BAS21HT1G
onsemi
Needs validationlow risk
Directly equivalent high-voltage switching diode from onsemi in the same SOD-323 package.
Best Alternatives to BAS21H
BAS21H is a 250V, 200mA fast-switching diode in a compact SOD-323 package. This page provides verified alternatives and analyzes key parametric differences for a safe replacement in high-voltage switching circuits.
AI replacement insight
Electrical riskhigh
Mismatch in reverse recovery time (trr) or forward voltage (VF) can cause malfunction or thermal issues.
Package risklow
Many alternatives exist in the same SOD-323 package, ensuring physical compatibility.
Can it be replaced directly?
Direct replacement for BAS21H 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 BAS21H, then review parametric alternatives for package and electrical fit.
Main risk
The main risk is substituting with a standard rectifier (e.g., 1N4007WS) which has a much slower recovery time, causing circuit failure in fast switching applications.
Recommended alternatives
2Alternative comparison matrix
| Feature / factor | BAS21H | BAS21HT1G | ES1JLWS | Alt 3 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOD-323 | SOD-323 | SOD-323 | SOD-323 — Package matches, ensuring form and fit.; ES1JLWS: Package matches, ensuring form and fit. | |
| Voltage | 250V | 250V | 600V | 250V / 600V — Reverse voltage rating is identical.; ES1JLWS: Higher voltage rating provides more design margin. | |
| Current | 200mA | 200mA | 500mA | 200mA / 500mA — Forward current rating is identical.; ES1JLWS: Higher current rating provides more design margin. | |
| Speed | 50ns | < 50ns | 35ns | < 50ns / 35ns — Candidate is a fast switching diode, matching the target's function.; ES1JLWS: Faster recovery time is beneficial for switching performance. | |
| Forward Voltage | 1.25V | - | 1.68V | 1.68V — Higher forward voltage will increase power dissipation. |
Application & sourcing insights
Questions & answers
Verified drop-in options for BAS21H 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.