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Best Alternatives to UMW SS34C

Package: SMC (DO-214AB)UMWDiodes - Rectifiers - SingleDiode Type: SchottkyVoltage - DC Reverse (Vr) (Max): 40 VCurrent - Average Rectified (Io): 3 AVoltage - Forward (Vf) (Max) @ If: 0.5 V @ 3 AMounting Type: Surface Mount

UMW SS34C is a 40V, 3A Schottky rectifier in a standard SMC package, ideal for high-efficiency power applications. This page reviews and compares potential alternatives to help you find a suitable replacement.

AI replacement insight

Electrical riskmedium

Some alternatives have higher Vf or narrower temperature ranges.

Package risklow

All reviewed candidates use the same SMC package.

Can it be replaced directly?

Direct replacement for UMW SS34C should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

MBRS540T3G from onsemi is the best replacement, offering upgraded current handling in the same package with matching electricals.

Main risk

The primary risk when substituting is a higher forward voltage (Vf), which increases power loss and heat. This must be checked.

Recommended alternatives

3
MBRS540T3G package
MBRS540T3G

onsemi

Needs validationlow risk

Strong pin-compatible alternate from onsemi with higher current rating and similar performance.

View details

Alternative comparison matrix

Feature / factorUMW SS34CMBRS540T3GSS36SMCSS36(SMC)Compatibility / risk
PackageSMC (DO-214AB)SMC (DO-214AB)SMC (DO-214AB)SMCSMC (DO-214AB) — Same package and pin count.; SS36SMC: Same package and pin count.; SS36(SMC): Same package and pin count.
Voltage40V40V60V60V40V / 60V — Voltage rating matches.; SS36SMC: Higher voltage rating.; SS36(SMC): Higher voltage rating.
Current3A5A3A-5A / 3A — Higher current rating provides more margin.; SS36SMC: Current rating matches.
Forward Voltage0.5V @ 3A0.5V @ 5A0.7V @ 3A0.7V @ 3A0.5V @ 5A / 0.7V @ 3A — Vf is comparable or better at target's operating current.; SS36SMC: Higher Vf increases power loss.; SS36(SMC): Higher Vf increases power loss.
Temperature-55°C to 150°C-65°C to +150°C--55°C to +125°C-65°C to +150°C / -55°C to +125°C — Wider operating temperature range.; SS36(SMC): Reduced maximum operating temperature.

Application & sourcing insights

Questions & answers

Verified drop-in options for UMW SS34C 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.