Littelfuse 0257005.U Automotive Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0257005.U is a 5A 32VDC automotive blade fuse designed for ATO/ATC holder applications. This part carries an Obsolete product status, making identification of active equivalent components essential for ongoing system support and procurement planning. The fuse provides fast-blow protection with a 1kA breaking capacity and operates across the -40°C to 105°C temperature range typical of automotive environments.

Substiute Parts

0257005.U

Littelfuse Inc.In Stock: 7700257005.U Datasheet

Current PartRFQ

0287005.PXCN

Littelfuse Inc.In Stock: 2908810287005.PXCN Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse 0287005.PXCN qualifies as a direct substitute based on the following critical parameters:

• Current Rating: 5 A (identical)
• Voltage Rating - DC: 32 V (identical)
• Fuse Type: Automotive (identical)
• Package / Case: Blade, ATO/ATC (identical)
• Response Time: Fast Blow (identical)
• Breaking Capacity @ Rated Voltage: 1kA (identical)
• Melting I²t: 26 (identical)
• DC Cold Resistance: 0.01785 Ohms (identical)
• Operating Temperature Range: -40°C ~ 105°C (identical)

The substitute part maintains full electrical and mechanical compatibility with the original specification. The primary distinction is product status: the substitute carries Active status with significantly higher inventory availability (290,794 pcs vs. 743 pcs).

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 0287005.PXCN is the appropriate selection for applications currently specified with the 0257005.U. The substitute maintains identical electrical performance characteristics, mechanical compatibility with ATO/ATC holders, and thermal operating range. Both parts carry equivalent regulatory compliance (cULus vs. UL certification) and RoHS3 compliance status.

The transition from Obsolete to Active product status ensures long-term component availability and supply chain continuity. Dimensional tolerances between the two parts (±0.002" variation) remain within standard ATO/ATC holder specifications and do not affect functional performance or mechanical fit.

Frequently Asked Questions (FAQ)

Q: Can the 0287005.PXCN be used as a direct replacement in existing designs?

A: Yes. The substitute part maintains identical current rating, voltage rating, response time, breaking capacity, and resistance characteristics. Mechanical compatibility with ATO/ATC holders is preserved. Dimensional variations are within standard holder tolerances.

Q: What is the difference between the cULus and UL certifications listed for each part?

A: Both certifications indicate compliance with UL standards for automotive fuses. The cULus marking on the original part indicates dual certification (Canada and United States). The UL marking on the substitute indicates United States certification. Both are acceptable for automotive applications.

Q: Are there packaging differences between these parts?

A: The original part (0257005.U) is packaged in a 500-piece configuration. The substitute (0287005.PXCN) is available in bulk packaging. For procurement purposes, confirm packaging requirements with your supplier, as this affects order quantities and handling.

Q: Do the minor dimensional differences affect holder compatibility?

A: No. The dimensional variations (approximately 0.002" per axis) fall within standard ATO/ATC holder tolerances and do not affect insertion, retention, or electrical contact performance.

Q: Why is the original part marked as Obsolete?

A: Obsolete status indicates the manufacturer has discontinued active production and support. The substitute part (0287005.PXCN) from the same manufacturer provides equivalent functionality with ongoing availability and support.