VMS-R100-1.0-U
Isabellenhuette USA
Needs validationlow risk
Upgrade path with higher power rating (4W vs 3W) and tighter TCR in the same 2512 package.
Best Alternatives to LR123WF400NT4E
Find pin-compatible and upgrade alternatives for the LR123WF400NT4E, a 3W, 100mΩ, 2512 current sense resistor. Key parameters to check include power rating, TCR, and land pattern.
AI replacement insight
Electrical risklow
Multiple candidates match key electrical specs.
Package risklow
2512 is a standard package, but land patterns can vary slightly.
Can it be replaced directly?
Direct replacement for LR123WF400NT4E should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.
Best replacement path
RLP25FEGR100 by TAI-TECH offers a direct pin-to-pin match. For an upgrade, consider VMS-R100-1.0-U from Isabellenhuette for higher power handling.
Main risk
The main risk is minor variations in land pattern dimensions and pulse withstanding capability between manufacturers.
Recommended alternatives
3Alternative comparison matrix
| Feature / factor | LR123WF400NT4E | VMS-R100-1.0-U | HoLLR2512-3W-100mR-1% | RLP25FEGR100 | Compatibility / risk |
|---|---|---|---|---|---|
| Power | 3.0W | 4.0W | 3.0W | 3.0W | 4.0W / 3.0W — Higher power rating provides more design margin.; HoLLR2512-3W-100mR-1%: matched; RLP25FEGR100: matched |
| Tcr | ±50 PPM/°C | <20 ppm/K | ±50ppm/°C | ±50 ppm/℃ | <20 ppm/K / ±50ppm/°C / ±50 ppm/℃ — Tighter TCR improves measurement stability over temperature.; HoLLR2512-3W-100mR-1%: matched; RLP25FEGR100: matched |
| Package | 2512 | 2512 (6432 Metric) | 2512 | 2512 | 2512 (6432 Metric) — Package size matches, enabling physical drop-in.; HoLLR2512-3W-100mR-1%: matched; RLP25FEGR100: matched |
| Resistance | 0.1 Ohm | 0.1 Ohm | 0.1 Ohm | 0.1 Ohm | 0.1 Ohm — matched; HoLLR2512-3W-100mR-1%: matched; RLP25FEGR100: matched |
| Tolerance | ±1.0% | ±1.0% | - | ±1.0% | ±1.0% — matched; RLP25FEGR100: matched |
Application & sourcing insights
Questions & answers
Verified drop-in options for LR123WF400NT4E 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.