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STMicroelectronics STPS1L40U — Discrete Semiconductors

STPS1L40U Schottky Diode, 40V 1A, SMB, 500mV Vf

MPNSTPS1L40U
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STMicroelectronics STPS1L40U, Schottky diode, 40V reverse, 1A forward, 500mV Vf at 1A, 35µA leakage, 150°C Tj, DO-214AA (SMB) surface mount, ROHS3 compliant.

$0.4300Ref. price · indicative, final on quote
STMicroelectronics STPS1L40U datasheet (PDF)
PackagingDO-214AA, SMB
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STPS1L40U specifications
ParameterValue
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 - junction150°C(Max)
SpeedFast Recovery =< 500ns, > 200mA (Io)
PackageTape & Reel (TR); Cut Tape (CT)
CaseDO-214AA, SMB

Product details

1A Schottky in a DO-214AA body

The STPS1L40U is a 40 V, 1 A Schottky barrier rectifier from STMicroelectronics, housed in a DO-214AA (SMB) surface-mount package. It targets low-voltage, high-frequency rectification and freewheeling in DC-DC converters, polarity protection, and OR-ing diodes in 5 V and 3.3 V rails.

At 1 A forward current, the maximum forward voltage is 500 mV — this sets the conduction loss floor at 0.5 W. The reverse leakage at 40 V is 35 µA, which rises with junction temperature and can dominate the thermal budget above 100°C.

Frequently asked questions

Is STPS1L40U a direct replacement for 1N5819?

The STPS1L40U and 1N5819 are both 1 A Schottky rectifiers, but the 1N5819 is typically rated at 40 V in a DO-41 axial-lead package, while the STPS1L40U is a surface-mount SMB part. They are not pin-compatible — the 1N5819 is through-hole, the STPS1L40U is surface mount. For a surface-mount replacement, the SS14 (DO-214AC) is a closer footprint match but has different thermal characteristics.

Is STPS1L40U RoHS compliant?

Yes, the STPS1L40U is ROHS3 compliant.