What risks should I check before replacing SS56(SMB)?

Before replacing, check three main risks: 1) Forward Voltage (Vf) mismatch, which impacts power efficiency and heat generation. 2) Reverse Leakage (Ir) mismatch, critical for high-temp stability. 3) Diode Type, ensuring the replacement is also a Schottky and not a slower standard recovery diode.

SS56(SMB) Alternatives, Datasheet & Cross Reference | TWGMC

The SS56(SMB) is a 60V, 5A Schottky rectifier in a standard SMB package, widely used in power applications. Several potential alternatives are available, with SS56B being a strong candidate for a pin-compatible replacement.

AI replacement insight

Electrical risklow

Key ratings match on best candidates, but secondary parameters like Vf and Ir must be checked.

Package risklow

The SMB (DO-214AA) package is highly standardized, ensuring physical compatibility.

Sourcing risklow

This is a common diode specification with multiple manufacturers available.

Can it be replaced directly?

Direct replacement for SS56(SMB) should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

The SS56B from manufacturers like FUXINSEMI or Yangjie is the most promising replacement path, offering matching key specifications.

Main risk

The main risk when substituting Schottky diodes is a mismatch in secondary electrical parameters, primarily forward voltage (Vf) affecting efficiency and reverse leakage current (Ir) affecting standby power and thermal stability.

Recommended alternatives

A likely pin-compatible Schottky diode with matching key electrical ratings and package.

View details

Alternative comparison matrix

Feature / factor	SS56(SMB)	SS56B	UMW SS510B	STPS5L60U	Compatibility / risk
Polarity Or Type	Schottky	Schottky	-	-	Schottky — Diode technology matches.
Voltage	60V	60V	100V	-	60V / 100V — Reverse voltage rating matches.; UMW SS510B: Higher voltage rating provides more design margin.
Current	5A	5A	5A	-	5A — Average rectified current matches.; UMW SS510B: Current rating matches.
Forward Voltage	0.70V @ 5A	0.70V @ 5A	0.85V @ 3A	0.48V @ 5A	0.70V @ 5A / 0.85V @ 3A / 0.48V @ 5A — Forward voltage and efficiency are identical.; UMW SS510B: Higher Vf means lower efficiency and more heat.; STPS5L60U: Significantly lower Vf improves efficiency.
Package	SMB (DO-214AA)	SMB (DO-214AA)	SMB	SMB	SMB (DO-214AA) — Package is a physical match.; UMW SS510B: Package is a physical match.; STPS5L60U: Package is a physical match.
Reverse Leakage	0.3mA @ 60V	-	-	100mA @ 60V	100mA @ 60V — Extremely high reverse leakage is a major risk.
Voltage Current	60V / 5A	-	-	60V / 5A	60V / 5A — Primary ratings match.

Application & sourcing insights

Questions & answers

Verified drop-in options for SS56(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.