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Best Alternatives to 1N5821RLG

Package: DO-201AA, DO-27, AxialonsemiDiodes - Rectifiers - SinglePackage: Tape & Reel (TR); Cut Tape (CT)Voltage - DC Reverse (Vr) (Max): 30 VCurrent - Average Rectified (Io): 3AVoltage - Forward (Vf) (Max) @ If: 500 mV @ 3 ACurrent - Reverse Leakage @ Vr: 2 mA @ 30 V

The 1N5821RLG is a popular 30V, 3A Schottky rectifier in a DO-201AD package, valued for its low forward voltage and high efficiency. Several pin-compatible alternatives are available, offering higher voltage or current ratings, but careful review of their forward voltage is crucial to ensure performance is not compromised.

AI replacement insight

Electrical riskmedium

Most alternatives have higher forward voltage, impacting efficiency and thermals.

Package risklow

The DO-201AD package is common, and many candidates match the form factor.

Can it be replaced directly?

Direct replacement for 1N5821RLG should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

Start with Datasheet verified or Strong match candidates for 1N5821RLG, then review parametric alternatives for package and electrical fit.

Main risk

The primary risk when replacing 1N5821RLG is selecting a part with a higher forward voltage (Vf), which increases power dissipation and reduces circuit efficiency.

Recommended alternatives

3
MBR360G package
MBR360G

onsemi

Needs validationlow risk

Pin-compatible Schottky diode from the same manufacturer with a higher voltage rating.

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Alternative comparison matrix

Feature / factor1N5821RLGMBR360GSR560SR5100Compatibility / risk
PackageDO-201AD (Axial)DO-201ADDO-201ADDO-201ADDO-201AD — Physically compatible.; SR560: Physically compatible.; SR5100: Physically compatible.
Diode TypeSchottkySchottkySchottkySchottkySchottky — Same diode technology.; SR560: Same diode technology.; SR5100: Same diode technology.
Voltage30V60V60V100V60V / 100V — Higher voltage rating provides more margin.; SR560: Higher voltage rating provides more margin.; SR5100: Significantly higher voltage rating.
Current3A3A5A5A3A / 5A — Current rating is identical.; SR560: Higher current rating provides more margin.; SR5100: Higher current rating.
Forward Voltage0.5V @ 3A0.74V @ 3A0.7V @ 5A0.85V @ 5A0.74V @ 3A / 0.7V @ 5A / 0.85V @ 5A — Higher Vf increases power loss.; SR560: Higher Vf increases power loss. Check value at 3A.; SR5100: Significantly higher Vf will greatly increase power loss.

Application & sourcing insights

Questions & answers

Verified drop-in options for 1N5821RLG 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.