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Best Alternatives to SK34

Package: SMA (DO-214AC)Micro Commercial Components Corp.Diodes - Rectifiers - SingleMfr: Micro Commercial CoSeries: -Package: Tape & Reel (TR); Cut Tape (CT)Diode Type: SchottkyVoltage - DC Reverse (Vr) (Max): 40 V

The SK34 is an obsolete 3A, 40V Schottky rectifier in an SMA package. Several alternatives are available, including direct replacements like the SS34A and drop-in upgrades like the SS56.

AI replacement insight

Electrical risklow

Many parts match or exceed the 40V/3A rating.

Package riskmedium

Must verify candidate is in DO-214AC (SMA) and not a similar variant like SMC or SMB.

Sourcing risklow

This is a common diode type with many manufacturers.

Can it be replaced directly?

Direct replacement for SK34 should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

SS34A for a direct match or SS56 for a drop-in upgrade with higher ratings.

Main risk

The primary risk is package incompatibility. Many similar part numbers exist in different packages (e.g., SMC, SMB), which are not footprint-compatible with SMA.

Recommended alternatives

3
SS34A package
SS34A

Yangzhou Yangjie Electronic Technology Co.,Ltd

Needs validationlow risk

A strong alternative with matching key electrical ratings and package.

View details

Alternative comparison matrix

Feature / factorSK34SS34ASS56SS36Compatibility / risk
PackageDO-214AC (SMA)DO-214AC (SMA)DO-214AC, SMADO-214AC (SMA) or DO-214AB (SMC)DO-214AC (SMA) / DO-214AC, SMA / DO-214AC (SMA) or DO-214AB (SMC) — Package appears to be a direct match.; SS56: Most sources indicate a matching SMA package.; SS36: Conflicting data exists. Must verify package is SMA, not SMC.
Voltage40V40V60V60V40V / 60V — Reverse voltage rating matches.; SS56: Higher voltage rating provides more design margin.; SS36: Higher voltage rating provides more design margin.
Current3A3A5A3A3A / 5A — Average rectified current matches.; SS56: Higher current rating provides more design margin.; SS36: Average rectified current matches.
Vf700mV @ 3AVaries by Mfr (500-700mV)--Varies by Mfr (500-700mV) — Forward voltage is similar, check datasheet for specific value.

Application & sourcing insights

Questions & answers

Verified drop-in options for SK34 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.