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Best Alternatives to SS54-MS

Package: DO-214AC (SMA)MSKSEMIDiodes - Rectifiers - SingleDiode Type: SchottkyVoltage - DC Reverse (Vr) (Max): 40 VCurrent - Average Rectified (Io): 5 AVoltage - Forward (Vf) (Max) @ If: 0.55 V @ 5 ACurrent - Reverse Leakage @ Vr: 0.2 mA @ 40 V

The SS54-MS is a 40V, 5A Schottky diode in a common SMA package, used for rectification in power supplies. Finding a replacement involves matching the package and ensuring voltage and current ratings are met, while paying close attention to forward voltage for thermal performance.

AI replacement insight

Electrical riskmedium

Vf and Ir variations are common and impact efficiency/thermals.

Package risklow

SMA is standard, but some candidates use different packages.

Firmware risklow

Not applicable for a simple diode.

Sourcing risklow

This is a common diode type with many vendors.

Can it be replaced directly?

Yes, several parts like the BORN SS56 SMA offer the same SMA package and similar ratings, but differences in forward voltage (Vf) and reverse leakage (Ir) mean they are form-fit-function alternates, not guaranteed drop-in replacements. Engineering review is required.

Best replacement path

Look for Schottky diodes in a DO-214AC (SMA) package with Vr ≥ 40V and Io ≥ 5A. The BORN SS56 SMA is a strong candidate with the same package and higher voltage rating, but requires checking the impact of its slightly higher forward voltage.

Main risk

The primary risk is increased power dissipation and heat due to higher forward voltage (Vf) in substitutes, potentially affecting thermal management and efficiency.

Recommended alternatives

4
SS56 SMA package
SS56 SMA

BORN

Needs validationlow risk

Strong form-fit candidate with same package and higher voltage; review thermal impact from higher Vf.

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Alternative comparison matrix

Feature / factorSS54-MSSS56 SMASS510 SMASTPS5L60UCompatibility / risk
PackageDO-214AC (SMA)SMA (DO-214AC)DO-214AC (SMA)SMBSMA (DO-214AC) / DO-214AC (SMA) / SMB — Same package and pinout.; SS510 SMA: Same package and pinout.; STPS5L60U: Different footprint (SMB vs SMA), requires PCB change.; UMW SS510B: Different footprint (SMB vs SMA), requires PCB change.
Voltage40V60V100V60V60V / 100V — Higher voltage rating provides more margin.; SS510 SMA: Higher voltage rating provides more margin.; STPS5L60U: Higher voltage rating provides more margin.; UMW SS510B: Higher voltage rating provides more margin.
Current5A5A5A5A5A — Same current rating.; SS510 SMA: Same average forward current rating.; STPS5L60U: Same average forward current rating.; UMW SS510B: Same average forward current rating.
Forward Voltage0.55V @ 5A0.65V @ 5A0.85V @ 5A0.48V @ 5A0.65V @ 5A / 0.85V @ 5A / 0.48V @ 5A / 0.85V @ 3A — Slightly higher Vf increases power loss.; SS510 SMA: Higher Vf increases power loss.; STPS5L60U: Lower Vf reduces power loss.; UMW SS510B: Higher Vf at lower current; will be worse at 5A.
Reverse Leakage0.2mA @ 40V-1mA @ 100V-1mA @ 100V — Significantly higher leakage current.

Application & sourcing insights

Questions & answers

The BORN SS56 SMA is a strong alternative in the same SMA package with a higher 60V rating. However, its forward voltage is slightly higher, so thermal performance should be verified in your application.