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Best Alternatives to 1SS400

Package: SC-79, SOD-523Yangjie TechnologyDiodes - Rectifiers - SingleSeries: -Package: Tape & Reel (TR)Voltage - DC Reverse (Vr) (Max): 80 VCurrent - Average Rectified (Io): 100mAVoltage - Forward (Vf) (Max) @ If: 1.2 V @ 100 mA

1SS400 is a high-speed switching diode (80V, 100mA, 4ns) in a compact SOD-523 package. This page reviews potential alternatives, focusing on electrical and mechanical compatibility for high-speed applications.

AI replacement insight

Electrical risklow

Voltage rating varies by MFR; must verify it is >=80V. Current is higher, which is safe.

Package risklow

Top candidates use the same SOD-523 package. Pinout is standard but should be confirmed.

Sourcing risklow

Candidates like BAS516 and 1N4148WT are widely available from multiple manufacturers.

Can it be replaced directly?

Direct replacement for 1SS400 should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

BAS516 (from FUXINSEMI or Slkor) and 1N4148WT (from Yangjie) offer matching packages and upgraded voltage/current ratings.

Main risk

The main risk is selecting a version of a candidate part with a lower voltage rating (e.g., 75V) than the target's 80V.

Recommended alternatives

2
1N4148WT package
1N4148WT

Diotec Semiconductor

Needs validationlow risk

A common high-speed diode in the same SOD-523 package. Verify manufacturer datasheet for voltage rating.

View details

Alternative comparison matrix

Feature / factor1SS4001N4148WTBAS516Alt 3Compatibility / risk
PackageSOD-523SOD-523SOD-523SOD-523 — Package matches target.; BAS516: Package matches target.
Voltage80V75V to 100V75V to 100V75V to 100V — Rating varies by MFR. Some are below target's 80V.; BAS516: Rating varies by MFR. Some are below target's 80V.
Current100mA125mA-150mA250mA125mA-150mA / 250mA — Higher current rating is a safe upgrade.; BAS516: Higher current rating is a safe upgrade.
Trr4ns4ns4ns4ns — Reverse recovery time matches.; BAS516: Reverse recovery time matches.

Application & sourcing insights

Questions & answers

Verified drop-in options for 1SS400 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.