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Best Alternatives to RB751S40T1G

Package: SC-79, SOD-523onsemiDiodes - Rectifiers - SinglePackage: Tape & Reel (TR); Cut Tape (CT); Digi-Reel®Voltage - DC Reverse (Vr) (Max): 30 VCurrent - Average Rectified (Io): 30mAVoltage - Forward (Vf) (Max) @ If: 370 mV @ 1 mACurrent - Reverse Leakage @ Vr: 500 nA @ 30 V

RB751S40T1G is a low-current, low-VF Schottky diode from onsemi in a SOD-523 package, ideal for high-speed switching. Finding a replacement requires careful matching of forward voltage, reverse leakage, and capacitance.

AI replacement insight

Electrical riskmedium

Many alternatives have higher VF, IR, or CT, impacting performance.

Package risklow

The SOD-523 package is common, ensuring mechanical compatibility.

Can it be replaced directly?

No exact drop-in replacement is confirmed. NSR0240V2T1G is the closest functional match, but requires review of forward voltage and capacitance.

Best replacement path

The onsemi NSR0240V2T1G is a strong functional alternative with similar characteristics.

Main risk

The primary risk is selecting a substitute with higher forward voltage (VF), reverse leakage (IR), or capacitance (CT), which can degrade circuit efficiency and speed.

Recommended alternatives

3
NSR0240V2T1G package
NSR0240V2T1G

onsemi

Needs validationlow risk

A strong functional alternative from the same manufacturer with very similar electrical characteristics.

View details

Alternative comparison matrix

Feature / factorRB751S40T1GNSR0240V2T1GBAT54KFILMSD103AWTCompatibility / risk
PackageSOD-523SOD-523SOD-523SOD-523SOD-523 — Same package and pin count.; BAT54KFILM: Same package and pin count.; SD103AWT: Same package and pin count.
Voltage40V40V40V40V40V — Same reverse voltage rating.; BAT54KFILM: Same reverse voltage rating.; SD103AWT: Same reverse voltage rating.
Current30mA250mA300mA350mA250mA / 300mA / 350mA — Higher current rating is acceptable.; BAT54KFILM: Higher current rating is acceptable.; SD103AWT: Higher current rating is acceptable.
Vf0.28V @ 1mA480mV @ 100mA900mV @ 100mA>0.37V480mV @ 100mA / 900mV @ 100mA / >0.37V — Higher forward voltage.; BAT54KFILM: Much higher forward voltage, not suitable for low-VF applications.; SD103AWT: Significantly higher forward voltage.
Ir0.3µA0.2µA-5µA0.2µA / 5µA — Similar reverse leakage.; SD103AWT: Much higher reverse leakage current.
Ct2pF4pF7pF50pF4pF / 7pF / 50pF — Slightly higher capacitance.; BAT54KFILM: Higher capacitance.; SD103AWT: Much higher capacitance, affects switching speed.

Application & sourcing insights

Questions & answers

The onsemi NSR0240V2T1G is a strong functional alternative in the same package, offering similar performance with minor differences in forward voltage and capacitance.