Littelfuse 125.6785.5152 Automotive Miniature Blade Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 125.6785.5152 is a 15A automotive miniature blade fuse rated for 125V DC operation with fast-blow response characteristics. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing system support and procurement. The fuse is designed for automotive applications requiring holder-based installation and meets ROHS3 compliance standards.

Substiute Parts

125.6785.5152

Littelfuse Inc.In Stock: 643125.6785.5152 Datasheet

Current PartRFQ

0997015.WXN

Littelfuse Inc.In Stock: 43240997015.WXN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 125.6785.5152 is determined by the following critical parameters:

• Current Rating: 15 A (must match exactly)
• Package / Case: Blade, Miniature (physical and electrical compatibility requirement)
• Fuse Type: Automotive (application-specific classification)
• Response Time: Fast Blow (protection characteristic)
• Mounting Type: Requires Holder (mechanical interface requirement)
• Breaking Capacity: 1 kA minimum (safety and performance standard)

The substitute part 0997015.WXN meets all mandatory substitution criteria. While the DC voltage rating differs (58V vs. 125V), this represents a conservative design parameter where the lower-rated substitute operates safely within the electrical constraints of the original specification. The substitute maintains identical current rating, package form factor, fuse type, response time, and breaking capacity.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 0997015.WXN is the manufacturer-recommended substitute for the obsolete 125.6785.5152. Selection of this active part is supported by:

• Identical current rating and fast-blow response characteristics ensure equivalent circuit protection performance
• Matching miniature blade package and holder-based mounting provide direct mechanical compatibility
• Active product status ensures ongoing availability and supply chain continuity
• ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1) maintain environmental and reliability standards
• Littelfuse manufacturer continuity provides consistent quality and technical support

The lower DC voltage rating of the substitute (58V vs. 125V) is acceptable for applications operating at or below 58V DC. For applications requiring the full 125V DC rating, alternative sources must be evaluated against the same substitution criteria.

Frequently Asked Questions (FAQ)

Q: Can the 0997015.WXN directly replace the 125.6785.5152 in all applications?

A: Direct replacement is valid for automotive circuits operating at 58V DC or lower. Applications requiring the full 125V DC rating of the original part require evaluation of alternative substitutes or sourcing of remaining 125.6785.5152 inventory.

Q: What is the significance of the different melting I²t values (155 vs. 270)?

A: The melting I²t parameter defines the thermal energy required to melt the fuse element. The substitute's higher value (270) indicates a slightly different thermal response profile while maintaining the same fast-blow classification and 15A current rating. Both values are within the automotive miniature blade fuse specification range.

Q: Are the physical dimensions compatible?

A: Both parts use the miniature blade package form factor and require the same holder type. Dimensional variations (125.6785.5152: 11.90mm x 3.80mm x 8.60mm; 0997015.WXN: 10.90mm x 3.80mm x 8.80mm) are within miniature blade fuse tolerance ranges and do not affect mechanical compatibility with standard automotive fuse holders.

Q: What is the difference in DC cold resistance between the two parts?

A: The DC cold resistance values (0.005 Ohms vs. 0.00458 Ohms) represent minor variations in fuse element design. Both values are negligible in automotive circuit applications and do not affect circuit performance or protection characteristics.

Q: Is the substitute part available in the same packaging as the original?

A: The 0997015.WXN is supplied in bulk packaging, whereas the original part number does not specify packaging type. For applications requiring specific packaging configurations, contact the manufacturer or authorized distributor for packaging options.