AC0603FR-0749K9L
Yageo
Needs validationhigh risk
Matches resistance and package but has significantly lower precision (1% tolerance, 100ppm TCR, Thick Film).
Best Alternatives to RT0603BRE0749K9L
RT0603BRE0749K9L is a 49.9 kΩ precision thin-film chip resistor in a 0603 package, featuring a tight ±0.1% tolerance and a low 50 ppm/°C TCR, ideal for precision circuits.
AI replacement insight
Electrical riskhigh
Replacing a precision resistor requires careful analysis of resistance, tolerance, and TCR changes.
Package risklow
Many 0603 resistors are available, ensuring physical compatibility is straightforward.
Can it be replaced directly?
No direct drop-in replacement has been identified; all candidates require review. Parametric alternatives with different resistance values but similar precision are available.
Best replacement path
Find a 0603 thin-film resistor with 49.9kΩ resistance, ≤0.1% tolerance, and ≤50ppm/°C TCR. If an exact resistance match is unavailable, select the closest value that the circuit can tolerate.
Main risk
The primary risk is substituting with a part that has a different resistance value or lower precision (worse tolerance/TCR), which can affect circuit accuracy and stability.
Recommended alternatives
4Alternative comparison matrix
| Feature / factor | RT0603BRE0749K9L | AC0603FR-0749K9L | RT0603BRD0745K3L | RT0603BRD0747K5L | Compatibility / risk |
|---|---|---|---|---|---|
| Resistance | 49.9 kΩ | 49.9 kΩ | 45.3 kΩ | 47.5 kΩ | 49.9 kΩ / 45.3 kΩ / 47.5 kΩ / 53.6 kΩ — Resistance value matches.; RT0603BRD0745K3L: Resistance is 9.2% lower.; RT0603BRD0747K5L: Resistance is 4.8% lower.; RT0603BRD0753K6L: Resistance is 7.4% higher. |
| Tolerance | 0.1% | 1% | 0.1% | 0.1% | 1% / 0.1% — Significantly wider tolerance, potential precision loss.; RT0603BRD0745K3L: Precision tolerance matches.; RT0603BRD0747K5L: Precision tolerance matches.; RT0603BRD0753K6L: Precision tolerance matches. |
| Tcr | 50 ppm/°C | ±100 ppm/°C | 25 ppm/°C | 25 ppm/°C | ±100 ppm/°C / 25 ppm/°C — Higher TCR, less stable over temperature.; RT0603BRD0745K3L: TCR is better (more stable).; RT0603BRD0747K5L: TCR is better (more stable).; RT0603BRD0753K6L: TCR is better (more stable). |
| Technology | Thin Film | Thick Film | Thin Film | Thin Film | Thick Film / Thin Film — Different technology, impacts stability and noise.; RT0603BRD0745K3L: Technology matches.; RT0603BRD0747K5L: Technology matches.; RT0603BRD0753K6L: Technology matches. |
| Package | 0603 | 0603 | 0603 | 0603 | 0603 — Package size matches.; RT0603BRD0745K3L: Package size matches.; RT0603BRD0747K5L: Package size matches.; RT0603BRD0753K6L: Package size matches. |
Application & sourcing insights
Questions & answers
The best alternatives are other 0603 thin-film resistors with similar precision specs (0.1% tolerance, ≤50ppm/°C TCR). Parts like RT0603BRD0747K5L (47.5kΩ) or RT0603BRD0753K6L (53.6kΩ) are close but require verifying if the resistance change is acceptable for your application.