Littelfuse 169.5252 Automotive Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 169.5252 is a 25A 32VDC automotive blade fuse with slow-blow response characteristics, designed for automotive electrical protection applications. This part operates in the OFK3 series and requires a compatible fuse holder for installation. The 169.5252 is classified as obsolete, making identification of active equivalent parts essential for ongoing system maintenance and new design implementations.

Substiute Parts

169.5252

Littelfuse Inc.In Stock: 855169.5252 Datasheet

Current PartRFQ

0299025.ZXNV

Littelfuse Inc.In Stock: 97490299025.ZXNV Datasheet

DirectRFQ

0299025.ZXT

Littelfuse Inc.In Stock: 10910299025.ZXT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete 169.5252 is based on matching the following critical electrical and mechanical parameters:

• Current Rating: 25 A (exact match required)
• Voltage Rating (DC): 32 V (exact match required)
• Package / Case: Blade, Max (exact match required)
• Response Time: Slow Blow (exact match required)
• Breaking Capacity @ Rated Voltage: 1 kA (exact match required)
• Mounting Type: Requires Holder (exact match required)

The substitute parts 0299025.ZXNV and 0299025.ZXT both satisfy these criteria and are manufactured by Littelfuse Inc. in the active MAXI® series, providing direct functional equivalence for the obsolete 169.5252.

Parameter Comparison

Engineering Selection Recommendations

Both 0299025.ZXNV and 0299025.ZXT are active production parts manufactured by Littelfuse Inc. and provide direct electrical and mechanical equivalence to the obsolete 169.5252. Selection between these two substitutes should be based on:

• Packaging requirements: 0299025.ZXNV and 0299025.ZXT are supplied in bulk packaging
• Approval certifications: 0299025.ZXT carries UR approval agency certification, while 0299025.ZXNV does not specify approval agency
• Dimensional tolerance: Both parts exhibit minor dimensional variations within the Blade, Max package specification
• Availability: 0299025.ZXNV offers higher inventory levels (9700 pcs) compared to 0299025.ZXT (1061 pcs)

All substitute parts maintain ROHS3 compliance and are suitable for direct replacement in applications previously using the 169.5252.

Frequently Asked Questions (FAQ)

Q: Can 0299025.ZXNV and 0299025.ZXT be used interchangeably with 169.5252?

A: Yes. Both parts match the critical electrical parameters (25A, 32VDC, slow-blow response, 1kA breaking capacity) and mechanical specifications (Blade, Max package, requires holder mounting). The minor dimensional variations fall within the Blade, Max package tolerance envelope.

Q: What is the difference between 0299025.ZXNV and 0299025.ZXT?

A: Both parts are electrically identical with matching current ratings, voltage ratings, and response characteristics. The primary differences are: 0299025.ZXT includes UR approval agency certification while 0299025.ZXNV does not specify approval agency; dimensional tolerances vary slightly within specification; and DC cold resistance values differ (0.00239 Ohms vs 2.39 Ohms). Inventory availability also differs, with 0299025.ZXNV having higher stock levels.

Q: Are these substitutes compatible with existing fuse holders designed for 169.5252?

A: Yes. All parts use the Blade, Max package and require compatible fuse holders. The dimensional variations between parts are within the tolerance range of standard Blade, Max fuse holder specifications.

Q: Do the substitute parts maintain the same compliance certifications?

A: All parts are ROHS3 compliant. 0299025.ZXT carries UR approval certification. Operating temperature specifications are provided for both active substitutes (-40°C ~ 125°C), whereas the obsolete 169.5252 does not specify operating temperature limits.

Q: Why is 169.5252 listed as obsolete?

A: The 169.5252 has been superseded by the active MAXI® series parts 0299025.ZXNV and 0299025.ZXT, which provide equivalent functionality with improved documentation and active manufacturing support.