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Best Alternatives to SS34-MS

Package: DO-214AC (SMA)MSKSEMIDiodes - Rectifiers - SingleDiode Type: SchottkyVoltage - DC Reverse (Vr) (Max): 40 VCurrent - Average Rectified (Io): 3 AVoltage - Forward (Vf) (Max) @ If: 0.70 V @ 3 ACurrent - Reverse Leakage @ Vr: 0.5 mA @ 40 V

The SS34-MS is a widely used 40V, 3A Schottky rectifier in a standard SMA package. Numerous pin-compatible alternatives are available from various manufacturers, often providing upgraded voltage, current, or efficiency.

AI replacement insight

Package risklow

The DO-214AC (SMA) package is highly standardized, minimizing physical compatibility issues.

Electrical riskmedium

While voltage/current are easy to match, variations in Vf, Ir, and capacitance can impact circuit behavior. Review of the full datasheet is critical.

Sourcing risklow

This is a common diode type with many manufacturers, ensuring a stable supply chain.

Can it be replaced directly?

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

Best replacement path

For improved efficiency, SM340A is the best path due to its lower forward voltage. For increased robustness, SS36 (60V) or SS310 (100V) offer higher voltage margins.

Main risk

The primary risk when substituting is a mismatch in secondary electrical parameters, especially forward voltage (Vf) and reverse leakage current (Ir), which can affect system efficiency and thermal performance.

Recommended alternatives

3
SM340A package
SM340A

FUXINSEMI

Needs validationlow risk

Pin-compatible alternative with identical ratings and a lower forward voltage for improved efficiency.

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Alternative comparison matrix

Feature / factorSS34-MSSM340ASS36SS54Compatibility / risk
PackageDO-214AC (SMA)DO-214AC (SMA)DO-214AC (SMA)DO-214AC (SMA)DO-214AC (SMA) — Same package ensures form and fit compatibility.; SS36: Same package ensures form and fit compatibility.; SS54: Same package ensures form and fit compatibility.
Voltage40V40V60V40V40V / 60V — Identical voltage rating.; SS36: Higher voltage rating provides increased design margin.; SS54: Identical voltage rating.
Current3.0A3.0A3.0A5.0A3.0A / 5.0A — Identical current rating.; SS36: Identical current rating.; SS54: Higher current rating provides increased thermal margin.
Forward Voltage0.7V @ 3A0.5V @ 3A--0.5V @ 3A — Lower forward voltage improves efficiency.
TypeSchottky-Schottky-Schottky — Same diode technology.

Application & sourcing insights

Questions & answers

Verified drop-in options for SS34-MS 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.