Is there a pin-compatible replacement for RB521SM-30T2R?

Yes, parts like RB521SM-60T2R, RB521SM-40T2R, and RB520SM-30T2R use the same 2-pin SOD-523 package and are considered pin-compatible. However, electrical parameters like forward voltage should always be verified for your application.

What risks should I check before replacing RB521SM-30T2R?

The main risk is a potential increase in forward voltage (Vf) with some alternatives, which can affect power efficiency and heat dissipation. Always verify the candidate's Vf and ensure the reverse voltage rating meets or exceeds the original 30V requirement.

RB521SM-30T2R Alternatives, Datasheet & Cross Reference | ROHM

RB521SM-30T2R is a 30V, 200mA Schottky diode from ROHM in a compact SOD-523 package, ideal for rectification. Strong alternatives with higher voltage ratings from the same series are readily available.

AI replacement insight

Electrical risklow

Key parameters are well-matched or improved (voltage).

Package risklow

All viable candidates use the same SOD-523 package.

Sourcing risklow

Candidates are common parts from a major manufacturer.

Can it be replaced directly?

Yes, several direct replacements exist. RB521SM-40T2R is a strong candidate, offering a higher voltage margin in the same package.

Best replacement path

Upgrade to a higher voltage part from the same series, like RB521SM-40T2R or RB521SM-60T2R.

Main risk

Slight variations in forward voltage (Vf) across alternatives, which could impact circuit efficiency.

Recommended alternatives

A 40V rated alternative from the same ROHM series in the same SOD-523 package.

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Alternative comparison matrix

Feature / factor	RB521SM-30T2R	RB521SM-40T2R	RB521SM-60T2R	RB520SM-30T2R	Compatibility / risk
Package	SOD-523	SOD-523	SOD-523	SOD-523 (SC-79)	SOD-523 / SOD-523 (SC-79) — Package matches.; RB521SM-60T2R: Package matches.; RB520SM-30T2R: Package matches.
Voltage	30V	40V	60V	30V	40V / 60V / 30V — Higher reverse voltage provides more design margin.; RB521SM-60T2R: Higher reverse voltage provides more design margin.; RB520SM-30T2R: Reverse voltage rating matches.
Current	200mA	200mA	200mA	200mA	200mA — Forward current rating matches.; RB521SM-60T2R: Forward current rating matches.; RB520SM-30T2R: Forward current rating matches.
Forward Voltage	0.47V	0.54V	0.6V	0.58V	0.54V / 0.6V / 0.58V — Higher Vf may increase conduction losses.; RB521SM-60T2R: Higher Vf may increase conduction losses.; RB520SM-30T2R: Higher Vf will increase conduction losses.

Application & sourcing insights

Questions & answers

RB521SM-60T2R and RB521SM-40T2R are excellent alternatives from the same ROHM series, offering higher reverse voltage (60V and 40V) in the same package. They are strong candidates for a robust replacement.