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Best Alternatives to RB751V-40

Package: SC-76, SOD-323Yangjie TechnologyDiodes - Rectifiers - SingleSeries: -Package: Tape & Reel (TR)Voltage - DC Reverse (Vr) (Max): 40 VCurrent - Average Rectified (Io): 30mAVoltage - Forward (Vf) (Max) @ If: 370 mV @ 1 mA

Finding a substitute for the RB751V-40, a 40V 30mA small-signal Schottky diode in a SOD-323 package, requires careful comparison of electrical parameters. While several parts share the same package, key differences in leakage current and forward voltage present risks.

AI replacement insight

Electrical riskmedium

Candidates have different reverse leakage and forward voltage characteristics that must be validated for the application.

Package risklow

All promising candidates use the same SOD-323 package, ensuring physical compatibility.

Can it be replaced directly?

Direct replacement for RB751V-40 should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

BAT46WS is the most promising alternative, offering upgraded voltage and current ratings. However, its reverse leakage is higher and forward voltage must be verified.

Main risk

The primary risk is electrical mismatch, specifically higher reverse leakage current (Ir) and potentially different forward voltage (Vf) at low currents.

Recommended alternatives

2
BAT46WS package
BAT46WS

FUXINSEMI

Needs validationmedium risk

A potential pin-compatible alternative with higher voltage and current ratings, but requires electrical validation.

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Alternative comparison matrix

Feature / factorRB751V-40BAT46WSSD103AWSAlt 3Compatibility / risk
PackageSOD-323SOD-323SOD-323SOD-323 — Package matches.; SD103AWS: Package matches.
Voltage40V100V40V100V / 40V — Higher voltage rating provides more safety margin.; SD103AWS: Matches target, but offers no additional safety margin.
Current30mA150mA350mA150mA / 350mA — Higher current rating is a safe upgrade.; SD103AWS: Significantly higher current rating.
Reverse Leakage500nA @ 30V2uA @ 75V5uA @ 30V2uA @ 75V / 5uA @ 30V — Leakage is ~4x higher, may impact low-power or high-impedance circuits.; SD103AWS: Leakage is 10x higher, a significant downgrade.
Forward Voltage370mV @ 1mA0.25V @ 0.1mA (from ES)-0.25V @ 0.1mA (from ES) — Vf at low current appears promising but requires datasheet verification.

Application & sourcing insights

Questions & answers

Verified drop-in options for RB751V-40 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.