Is there a pin-compatible replacement for RB520SM-30T2R?

Yes, RB521SM-30T2R and RB521SM-40T2R are considered pin-compatible replacements. They are from the same manufacturer in the identical SOD-523 package, but it is always best practice to verify the datasheet.

What risks should I check before replacing RB520SM-30T2R?

Before replacing, check the forward voltage (Vf) and reverse leakage current (Ir). A different Vf can alter power dissipation, while a higher Ir could affect low-power standby circuits. The suggested alternatives have comparable or better specs, minimizing risk.

RB520SM-30T2R Alternatives, Datasheet & Cross Reference | ROHM

Finding a substitute for the ROHM RB520SM-30T2R Schottky diode is straightforward. This 30V, 200mA diode in a SOD-523 package has several excellent alternatives within the same ROHM product family that offer matched or improved performance.

AI replacement insight

Electrical risklow

Candidates have matched or improved electrical ratings. Vf differences are small.

Package risklow

All candidates use the same SOD-523 package, ensuring form and fit compatibility.

Can it be replaced directly?

Yes, RB521SM-40T2R and RB521SM-30T2R are strong candidates for direct replacement, sharing the same package and key ratings.

Best replacement path

The best replacement is RB521SM-40T2R, offering a higher voltage rating (40V vs 30V) and lower forward voltage for better performance.

Main risk

The main risk is a change in forward voltage (Vf), which can affect power dissipation and circuit efficiency. All suggested parts have low risk.

Recommended alternatives

Strong upgrade with higher voltage rating and lower forward voltage in the same package.

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Alternative comparison matrix

Feature / factor	RB520SM-30T2R	RB521SM-40T2R	RB521SM-30T2R	RB521SM-60T2R	Compatibility / risk
Package	SOD-523 (SC-79)	SOD-523	SOD-523	SOD-523	SOD-523 — Same package family ensures form-fit compatibility.; RB521SM-30T2R: Same package family ensures form-fit compatibility.; RB521SM-60T2R: Same package family ensures form-fit compatibility.
Voltage	30V	40V	30V	60V	40V / 30V / 60V — Higher reverse voltage provides increased design margin.; RB521SM-30T2R: Reverse voltage rating is identical.; RB521SM-60T2R: Higher reverse voltage provides increased design margin.
Current	200mA	200mA	200mA	200mA	200mA — Forward current rating is identical.; RB521SM-30T2R: Forward current rating is identical.; RB521SM-60T2R: Forward current rating is identical.
Forward Voltage	0.58V	0.54V @ 200mA	0.47V @ 200mA	0.60V @ 200mA	0.54V @ 200mA / 0.47V @ 200mA / 0.60V @ 200mA — Lower forward voltage improves efficiency.; RB521SM-30T2R: Significantly lower forward voltage improves efficiency.; RB521SM-60T2R: Slightly higher Vf may increase power loss.

Application & sourcing insights

Questions & answers

The best alternative is RB521SM-40T2R. It offers a higher reverse voltage (40V vs 30V) and a lower forward voltage (0.54V vs 0.58V), making it a robust, more efficient upgrade in the same package.