Is there a pin-compatible replacement for RT0402BRD0749R9L?

Yes, many 0402 chip resistors are pin-compatible in form factor. However, for a precision part like RT0402BRD0749R9L, you must also match electricals like resistance, tolerance, and TCR. RT0402BRE0749R9L is a pin-compatible option that requires review of its TCR.

What risks should I check before replacing RT0402BRD0749R9L?

Key risks include changes in circuit accuracy due to different resistance tolerance (target is ±0.1%), and performance drift with temperature if the replacement has a higher TCR (target is 25 ppm/°C). Also verify the replacement's technology (thin film vs. thick film) as it affects noise and stability.

RT0402BRD0749R9L Alternatives, Datasheet & Cross Reference | Yageo

RT0402BRD0749R9L is a precision 49.9 Ohm thin-film resistor from Yageo in a 0402 package, featuring a tight ±0.1% tolerance and a stable 25 ppm/°C TCR, ideal for precision circuits.

AI replacement insight

Electrical riskhigh

Using a thick film or high-TCR part will compromise circuit accuracy and stability.

Package risklow

The 0402 package is standardized, so physical fit is not a concern.

Can it be replaced directly?

No exact drop-in replacement is listed. RT0402BRE0749R9L is the closest candidate but has a weaker TCR (50 ppm/°C), which requires engineering review for the specific application.

Best replacement path

The ideal replacement is another 0402 thin-film resistor with 49.9Ω resistance, ≤±0.1% tolerance, and a TCR of ≤25 ppm/°C.

Main risk

The primary risk is a degradation of circuit precision and thermal stability if a replacement with looser tolerance or a higher TCR is used.

Recommended alternatives

A very close alternative from the same manufacturer, but with a weaker TCR that requires review.

View details

Alternative comparison matrix

Feature / factor	RT0402BRD0749R9L	RT0402BRE0749R9L	RTT0249R9FTH	Compatibility / risk
Package	0402	0402	0402	0402 — Same physical size and land pattern.; RTT0249R9FTH: Same physical size and land pattern.
Resistance	49.9 Ω	49.9 Ω	49.9 Ω	49.9 Ω — Resistance value is identical.; RTT0249R9FTH: Resistance value is identical.
Tolerance	±0.1%	±0.1%	±1%	±0.1% / ±1% — Precision tolerance is identical.; RTT0249R9FTH: Tolerance is 10x looser.
Tcr	25 ppm/°C	50 ppm/°C	-	50 ppm/°C — Candidate has worse thermal stability.
Technology	Thin Film	Thin Film	Thick Film	Thin Film / Thick Film — Both are precision thin film resistors.; RTT0249R9FTH: Candidate is a general purpose part, not precision.

Application & sourcing insights

Questions & answers

The best alternative is another precision thin-film resistor with matching 49.9Ω resistance, ±0.1% tolerance, and a TCR of 25 ppm/°C or better. RT0402BRE0749R9L is very close but has a slightly higher TCR that must be reviewed.