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Best Alternatives to S1B

Package: DO-214AC (SMA)MDD(Microdiode Semiconductor)Discrete Semiconductor ProductsReverse Voltage (Vr): 100 VAverage Forward Rectified Current (Io): 1 AForward Voltage (Vf): 1.1 VReverse Leakage Current (Ir): 5 µAPeak Forward Surge Current (Ifsm): 30 A

The MDD S1B is a standard 1A, 100V general-purpose rectifier in a compact DO-214AC (SMA) package. It is widely used for rectification in power supplies, inverters, and freewheeling applications.

AI replacement insight

Package risklow

DO-214AC (SMA) is a standard, widely available package.

Electrical riskmedium

Verify forward voltage (Vf) and recovery time (Trr) to match application needs.

Sourcing risklow

This is a high-volume, multi-source component type.

Can it be replaced directly?

Direct replacement for S1B should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

Cross-reference to other 'S1' or 'RS1' series rectifiers in SMA packages, like the Bourns CD214A-RS1K.

Main risk

The main risks involve mismatches in forward voltage (Vf), affecting power efficiency, and reverse recovery time (Trr), which is critical for switching applications.

Recommended alternatives

2
S2Y package
S2Y

LGE

Needs validationmedium risk

A form-fit alternative with much higher voltage and current ratings; electrical suitability needs review.

View details

Alternative comparison matrix

Feature / factorS1BCD214A-RS1KS2YES2GCompatibility / risk
PackageDO-214AC (SMA)DO-214AC(SMA)SMA/DO-214ACDO-214AC (SMA)DO-214AC(SMA) / SMA/DO-214AC / DO-214AC (SMA) — Package matches target.; S2Y: Package matches target.; ES2G: Package matches target.
Voltage100V800V2000V400V800V / 2000V / 400V — Higher voltage rating provides more design margin.; S2Y: Significantly higher voltage rating.; ES2G: Higher voltage rating.
Current1A1A2A2A1A / 2A — Current rating matches target.; S2Y: Higher current rating.; ES2G: Higher current rating.
Forward Voltage1.1V @ 1A1.3V @ 1A--1.3V @ 1A — Slightly higher Vf may increase power dissipation.
Recovery TimeStandard (2µs)Standard (2µs)-Fast Recovery (35ns)Standard (2µs) / Fast Recovery (35ns) — Standard recovery time matches target type.; ES2G: Much faster than target's standard recovery.

Application & sourcing insights

Questions & answers

Verified drop-in options for S1B 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.