Littelfuse 168.6785.5152 Automotive Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 168.6785.5152 is a 15A 32VDC miniature blade automotive fuse designed for automotive electrical protection circuits. This part is classified as obsolete, making identification of active equivalent components essential for ongoing system support and procurement planning. The substitute part maintains identical electrical performance characteristics while offering improved availability through active product status.

Substiute Parts

168.6785.5152

Littelfuse Inc.In Stock: 2156168.6785.5152 Datasheet

Current PartRFQ

0297015.WXNV

Littelfuse Inc.In Stock: 601390297015.WXNV Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The substitute part 0297015.WXNV is classified as a direct equivalent based on the following critical parameters:

• Current Rating: Both parts rated at 15 A
• Voltage Rating - DC: Both rated at 32 V
• Fuse Type: Both are automotive-grade fuses
• Package / Case: Both use Blade, Miniature form factor
• Response Time: Both employ Fast Blow characteristics
• Breaking Capacity: Both rated at 1kA @ rated voltage
• Mounting Type: Both require holder installation
• RoHS Compliance: Both meet ROHS3 requirements

The primary distinction is product status: the main part (168.6785.5152) is obsolete, while the substitute (0297015.WXNV) maintains active status with significantly higher inventory availability.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 0297015.WXNV is the direct substitute for the obsolete 168.6785.5152. Selection is based on:

• Electrical Equivalence: Identical current rating (15A), voltage rating (32VDC), response time (Fast Blow), and breaking capacity (1kA)
• Mechanical Compatibility: Both use Blade, Miniature package form factor compatible with standard automotive fuse holders
• Regulatory Compliance: Both meet ROHS3 requirements and carry cULus/equivalent approvals
• Product Availability: The substitute maintains active manufacturing status with substantially higher inventory levels, ensuring long-term procurement viability

The minor dimensional variations and melting I²t difference do not affect functional compatibility in automotive protection circuits designed for the 15A/32VDC specification.

Frequently Asked Questions (FAQ)

Q: Can the 0297015.WXNV directly replace the 168.6785.5152 in existing automotive circuits?

A: Yes. Both parts share identical electrical ratings (15A, 32VDC), response characteristics (Fast Blow), and mechanical form factor (Blade, Miniature). No circuit modifications are required.

Q: What is the significance of the different melting I²t values (178 vs. 270)?

A: The melting I²t parameter describes thermal energy absorption before element fusion. The substitute's higher value (270) indicates slightly greater thermal capacity while maintaining the same current rating and response time. This does not affect compatibility in circuits designed for 15A protection.

Q: Are there dimensional differences between these parts?

A: Minor dimensional variations exist within the miniature blade specification. The substitute is slightly shorter (0.429" vs. 0.469") and marginally taller (0.346" vs. 0.339"). Both fit standard automotive miniature fuse holders without modification.

Q: Why is the original part obsolete?

A: The 168.6785.5152 (FK1 MINI® series) has been superseded by the 0297015.WXNV (MINI® 297 series). Littelfuse has consolidated its miniature automotive fuse product line, with the newer series offering improved manufacturing consistency and availability.

Q: Are both parts RoHS compliant?

A: Yes. Both the 168.6785.5152 and 0297015.WXNV meet ROHS3 compliance requirements.

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

A: The DC cold resistance values are nearly identical (0.0045 Ohms vs. 0.00458 Ohms), representing a negligible 0.18% difference. This has no practical impact on circuit performance.