Littelfuse 089107.5NXT Automotive Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 089107.5NXT is a 7.5 A automotive blade fuse rated for 58 V DC operation with fast-blow response characteristics. This component is classified as obsolete, which necessitates identification of active equivalent alternatives for ongoing design support and procurement. The fuse is designed for miniature blade holder applications in automotive electrical systems requiring overcurrent protection at specified voltage and current ratings.

Key Parameters

Parameter	Specification
Current Rating	7.5 A
Voltage Rating (DC)	58 V
Response Time	Fast Blow
Package Type	Blade, Miniature (Low Profile)
Mounting Type	Requires Holder
Physical Dimensions	0.429" L x 0.150" W x 0.331" H (10.90mm x 3.80mm x 8.40mm)
Operating Temperature Range	-40°C to 125°C
DC Cold Resistance	0.0107 Ohms
Melting I²t	53
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 089107.5NXT is determined by strict equivalence across the following critical parameters:

Current Rating: 7.5 A (exact match required)
Voltage Rating: 58 V DC (exact match required)
Response Time: Fast Blow (exact match required)
Package Type: Blade, Miniature (Low Profile) (exact match required)
Physical Dimensions: 0.429" L x 0.150" W x 0.331" H (exact match required)
Operating Temperature Range: -40°C to 125°C (exact match required)
Melting I²t: 53 (exact match required)

All identified substitute parts maintain identical electrical and mechanical characteristics across these parameters. Variations in Breaking Capacity at Rated Voltage and packaging format (bulk vs. tape) do not affect functional substitutability in the application circuit.

Parameter Comparison

Parameter	089107.5NXT (Main)	089107.5NXS	089107.5H	089107.5U
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	7.5 A	7.5 A	7.5 A	7.5 A
Voltage Rating - DC	58 V	58 V	58 V	58 V
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Package / Case	Blade, Miniature (Low Profile)	Blade, Miniature (Low Profile)	Blade, Miniature (Low Profile)	Blade, Miniature (Low Profile)
Size / Dimension	0.429" L x 0.150" W x 0.331" H (10.90mm x 3.80mm x 8.40mm)	0.429" L x 0.150" W x 0.331" H (10.90mm x 3.80mm x 8.40mm)	0.429" L x 0.150" W x 0.331" H (10.90mm x 3.80mm x 8.40mm)	0.429" L x 0.150" W x 0.331" H (10.90mm x 3.80mm x 8.40mm)
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
DC Cold Resistance	0.0107 Ohms	0.0107 Ohms	0.0107 Ohms	0.0107 Ohms
Melting I²t	53	53	53	53
Breaking Capacity @ Rated Voltage	1kA	1kA	10kA	1kA
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active
Series	LP MINI® 891	LP MINI® 891	LP MINI® 891	LP MINI® 891

Engineering Selection Recommendations

The 089107.5NXT is obsolete and should be replaced with an active equivalent for new designs and ongoing procurement. All three substitute parts (089107.5NXS, 089107.5H, 089107.5U) are active products from Littelfuse Inc. and maintain full electrical and mechanical compatibility.

089107.5NXS is the direct successor with identical specifications and is available in bulk packaging. This part is recommended as the primary replacement for the obsolete 089107.5NXT.

089107.5H provides enhanced breaking capacity (10kA vs. 1kA) while maintaining all other electrical parameters. This variant is suitable for applications requiring higher fault current interruption capability.

089107.5U maintains the original 1kA breaking capacity specification and is functionally equivalent to the main part across all critical parameters.

All substitute parts are ROHS3 compliant and carry identical environmental and regulatory certifications. Selection between active alternatives should be based on application-specific breaking capacity requirements and packaging availability.

Frequently Asked Questions (FAQ)

Q: Can 089107.5NXS directly replace 089107.5NXT in existing designs?

A: Yes. The 089107.5NXS maintains identical electrical ratings (7.5 A, 58 V DC), response time (fast blow), physical dimensions, and thermal characteristics. The primary difference is product status (active vs. obsolete) and packaging format (bulk). No circuit modifications are required.

Q: What is the significance of the different Breaking Capacity ratings between 089107.5H and the other parts?

A: Breaking capacity defines the maximum fault current the fuse can safely interrupt at rated voltage. The 089107.5H (10kA) provides higher fault current handling compared to 089107.5NXS and 089107.5U (1kA). Selection depends on the maximum prospective short-circuit current in the application circuit. Both ratings are valid for the specified 7.5 A continuous current operation.

Q: Are there packaging differences between the substitute parts?

A: Yes. 089107.5NXT and 089107.5NXS are available in bulk packaging. 089107.5H and 089107.5U are also supplied in bulk format. Packaging format does not affect electrical or mechanical compatibility; selection should be based on procurement and assembly requirements.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. All parts are ROHS3 compliant and carry identical regulatory certifications (ECCN: EAR99, HTSUS: 8536.10.0040). The 089107.5NXS and 089107.5H are additionally marked as REACH Unaffected.

Q: Can 089107.5H be used in applications originally designed for 089107.5NXT?

A: Yes. The 089107.5H is a parametric equivalent with enhanced breaking capacity. It maintains identical current rating, voltage rating, response time, dimensions, and thermal operating range. The higher breaking capacity (10kA) provides additional safety margin in fault conditions without affecting normal operation.

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