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Best Alternatives to RB521C30

Package: SOD-923WILLSEMI(Will Semicon)DiodesReverse Voltage (Vr): 30 VAverage Rectified Forward Current (Io): 200 mAForward Voltage (Vf): 0.35 V @ 10 mAPeak Forward Surge Current (Ifsm): 500 mAReverse Current (Ir): 10 µA @ 10 V

RB521C30 is a 30V, 200mA Schottky diode in a compact SOD-923 package. This page reviews potential alternatives, highlighting key parametric differences for engineers to consider before making a substitution.

AI replacement insight

Electrical riskhigh

Most alternatives have a lower current rating, posing a significant risk of failure if not properly derated.

Package risklow

All viable candidates use the same SOD-923 package, ensuring mechanical compatibility.

Sourcing riskmedium

The strongest candidate, RB521CS-30, has an ambiguous MPN used by multiple vendors with different specs.

Can it be replaced directly?

Direct replacement for RB521C30 should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

Verify Slkor RB521CS-30 datasheet for a potential direct match. If unavailable, consider parametric alternatives like TPB02A40-923 if a 100mA current rating is acceptable.

Main risk

The primary risk is selecting a part with a lower current rating (100mA vs. 200mA), which could lead to device failure in the application.

Recommended alternatives

3
RB521CS-30 package
RB521CS-30

Slkor(SLKORMICRO Elec.)

Needs validationmedium risk

A potential pin-compatible alternative with matching key electricals, but requires datasheet verification due to MPN ambiguity across vendors.

View details

Alternative comparison matrix

Feature / factorRB521C30RB521CS-30TPB02A40-923RB520CM-40T2RCompatibility / risk
PackageSOD-923SOD-923SOD-923SOD-923SOD-923 — Package matches.; TPB02A40-923: Package matches.; RB520CM-40T2R: Package matches.
Voltage30V30V40V40V30V / 40V — Reverse voltage matches.; TPB02A40-923: Higher reverse voltage is an upgrade.; RB520CM-40T2R: Higher reverse voltage is an upgrade.
Current200mA200mA100mA100mA200mA / 100mA — Forward current matches.; TPB02A40-923: Current rating is a significant downgrade.; RB520CM-40T2R: Current rating is a significant downgrade.
Forward Voltage (Vf)0.35V @ 10mA0.35V @ 10mA0.35V @ 10mA0.71V @ 100mA0.35V @ 10mA / 0.71V @ 100mA — Forward voltage matches at test condition.; TPB02A40-923: Forward voltage matches at test condition.; RB520CM-40T2R: Higher forward voltage indicates greater loss.
ManufacturerWILLSEMISlkor--Slkor — Different manufacturer.

Application & sourcing insights

Questions & answers

Verified drop-in options for RB521C30 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.