Littelfuse 067501.5MXEP Ceramic Axial Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 067501.5MXEP is a 1.5 A, 250 V AC/DC ceramic cartridge fuse with axial through-hole mounting. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system maintenance and design updates. The fuse provides slow-blow response characteristics suitable for applications requiring transient current tolerance before circuit protection activation.

Key Parameters

Parameter	Specification
Current Rating	1.5 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Ceramic
Response Time	Slow Blow
Mounting Type	Through Hole
Package / Case	Cartridge, Non-Standard (Axial)
Breaking Capacity @ Rated Voltage	50 A
Size / Dimension	0.154" Dia x 0.433" L (3.90mm x 11.00mm)
DC Cold Resistance	0.051 Ohms
Approval Agency	CSA, UL
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 067501.5MXEP is determined by strict equivalence across the following critical parameters:

Current Rating: 1.5 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Fuse Type: Cartridge, Ceramic (exact match required)
Response Time: Slow Blow (exact match required)
Mounting Type: Through Hole (exact match required)
Breaking Capacity @ Rated Voltage: 50 A (exact match required)

Two substitute parts meet these criteria:

Direct Manufacturer Substitute: 087501.5MXEP (Littelfuse Inc., Series 875, Active status)

Parametric Equivalent: 067501.5MXE (Littelfuse Inc., Series 675, Active status)

Both substitutes maintain identical electrical performance specifications and mechanical compatibility with the original part.

Parameter Comparison

Parameter	067501.5MXEP (Main Part)	087501.5MXEP (Direct Substitute)	067501.5MXE (Parametric Equivalent)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	1.5 A	1.5 A	1.5 A
Voltage Rating - AC	250 V	250 V	250 V
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	Slow Blow	Slow Blow	Slow Blow
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Cartridge, Non-Standard (Axial)	Cartridge, Non-Standard (Axial)	Cartridge, Non-Standard (Axial)
Breaking Capacity @ Rated Voltage	50 A	50 A	50 A
Melting I²t	4.61	4.33	4.61
DC Cold Resistance (Ohms)	0.051	0.0519	0.051
Size / Dimension	0.154" Dia x 0.433" L (3.90mm x 11.00mm)	0.142" Dia x 0.394" L (3.60mm x 10.00mm)	0.154" Dia x 0.433" L (3.90mm x 11.00mm)
Approval Agency	CSA, UL	cULus	CSA, UL
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

087501.5MXEP (Direct Manufacturer Substitute - Recommended for New Designs)

This part is the primary substitute for the obsolete 067501.5MXEP. It maintains all critical electrical parameters and is classified as Active status, ensuring long-term availability. The part carries cULus certification, providing broader regulatory acceptance. Physical dimensions differ slightly (0.142" Dia x 0.394" L versus 0.154" Dia x 0.433" L), requiring mechanical fit verification in existing assemblies. The melting I²t value of 4.33 represents a minor deviation from the original 4.61, which may affect thermal response characteristics in specific circuit applications. ROHS3 compliance is maintained.

067501.5MXE (Parametric Equivalent - For Direct Mechanical Replacement)

This part provides identical electrical and mechanical specifications to the main part, including matching dimensions and melting I²t value. It is classified as Active status and carries CSA and UL certifications identical to the original. However, this part is RoHS non-compliant, which may restrict use in applications subject to RoHS regulatory requirements. This option is suitable for legacy system maintenance where RoHS compliance is not mandated.

Frequently Asked Questions (FAQ)

Q: Can 087501.5MXEP be used as a direct replacement for 067501.5MXEP in existing circuit boards?

A: Electrical substitution is valid. However, physical dimensions differ: 087501.5MXEP measures 0.142" Dia x 0.394" L compared to 067501.5MXEP at 0.154" Dia x 0.433" L. Mechanical fit verification in the fuse holder or socket is required before installation.

Q: What is the significance of the melting I²t difference between 067501.5MXEP (4.61) and 087501.5MXEP (4.33)?

A: Melting I²t indicates the thermal energy required to melt the fuse element. The higher value in 087501.5MXEP (4.33) means slightly longer thermal response time under fault conditions. Both parts maintain the same 1.5 A current rating and 50 A breaking capacity, but circuit designers should evaluate whether this thermal characteristic change affects system protection timing.

Q: Why is 067501.5MXE marked as RoHS non-compliant?

A: RoHS compliance status reflects the manufacturing process and material composition at the time of production. The 067501.5MXE was manufactured under non-compliant specifications. For applications requiring RoHS certification, 087501.5MXEP is the appropriate choice.

Q: Are all three parts electrically interchangeable?

A: Yes, all three parts share identical current rating (1.5 A), voltage rating (250 V AC), fuse type (Ceramic Cartridge), response time (Slow Blow), and breaking capacity (50 A). Electrical interchangeability is confirmed. Mechanical fit and regulatory compliance requirements determine practical substitution suitability.

Q: What certifications apply to each substitute part?

A: 067501.5MXEP carries CSA and UL certifications. 087501.5MXEP carries cULus certification. 067501.5MXE carries CSA and UL certifications. Verify that the certification requirements of your application align with the selected substitute part.

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