Is there a pin-compatible replacement for FRC0402F4121TS?

Yes, parts like FRC0402F4221TS and RC0402FR-074K22L are in the same 0402 package and are pin-compatible. However, their resistance values are not identical, so they are not drop-in replacements without electrical validation.

What risks should I check before replacing FRC0402F4121TS?

Before replacing, primarily check if your circuit can tolerate a resistance change of +2.4% or more. Also, confirm that the 1/16W power and 50V voltage ratings provide sufficient design margin for your application.

FRC0402F4121TS Alternatives, Datasheet & Cross Reference | FOJAN

FRC0402F4121TS is a general-purpose 4.12kΩ 1% 1/16W thick film resistor in a 0402 package. While no exact drop-in replacements were found, several pin-compatible alternatives with very similar resistance values are available.

AI replacement insight

Electrical riskmedium

Resistance value differs. Application must tolerate a +2.4% to +4.4% shift.

Package risklow

All suggested alternatives use the same standard 0402 package.

Can it be replaced directly?

No direct, drop-in replacement with the exact 4.12kΩ value was identified. The closest options have slightly different resistance values, requiring engineering review.

Best replacement path

Use FRC0402F4221TS from the same series if a +2.4% resistance change is acceptable in your circuit.

Main risk

The primary risk is the slight mismatch in resistance value, which could affect the performance of precision analog circuits or voltage dividers.

Recommended alternatives

Same series and manufacturer, with a very close resistance value of 4.22kΩ.

View details

Alternative comparison matrix

Feature / factor	FRC0402F4121TS	FRC0402F4221TS	RT0402BRD074K3L	Compatibility / risk
Resistance	4.12 kΩ	4.22 kΩ	4.3 kΩ	4.22 kΩ / 4.3 kΩ — +2.4% deviation from target.; RT0402BRD074K3L: +4.4% deviation from target.
Technology	Thick Film	Thick Film	Thin Film	Thick Film / Thin Film — Matches target technology.; RT0402BRD074K3L: Different technology may affect pulse/noise performance.
Tolerance	±1%	±1%	±0.1%, 25 ppm/°C	±1% / ±0.1%, 25 ppm/°C — Matches target tolerance.; RT0402BRD074K3L: Higher precision than target.
Power	1/16W, 50V	1/16W, 50V	-	1/16W, 50V — Matches target, but no safety margin per rules.
Package	0402	0402	0402	0402 — Matches package, pin compatible.; RT0402BRD074K3L: Matches package, pin compatible.

Application & sourcing insights

Questions & answers

The best alternative is likely FRC0402F4221TS from the same manufacturer, FOJAN. It shares all key characteristics except for a slightly higher resistance of 4.22kΩ, which is a +2.4% difference.