ECSR2512FR001K9
RESI
Needs validationlow risk
An excellent upgrade with a higher 3W power rating and a much lower TCR for improved stability.
Best Alternatives to WSL25121L000FEA18
Vishay's WSL25121L000FEA18 is a 2W, 1mΩ, 1% tolerance current sense resistor in a 2512 package. Several alternatives are available, including direct power upgrades and parametrically similar options from other vendors.
AI replacement insight
Electrical riskmedium
Risk is medium for 2W replacements due to power margin; low for 3W upgrades.
Package risklow
All suggested alternatives are in the same 2512 package.
Sourcing risklow
Multiple vendors offer suitable alternatives, reducing sourcing risk.
Can it be replaced directly?
Yageo's PA2512FKE7W0R001E offers nearly identical specs with an improved TCR, but requires verification of the 2W power rating in your application.
Best replacement path
Upgrade to a 3W rated part like TAI-TECH RLP25FEGR001 or Milliohm HoLLR2512-3W-1mR-1% for increased power margin and improved TCR.
Main risk
The main risk is insufficient power derating if selecting a 2W alternative. The original part may have been operating close to its limit.
Recommended alternatives
5Alternative comparison matrix
| Feature / factor | WSL25121L000FEA18 | ECSR2512FR001K9 | HoLLR2512-3W-1mR-1% | RLP25FEGR001 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | 2512 | 2512 | 2512 | 2512 | 2512 — Identical package and pin count.; HoLLR2512-3W-1mR-1%: Identical package and pin count.; RLP25FEGR001: Identical package and pin count.; HoYLR2512-2W-1mR-1%: Identical package and pin count. |
| Power | 2.0W | 3.0W | 3.0W | 3.0W | 3.0W / 2.0W — Higher power rating provides more design margin.; HoLLR2512-3W-1mR-1%: Higher power rating provides more design margin.; RLP25FEGR001: Higher power rating provides more design margin.; HoYLR2512-2W-1mR-1%: Power rating matches, but lacks recommended safety margin. |
| Resistance | 1mΩ | 1mΩ | 1mΩ | 1mΩ | 1mΩ — Resistance matches target.; HoLLR2512-3W-1mR-1%: Resistance matches target.; RLP25FEGR001: Resistance matches target.; HoYLR2512-2W-1mR-1%: Resistance matches target. |
| Tcr | ±275 ppm/°C | ±100 ppm/℃ | ≤100ppm/°C | ±50 ppm/℃ | ±100 ppm/℃ / ≤100ppm/°C / ±50 ppm/℃ / ±100ppm/℃ — TCR is significantly better.; HoLLR2512-3W-1mR-1%: TCR is significantly better.; RLP25FEGR001: TCR is significantly better, ensuring higher stability.; HoYLR2512-2W-1mR-1%: TCR is significantly better. |
| Tolerance | ±1% | - | - | ±1% | ±1% — Tolerance matches target. |
Application & sourcing insights
Questions & answers
Verified drop-in options for WSL25121L000FEA18 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.