ProjectsPricingInsights

Best Alternatives to SS34-SMB

Package: SMB (DO-214AA)GOODWORKDiodesReverse Voltage (Vr): 40 VRectified Current: 3 AForward Voltage (Vf@If): 0.55 V @ 3 APeak Forward Surge Current: 80 AReverse Leakage Current (Ir): 0.1 mA @ 25°C

Find reliable substitutes for the SS34-SMB, a 40V 3A Schottky diode in an SMB package. This page provides FAE-reviewed alternatives, highlighting pin-compatible options and key parametric differences to ensure a successful replacement.

AI replacement insight

Electrical riskmedium

A higher forward voltage (Vf) will increase power loss (P=Vf*I). A lower reverse voltage (Vr) is not acceptable.

Package risklow

The SMB (DO-214AA) package is standardized, making mechanical replacement straightforward.

Sourcing risklow

This is a common diode type with many manufacturers, but availability should always be confirmed.

Can it be replaced directly?

Direct replacement for SS34-SMB should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

SK54B-LTP is the strongest candidate due to its excellent match in package, voltage, and forward voltage, with a higher current rating for added margin.

Main risk

The primary risk is increased power dissipation and heat if a replacement has a higher forward voltage (Vf).

Recommended alternatives

5
SK54B-LTP package
SK54B-LTP

Micro Commercial Co

Needs validationlow risk

A 40V, 5A Schottky diode with a closely matched forward voltage and compatible SMB package.

View details

Alternative comparison matrix

Feature / factorSS34-SMBSK54B-LTPSTPS3L60USS1060BCompatibility / risk
PackageSMB (DO-214AA)SMB (DO-214AA)SMBSMBSMB (DO-214AA) — Mechanically compatible.; STPS3L60U: Mechanically compatible.; SS1060B: Mechanically compatible.; SS54B: Mechanically compatible.
Voltage40V40V60V60V40V / 60V — Identical voltage rating.; STPS3L60U: Higher voltage rating provides more margin.; SS1060B: Higher voltage rating provides more margin.; SS54B: Identical voltage rating.
Current3A5A3A10A5A / 3A / 10A — Higher current rating provides more margin.; STPS3L60U: Identical current rating.; SS1060B: Significantly higher current rating.; SS54B: Higher current rating provides more margin.
Forward Voltage0.55V @ 3A0.55V0.61V @ 3A0.7V @ 10A0.55V / 0.61V @ 3A / 0.7V @ 10A / ~0.6V @ 5A — Excellent Vf match ensures similar efficiency.; STPS3L60U: Slightly higher Vf may slightly increase power loss.; SS1060B: Vf at target's operating current (3A) is not specified but likely acceptable. Verification recommended.; SS54B: Slightly higher Vf may increase power loss. Verify at operating current.

Application & sourcing insights

Questions & answers

Verified drop-in options for SS34-SMB 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.