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Best Alternatives to RB751S40T5G

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

RB751S40T5G is a 30V, 30mA Schottky diode in a compact SOD-523 package, designed for high-speed switching. When seeking alternatives, prioritize parts with equal or better voltage/current ratings and closely matched capacitance and reverse leakage.

AI replacement insight

Electrical riskmedium

Must verify capacitance, leakage (IR), and forward voltage (VF) to ensure performance is not degraded.

Package risklow

The SOD-523 package is standard, and multiple candidates match the form factor.

Sourcing risklow

Multiple vendors produce similar Schottky diodes in this package type.

Can it be replaced directly?

Direct replacement for RB751S40T5G should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

The most promising replacement is RB751S40T1G, which belongs to the same onsemi product family and offers a higher voltage rating (40V) with otherwise matching key parameters.

Main risk

The primary risk is substituting with a part that has higher capacitance or reverse leakage, which can degrade performance in high-frequency or low-power circuits.

Recommended alternatives

3
RB751S40T1G package
RB751S40T1G

FUXINSEMI

Needs validationlow risk

A strong pin-compatible alternative with a higher voltage rating (40V vs 30V) and matching key electricals.

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Alternative comparison matrix

Feature / factorRB751S40T5GRB751S40T1GNSR0240V2T1GSD103AWTCompatibility / risk
PackageSOD-523SOD-523SOD-523SOD-523SOD-523 — Package matches, enabling form-fit compatibility.; NSR0240V2T1G: Package matches.; SD103AWT: Package matches.
Voltage30V40V40V40V40V — Higher reverse voltage provides more design margin.; NSR0240V2T1G: Higher reverse voltage.; SD103AWT: Higher reverse voltage.
Current30mA30mA250mA350mA30mA / 250mA / 350mA — Forward current rating matches the target.; NSR0240V2T1G: Higher forward current.; SD103AWT: Significantly higher forward current.
Diode TypeSchottkySchottky--Schottky — Diode type matches, ensuring similar electrical behavior.
Reverse Leakage~0.3uA-10uA-10uA — Much higher reverse leakage is a risk for low-power designs.
Capacitance~2pF--50pF50pF — Much higher capacitance will impact high-speed performance.

Application & sourcing insights

Questions & answers

Verified drop-in options for RB751S40T5G 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.