Is there a pin-compatible replacement for 045101.5MRL?

Pin-compatibility cannot be confirmed as the target part's pinout details are not specified. Candidates from the same Littelfuse 451 series likely share the same footprint but have different, unsafe current ratings.

What risks should I check before replacing 045101.5MRL?

Key risks include: 1) Current Rating: Must be 1.5A for proper protection. 2) Time-Current Curve: Must match the application's needs. 3) Physical Dimensions: Ensure the SMD footprint is identical. 4) Interrupting Rating: Must be sufficient for the circuit's fault conditions.

045101.5MRL Alternatives, Datasheet & Cross Reference | Littelfuse

Reviewing alternatives for the Littelfuse 045101.5MRL, a 1.5A 125V very fast-acting SMD fuse. Finding a direct replacement requires matching the current rating, voltage, response time, and physical package to ensure circuit safety.

AI replacement insight

Electrical riskhigh

Using a fuse with a higher current rating will not protect the circuit as designed.

Package risklow

Alternatives within the same manufacturer series are likely to be package-compatible, but verification is still needed.

Can it be replaced directly?

No direct drop-in replacement has been identified. Other fuses in the Littelfuse 451 series have different current ratings and are not suitable substitutes.

Best replacement path

Search for a Very Fast-Acting, 1.5A, 125V (or higher) fuse in a compatible SMD package from any reputable manufacturer and verify its datasheet.

Main risk

The primary risk is mismatching the current rating, which can lead to inadequate circuit protection and potential damage or safety hazards.

Recommended alternatives

A fuse from the same family but with a significantly higher current rating, requiring careful engineering review.

View details

Alternative comparison matrix

Feature / factor	045101.5MRL	0451004.MRL	0451007.MRL	045106.3MRL	Compatibility / risk
Current	1.5 A	4.0 A	7.0 A	6.3 A	4.0 A / 7.0 A / 6.3 A — Significantly higher current rating offers less protection.; 0451007.MRL: Significantly higher current rating offers less protection.; 045106.3MRL: Significantly higher current rating offers less protection.
Voltage	125 V	125 V	125 V	125 V	125 V — matched; 0451007.MRL: matched; 045106.3MRL: matched
Package	SMD	SMD	SMD	SMD	SMD — Same family, likely same footprint.; 0451007.MRL: Same family, likely same footprint.; 045106.3MRL: Same family, likely same footprint.
Pinout	Not specified	Not specified	Not specified	2	Not specified / 2 — Pin count missing for both target and candidate.; 0451007.MRL: Pin count missing for both target and candidate.; 045106.3MRL: Target pin count is unknown.
Response Time	Very Fast-Acting	-	-	Very Fast-Acting	Very Fast-Acting — matched

Application & sourcing insights

Questions & answers

Currently, no direct drop-in alternative is confirmed. The best path is to select another 1.5A, 125V, very fast-acting fuse in a compatible SMD package and verify its time-current curve and dimensions from the datasheet.