Is there a pin-compatible replacement for RXEF050?

Yes, Littelfuse's RXEF050-2 is a pin-compatible replacement. It is the same electrical component, just supplied on tape and reel for automated assembly.

What risks should I check before replacing RXEF050?

Before replacing, verify the time-current trip curve, initial resistance, and temperature derating. A mismatch in these secondary parameters could affect circuit protection timing and performance.

RXEF050 Alternatives, Datasheet & Cross Reference | Littelfuse

Finding a replacement for the Littelfuse RXEF050 involves matching its 72V, 0.5A hold current, and radial leaded package. Both identical-spec and cross-vendor options are available.

AI replacement insight

Electrical riskmedium

Cross-vendor parts may have different resistance values or trip characteristics despite matching hold/trip currents.

Package risklow

Most candidates use a standard radial leaded package, but lead spacing and body dimensions should be double-checked.

Sourcing risklow

The target is from a major brand (Littelfuse); alternatives may have different supply chain stability.

Can it be replaced directly?

Yes, the Littelfuse RXEF050-2 is a direct, pin-compatible replacement for the RXEF050, differing only in its packaging format (tape and reel).

Best replacement path

The Littelfuse RXEF050-2 is the same component in tape-and-reel packaging, making it the ideal replacement. For a cross-vendor option, the JDT Fuse A72-050 matches key parameters but requires datasheet verification.

Main risk

The main risk when substituting PTC fuses is a mismatch in the time-current trip curve, which can lead to premature tripping or failure to protect the circuit under fault conditions.

Recommended alternatives

This is the same part from Littelfuse, with the '-2' suffix indicating tape and reel packaging.

View details

Alternative comparison matrix

Feature / factor	RXEF050	RXEF050-2	A72-050	Compatibility / risk
Package	Radial Leaded	Radial Leaded	Radial Leaded	Radial Leaded — Form factor matches.; A72-050: Form factor matches.
Voltage	72.0V	72.0V	72.0V	72.0V — Maximum voltage rating matches.; A72-050: Maximum voltage rating matches.
Current	1.0A	1.0A	1.0A	1.0A — Trip current matches.; A72-050: Trip current matches.
Manufacturer	Littelfuse	Littelfuse	-	Littelfuse — Same manufacturer, suffix denotes packaging.
Power	0.77W	-	0.8W	0.8W — Power dissipation is comparable.

Application & sourcing insights

Questions & answers

The best alternative is RXEF050-2, which is the same part from Littelfuse in a different package. A strong functional alternative is A72-050 from JDT Fuse, which requires datasheet verification.