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Best Alternatives to SS33

Package: DO-214AB, SMConsemiDiodes - Rectifiers - SingleSeries: -Package: BulkVoltage - DC Reverse (Vr) (Max): 30 VCurrent - Average Rectified (Io): 3AVoltage - Forward (Vf) (Max) @ If: 500 mV @ 3 A

Find the best replacement for the SS33, a 30V, 3A Schottky diode in a DO-214AC (SMA) package. This page provides datasheet-verified alternatives, including pin-compatible upgrades and functional equivalents.

AI replacement insight

Electrical risklow

Many candidates offer superior voltage/current ratings. Check Vf for efficiency-sensitive designs.

Package risklow

Numerous alternatives exist in the same DO-214AC (SMA) package, ensuring form-fit compatibility.

Sourcing risklow

This is a common diode type with many manufacturers, providing a robust supply chain.

Can it be replaced directly?

Direct replacement for SS33 should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

SS56 or SK56A-LTP are excellent upgrade paths, offering higher 60V/5A ratings in the same SMA package.

Main risk

The primary risk when substituting is a potential increase in forward voltage (Vf), which can reduce power efficiency and increase heat generation.

Recommended alternatives

5
SK56A-LTP package
SK56A-LTP

Micro Commercial Co

Needs validationmedium risk

A 60V, 5A Schottky diode in the same SMA package. A strong upgrade, but check for higher forward voltage.

View details

Alternative comparison matrix

Feature / factorSS33SK56A-LTPSS56SS54ACompatibility / risk
PackageDO-214AC (SMA)DO-214AC (SMA)DO-214AC (SMA)SMA/DO-214ACDO-214AC (SMA) / SMA/DO-214AC — Same package family.; SS56: Same package family ensures form-fit compatibility.; SS54A: Same package family.; SS315: Same package family.
Voltage30V60V60V40V60V / 40V / 150V — Higher voltage rating.; SS56: Higher voltage rating provides more design margin.; SS54A: Higher voltage rating.; SS315: Significantly higher voltage rating.
Current3A5A5A5A5A / 3A — Higher current rating.; SS56: Higher current rating provides more design margin.; SS54A: Higher current rating.; SS315: Current rating matches the target.
Forward Voltage0.55V @ 3A0.75V @ 5A--0.75V @ 5A — May have higher Vf than target's 0.55V @ 3A.
Polarity Or TypeSchottky-Schottky-Schottky — Diode type matches.

Application & sourcing insights

Questions & answers

Verified drop-in options for SS33 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.