Is there a pin-compatible replacement for MFR-25FBF52-49R9?

Yes, several axial resistors like MF3WS-51Ω±1%T and MF2WS-51Ω±1% T are form-fit compatible. While they share the same package, electrical parameters like TCR may differ, requiring engineering verification.

What risks should I check before replacing MFR-25FBF52-49R9?

Key risks include changes in resistance tolerance, temperature coefficient (TCR), and technology type. A wider tolerance can affect circuit precision, a different TCR impacts stability, and changing to wirewound can add inductance.

MFR-25FBF52-49R9 Alternatives, Datasheet & Cross Reference | Yageo

Finding a substitute for the Yageo MFR-25FBF52-49R9 49.9Ω 1% resistor involves matching its axial package and key electrical parameters. Alternatives exist with higher power ratings but may have different tolerance or temperature coefficients requiring review.

AI replacement insight

Electrical riskmedium

Substitutes may have different TCR, tolerance, or technology (e.g., wirewound inductance).

Package risklow

Multiple candidates match the axial through-hole package, but lead spacing/body size should be confirmed.

Sourcing risklow

This is a common resistor value with many potential cross-vendor options available.

Can it be replaced directly?

There is no verified direct drop-in replacement. However, parts like MF3WS-51Ω±1%T are strong functional alternatives in the same axial package that require engineering review of the temperature coefficient.

Best replacement path

Prioritize axial metal film resistors with a power rating of at least 1.5W, resistance near 49.9Ω, and 1% tolerance. MF3WS-51Ω±1%T is a good starting point for evaluation.

Main risk

The primary risk is performance degradation from substitutes with a wider resistance tolerance or a higher Temperature Coefficient (TCR), affecting circuit precision and stability.

Recommended alternatives

A 3W power upgrade in the same axial package, but with a higher temperature coefficient (TCR) requiring review.

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Alternative comparison matrix

Feature / factor	MFR-25FBF52-49R9	MF3WS-51Ω±1%T	MF2WS-51Ω±1% T	MOF3WS-47Ω±5% T	Compatibility / risk
Package	Axial	Axial	Axial	Axial	Axial — Form-fit match.; MF2WS-51Ω±1% T: Form-fit match.; MOF3WS-47Ω±5% T: Form-fit match.
Resistance	49.9 Ω	51.0 Ω	51.0 Ω	47.0 Ω	51.0 Ω / 47.0 Ω — Within 2.2% of target.; MF2WS-51Ω±1% T: Within 2.2% of target.; MOF3WS-47Ω±5% T: Within 6% of target.
Power	1.0 W	3.0 W	2.0 W	3.0 W	3.0 W / 2.0 W — Significant power upgrade.; MF2WS-51Ω±1% T: Power upgrade.; MOF3WS-47Ω±5% T: Significant power upgrade.
Tolerance	±1%	±1%	-	±5%	±1% / ±5% — Matches precision requirement.; MOF3WS-47Ω±5% T: Significant downgrade from ±1%.
Tcr	±100 ppm/°C	±200 PPM/°C	Missing	-	±200 PPM/°C / Missing — Worse stability over temperature.; MF2WS-51Ω±1% T: Must be verified from datasheet.
Technology	Metal Film	-	-	Metal Oxide Film	Metal Oxide Film — Different technology may have different performance characteristics.

Application & sourcing insights

Questions & answers

MF3WS-51Ω±1%T is a strong alternative, offering a higher 3W power rating in the same axial package with similar resistance and tolerance. However, its temperature coefficient (TCR) is higher and should be reviewed.