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Best Alternatives to S1G

Package: DO-214AC/SMATWGMCDiodesReverse Voltage (Vr): 400 VAverage Forward Current: 1.0 AForward Voltage (Vf): 1.10 VPeak Forward Surge Current: 30 AReverse Leakage Current: 5 uA

The S1G is a standard 1A, 400V general-purpose rectifier in a common SMA package. Finding a suitable replacement involves matching these core parameters and ensuring the diode type is also standard recovery.

AI replacement insight

Electrical riskmedium

Mismatched diode recovery time (fast vs. standard) or forward voltage can impact performance.

Package risklow

The SMA (DO-214AC) package is standardized, minimizing physical compatibility issues.

Can it be replaced directly?

Direct replacement for S1G should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

S1J offers a direct, upgraded-voltage replacement. S3MA is a higher-power upgrade. Avoid fast-recovery diodes like US1G unless the application can tolerate potential side effects.

Main risk

The main risk is substituting with a fast-recovery diode instead of a standard one, which can cause unexpected circuit behavior like ringing.

Recommended alternatives

2
S1J package
S1J

TWGMC

Needs validationlow risk

A strong, pin-compatible alternative in the same package with a higher voltage rating for increased design margin.

View details

Alternative comparison matrix

Feature / factorS1GS1JS3MAUS1GCompatibility / risk
PackageDO-214AC/SMADO-214AC/SMADO-214AC (SMA)DO-214AC, SMADO-214AC/SMA / DO-214AC (SMA) / DO-214AC, SMA — Package matches target.; S3MA: Package matches target.; US1G: Package matches target.
Voltage400V600V1000V1.3V600V / 1000V / 1.3V — Higher voltage rating provides more margin.; S3MA: Significantly higher voltage rating.; US1G: Higher forward voltage increases power loss.
Current1.0A1.0A3.0A-1.0A / 3.0A — Average forward current matches.; S3MA: Higher current rating.
ApplicationGeneral RectifierStandard Recovery1.1V@3AUltrafast (50ns)Standard Recovery / 1.1V@3A / Ultrafast (50ns) — Diode type matches target.; S3MA: Vf at 1A likely lower, which is good.; US1G: Mismatched diode type may cause ringing.

Application & sourcing insights

Questions & answers

Verified drop-in options for S1G 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.