STPS5L60S
FUXINSEMI
Needs validationlow risk
Excellent pin-compatible upgrade with higher voltage/current ratings and better or equal forward voltage for improved efficiency.
Best Alternatives to SK33
The SK33 is a 30V, 3A Schottky rectifier in a standard SMC package, widely used in power conversion and protection circuits. Several pin-compatible alternatives with higher ratings are available, but careful review of forward voltage is crucial for thermal management.
AI replacement insight
Electrical riskmedium
Forward voltage (Vf) and reverse leakage (Ir) can vary, affecting efficiency and standby power. Higher Vf is the main concern.
Package risklow
The SMC (DO-214AB) package is standardized, making physical replacement straightforward.
Sourcing risklow
This is a common diode type with many cross-vendor options available.
Can it be replaced directly?
Direct replacement for SK33 should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.
Best replacement path
STPS5L60S is the best path, offering an upgrade in voltage and current with a similar or better forward voltage, minimizing thermal redesign.
Main risk
The primary risk is selecting a replacement with a higher forward voltage (Vf), which will increase power dissipation and component temperature.
Recommended alternatives
4Alternative comparison matrix
| Feature / factor | SK33 | STPS5L60S | SS1060 | SS56C | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SMC (DO-214AB) | SMC | SMC (DO-214AB) | DO-214AB (SMC) | SMC / SMC (DO-214AB) / DO-214AB (SMC) — Package is form and fit compatible.; SS1060: Package is form and fit compatible.; SS56C: Package is form and fit compatible.; SS54C: Package is form and fit compatible. |
| Voltage | 30V | 60V | 60V | 60V | 60V / 40V — Higher voltage rating provides more design margin.; SS1060: Higher voltage rating provides more design margin.; SS56C: Higher voltage rating provides more design margin.; SS54C: Higher voltage rating provides more design margin. |
| Current | 3A | 5A | 10A | 5A | 5A / 10A — Higher current rating provides more design margin.; SS1060: Significantly higher current rating.; SS56C: Higher current rating provides more design margin.; SS54C: Higher current rating provides more design margin. |
| Forward Voltage | 0.55V @ 3A | ~0.52V @ 5A | ~0.75V @ 10A | ~0.70V @ 5A | ~0.52V @ 5A / ~0.75V @ 10A / ~0.70V @ 5A / Not specified — Lower Vf improves efficiency and reduces heat.; SS1060: Higher Vf will increase power loss and heat.; SS56C: Higher Vf will increase power loss and heat.; SS54C: Must be checked from datasheet to ensure thermal compatibility. |
Application & sourcing insights
Questions & answers
Verified drop-in options for SK33 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.