What risks should I check before replacing STPS340U?

The main risk is a higher forward voltage (Vf) in the replacement part, which will increase power loss and generate more heat. Also, check the reverse leakage current (Ir), as a higher value can affect low-power states.

STPS340U Alternatives, Datasheet & Cross Reference | STMicroelectronics

STPS340U is a 40V, 3A Schottky rectifier in a standard SMB package, optimized for low forward voltage drop. When seeking replacements, key factors are matching the package, ensuring equal or greater voltage/current ratings, and closely comparing forward voltage (Vf) to maintain system efficiency.

AI replacement insight

Electrical riskmedium

Higher forward voltage (Vf) or reverse leakage (Ir) can impact system efficiency and thermal performance.

Package risklow

The SMB package is standardized, making physical replacement straightforward.

Sourcing risklow

This is a common diode type with many cross-vendor options available.

Can it be replaced directly?

Direct replacement for STPS340U should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

STPS5L60U from STMicroelectronics is an ideal upgrade, offering higher voltage and current ratings with improved efficiency (lower forward voltage) in the same package.

Main risk

The primary risk is selecting a substitute with a higher forward voltage (Vf), which increases power dissipation and may require thermal re-evaluation of your design.

Recommended alternatives

An upgrade from the same manufacturer with higher voltage/current ratings and better efficiency.

View details

Alternative comparison matrix

Feature / factor	STPS340U	STPS5L60U	MBRS360BT3G	UMW SS36B	Compatibility / risk
Package	SMB	SMB	SMB (DO-214AA)	SMB (DO-214AA)	SMB / SMB (DO-214AA) — Package is a form-fit match.; MBRS360BT3G: Package is a form-fit match.; UMW SS36B: Package is a form-fit match.
Voltage	40V	60V	60V	60V	60V — Higher voltage rating provides more design margin.; MBRS360BT3G: Higher voltage rating provides more margin.; UMW SS36B: Higher voltage rating provides more margin.
Current	3A	5A	3A	3A	5A / 3A — Higher current rating provides more design margin.; MBRS360BT3G: Current rating matches the target.; UMW SS36B: Current rating matches the target.
Forward Voltage	0.57V @ 3A	0.48V @ 5A	~0.75V @ 3A	0.75V @ 3A	0.48V @ 5A / ~0.75V @ 3A — Lower forward voltage improves efficiency. Candidate Vf at 3A will be even lower.; MBRS360BT3G: Higher forward voltage will increase power loss and heat.; UMW SS36B: Higher forward voltage will increase power loss and heat.
Manufacturer	STMicroelectronics	STMicroelectronics	-	-	STMicroelectronics — Same manufacturer simplifies qualification.

Application & sourcing insights

Questions & answers

Verified drop-in options for STPS340U are limited in the current batch. Review candidates marked Strong match or Datasheet verified, and validate package, pinout, and electrical limits before committing a BOM change.