AC0402FR-0749R9L
Yageo
Needs validationlow risk
Excellent alternative with matching resistance, tolerance, package, and AEC-Q200 qualification.
Best Alternatives to CRCW040249R9FKED
Find and compare substitutes for the Vishay CRCW040249R9FKED, a 49.9Ω 1% 0402 AEC-Q200 resistor. This guide reviews pin-compatible and parametric alternatives, highlighting key differences in qualification, tolerance, and power.
AI replacement insight
Electrical riskhigh
Using a part with wider tolerance or different technology can impact circuit performance.
Package risklow
All candidates use the same 0402 package, ensuring physical compatibility.
Sourcing riskhigh
Failure to match AEC-Q200 qualification can lead to component failure in harsh environments.
Can it be replaced directly?
Direct replacement for CRCW040249R9FKED should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.
Best replacement path
The Yageo AC0402FR-0749R9L is the strongest alternative, matching all key parameters including AEC-Q200 qualification.
Main risk
The primary risk is substituting with a non-AEC-Q200 part for an automotive design, or using a part with wider tolerance (e.g., 5%) where 1% precision is required.
Recommended alternatives
3Alternative comparison matrix
| Feature / factor | CRCW040249R9FKED | AC0402FR-0749R9L | RT0402BRD0749R9L | RTT0249R9FTH | Compatibility / risk |
|---|---|---|---|---|---|
| Package | 0402 | 0402 | 0402 | 0402 | 0402 — Identical package and pinout.; RT0402BRD0749R9L: Identical package.; RTT0249R9FTH: Identical package. |
| Resistance | 49.9 Ω | 49.9 Ω | - | 49.9 Ω | 49.9 Ω — Resistance value matches.; RTT0249R9FTH: Resistance value matches. |
| Tolerance | 1.0% | 1.0% | 0.1% | 1.0% | 1.0% / 0.1% — Tolerance matches.; RT0402BRD0749R9L: Tighter tolerance is an upgrade.; RTT0249R9FTH: Tolerance matches. |
| Power | 0.063 W | 0.0625 W | - | - | 0.0625 W — Slightly lower power rating, difference is negligible (<1%). |
| Application | AEC-Q200 | AEC-Q200 | Not specified | Not specified | AEC-Q200 / Not specified — Both parts are AEC-Q200 qualified.; RT0402BRD0749R9L: Candidate is not AEC-Q200 qualified.; RTT0249R9FTH: Candidate is not AEC-Q200 qualified. |
| Tcr | ±100 ppm/K | ±100 ppm/°C | 25 ppm/°C | Not specified | ±100 ppm/°C / 25 ppm/°C / Not specified — Temperature coefficient matches.; RT0402BRD0749R9L: Lower TCR is a significant upgrade.; RTT0249R9FTH: TCR is not specified in provided data. |
| Technology | Thick Film | - | Thin Film | - | Thin Film — Different technology may affect pulse/noise performance. |
Application & sourcing insights
Questions & answers
Verified drop-in options for CRCW040249R9FKED 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.