schottky rectifier in an SMC (DO-214AB) surface-mount package. It is specified for fast recovery — ≤500 ns at >200 mA — which suits it for low-voltage power rectification, freewheeling diodes in DC-DC converters, and reverse-polarity protection where the forward voltage drop directly affects efficiency.

Forward voltage and leakage — the efficiency trade-off

At 3 A forward current the maximum forward voltage is 630 mV — a relatively low drop for a 3 A Schottky, which keeps conduction losses manageable in a 5 V or 3.3 V rail.

The base product number is STPS340; the 'S' suffix indicates the SMC package variant.

Frequently asked questions

Is STPS340S a direct replacement for STPS340?

Yes — STPS340S is the SMC surface-mount variant of the base STPS340. The base product number is STPS340; the 'S' suffix denotes the SMC package. If your BOM calls for the SMC footprint, this is the correct part.

Is STPS340S RoHS compliant and lead-free?

Yes — STPS340S is ROHS3 compliant, covering the current EU RoHS exemption categories. No separate lead-free statement is needed; ROHS3 compliance implies lead-free construction.