US1M
MDD
Needs validationmedium risk
US1M may fit ES1J pads but needs recovery-time review.
Best Alternatives to ES1J
ES1J is a 600 V, 1 A SMA fast rectifier. Alternatives need checks for recovery time, package, and pin marking.
AI replacement insight
Electrical riskmedium
trr or VF may differ
Package riskmedium
ES2J has SMA/SMB conflict
Firmware risklow
discrete diode
Sourcing risklow
kept parts are active
Can it be replaced directly?
Direct replacement for ES1J should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.
Best replacement path
Start with US1M for same current, or ES2J if package dedupe confirms SMA.
Main risk
Recovery time and package conflicts can affect switching loss or PCB fit.
Recommended alternatives
3Alternative comparison matrix
| Feature / factor | ES1J | US1M | US2M | ES2J | Compatibility / risk |
|---|---|---|---|---|---|
| Package | DO-214AC SMA | DO-214AC SMA | - | - | SMA/SMB conflict — ES fields disagree |
| Pinout | 2 pins | 2 pins | - | - | 2 pins — pin functions not shown |
| Voltage | 600 V | 1000 V | - | - | 1000 V — higher VRRM |
| Current | 1 A | 1 A | - | - | 2 A — higher IF(AV) |
| Application | 35 ns fast rectifier | 75 ns cited | - | - | 75 ns cited — slower recovery |
Application & sourcing insights
Questions & answers
Verified drop-in options for ES1J 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.