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Best Alternatives to SM340A

Package: SMA/DO-214ACFUXINSEMIRectifiersProduct type: Schottky barrier rectifierRepetitive peak reverse voltage (VRRM): 40 VAverage rectified output current (IO): 3 ASurge forward current (IFSM): 70 AMaximum forward voltage (VF): 0.55 V at IFM = 3 A

SM340A is a common 40V, 3A Schottky diode in an SMA package. This page reviews and compares potential alternatives like the B340A and SS54, focusing on electrical and package compatibility for your design.

AI replacement insight

Electrical risklow

Risk is low if forward voltage (Vf) is matched. Higher Vf increases power loss.

Package risklow

The DO-214AC (SMA) package is highly standardized, making mechanical replacement straightforward.

Sourcing risklow

Alternatives like B340A and SS54 are widely available from multiple manufacturers, reducing sourcing risk.

Can it be replaced directly?

Direct replacement for SM340A should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

The B340A is the most direct replacement path, being an industry-standard equivalent from multiple vendors.

Main risk

The primary risk when substituting is a higher forward voltage (Vf), which increases power dissipation and can affect thermal performance.

Recommended alternatives

3
B340A package
B340A

MDD(Microdiode Semiconductor)

Needs validationlow risk

Excellent alternative with identical key ratings and package. A common industry-standard equivalent.

View details

Alternative comparison matrix

Feature / factorSM340AB340ASS54SS56Compatibility / risk
PackageDO-214AC (SMA)DO-214AC (SMA)DO-214AC (SMA)DO-214AC (SMA)DO-214AC (SMA) — Package matches target.; SS54: Package matches target.; SS56: Package matches target.
Voltage40V40V40V60V40V / 60V — Reverse voltage matches.; SS54: Reverse voltage matches.; SS56: Higher voltage rating provides more margin.
Current3A3A5A5A3A / 5A — Forward current matches.; SS54: Higher current rating provides more margin.; SS56: Higher current rating provides more margin.
Forward Voltage0.50V @ 3A~0.50V - 0.55V @ 3A0.55V @ 5A0.70V @ 5A~0.50V - 0.55V @ 3A / 0.55V @ 5A / 0.70V @ 5A — Very close match, check datasheet for specific variant.; SS54: Slightly higher Vf, may increase power loss.; SS56: Significantly higher Vf will increase power loss.

Application & sourcing insights

Questions & answers

Verified drop-in options for SM340A 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.