Is there a pin-compatible replacement for PTFR0805B49R9N9?

Several 0805 package resistors like ARG05BTC49R9 are form-fit compatible, but none are verified as direct drop-in replacements. All reviewed options have parametric differences in power or TCR that require circuit analysis.

What risks should I check before replacing PTFR0805B49R9N9?

Key risks include power derating (most alternatives have slightly lower power ratings), TCR mismatch (higher temperature drift), and tolerance degradation. Verify these against your application's power dissipation and precision requirements.

PTFR0805B49R9N9 Alternatives, Datasheet & Cross Reference | C&B RESI

Find and compare alternatives for the RESI PTFR0805B49R9N9, a 49.9Ω ±0.1% 130mW 0805 precision thin film resistor. Review key parametric differences before selection.

AI replacement insight

Electrical riskmedium

Most alternatives have slightly lower power ratings and/or higher TCR, requiring circuit analysis.

Package risklow

All candidates share the same 0805 package, ensuring physical compatibility.

Can it be replaced directly?

No direct drop-in replacement has been verified. All candidates have parametric trade-offs requiring engineering review.

Best replacement path

Parametric alternatives like ARG05BTC49R9 offer the closest match but require review for power and TCR differences.

Main risk

The primary risk is accepting a substitute with a lower power rating or a higher temperature coefficient (TCR), which could affect performance and reliability.

Recommended alternatives

A strong alternative with matching resistance and tolerance, but slightly weaker power and TCR.

View details

Alternative comparison matrix

Feature / factor	PTFR0805B49R9N9	ARG05BTC49R9	TD05G50R0BT	Compatibility / risk
Package	0805	0805	0805	0805 — Form-fit match.; TD05G50R0BT: Form-fit match.
Resistance	49.9Ω	49.9Ω	50.0Ω	49.9Ω / 50.0Ω — Exact nominal resistance.; TD05G50R0BT: 0.2% difference, within tolerance.
Tolerance	0.1%	0.1%	0.1%	0.1% — Precision matches.; TD05G50R0BT: Precision matches.
Power	0.13W	0.125W	0.1W	0.125W / 0.1W — Slightly lower power rating.; TD05G50R0BT: Lower power rating requires derating analysis.
Tcr	±10ppm/℃	±25ppm/℃	±25ppm/℃	±25ppm/℃ — Higher drift may affect precision.; TD05G50R0BT: Higher drift may affect precision.

Application & sourcing insights

Questions & answers

ARG05BTC49R9 from Viking Tech is a strong candidate, matching resistance and tolerance in an 0805 package, but has a slightly lower power rating (125mW) and higher TCR (±25ppm/℃). Engineering review is recommended.