AC0603FR-074R99L
Yageo
Needs validationmedium risk
An AEC-Q200 qualified upgrade with matching specs, but requires engineering review of its power rating.
Best Alternatives to RS-03L4R99FT
RS-03L4R99FT is a 0603 thick film resistor with 4.99Ω resistance and 1% tolerance. Several alternatives exist with matching core parameters, but require engineering review of power dissipation requirements.
AI replacement insight
Electrical riskmedium
Power rating is identical, not increased. Requires verification of in-circuit power dissipation and derating.
Package risklow
All suggested alternatives use the same 0603 package.
Can it be replaced directly?
Yes, several manufacturers offer 0603, 4.99Ω, 1% resistors like Yageo RC0603FR-074R99L and FOJAN FRC0603F4R99TS. While they match key specs, their power rating is identical, not increased, so verification is essential.
Best replacement path
The best upgrade path is Yageo's AC0603FR-074R99L, which is AEC-Q200 qualified. For a general replacement, Yageo's RC0603FR-074R99L is a strong candidate. Both require power dissipation review.
Main risk
The main risk is thermal. The suggested alternatives have the same power rating as the original part, lacking an additional safety margin. Engineers must confirm the actual power dissipation in the circuit is well within the component's limits.
Recommended alternatives
4Alternative comparison matrix
| Feature / factor | RS-03L4R99FT | AC0603FR-074R99L | 0603WAF499KT5E | FRC0603F4R99TS | Compatibility / risk |
|---|---|---|---|---|---|
| Package | 0603 | 0603 | 0603 | 0603 | 0603 — Same EIA package.; 0603WAF499KT5E: Same EIA package.; FRC0603F4R99TS: Same EIA package.; RC0603FR-074R99L: Same EIA package. |
| Resistance | 4.99 Ω | 4.99 Ω | 4.99 Ω | 4.99 Ω | 4.99 Ω — Identical resistance.; 0603WAF499KT5E: Identical resistance.; FRC0603F4R99TS: Identical resistance.; RC0603FR-074R99L: Identical resistance. |
| Application | General Purpose | AEC-Q200 | - | - | AEC-Q200 — Automotive grade is an upgrade over general purpose. |
| Power | 0.1W | 0.1W | 0.1W | 0.1W | 0.1W — Identical power rating; does not meet recommended 1.5x safety margin. Review required.; 0603WAF499KT5E: Identical power rating; does not meet recommended 1.5x safety margin. Review required.; FRC0603F4R99TS: Identical power rating; does not meet recommended 1.5x safety margin. Review required.; RC0603FR-074R99L: Identical power rating; does not meet recommended 1.5x safety margin. Review required. |
| Tcr | ±250 ppm/°C | ±200 ppm/°C | ±100 ppm/°C | ±100 ppm/°C | ±200 ppm/°C / ±100 ppm/°C — Improved temperature stability.; 0603WAF499KT5E: Significantly improved temperature stability.; FRC0603F4R99TS: Significantly improved temperature stability.; RC0603FR-074R99L: Improved temperature stability. |
| Tolerance | ±1% | - | ±1% | ±1% | ±1% — Identical tolerance.; FRC0603F4R99TS: Identical tolerance.; RC0603FR-074R99L: Identical tolerance. |
Application & sourcing insights
Questions & answers
Yageo's AC0603FR-074R99L is a strong automotive-grade upgrade. For a standard replacement, Yageo's RC0603FR-074R99L is a good option. Both have matching resistance, tolerance, and package, but require power dissipation review.