Littelfuse 0674.100MXEP Ceramic Axial Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0674.100MXEP is a 100 mA, 250 V AC/DC ceramic cartridge fuse with fast-blow response characteristics, designed for through-hole mounting in axial configuration. This part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing system support and procurement planning. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts satisfy the core functional requirements within allowable parameter tolerances for this fuse category.

Substiute Parts

0674.100MXEP

Littelfuse Inc.In Stock: 9870674.100MXEP Datasheet

Current PartRFQ

0874.100MXEP

Littelfuse Inc.In Stock: 12950874.100MXEP Datasheet

DirectRFQ

0674.100MXE

Littelfuse Inc.In Stock: 9800674.100MXE Datasheet

Parametric EquivalentRFQ

0676.100MXE

Littelfuse Inc.In Stock: 6940676.100MXE Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for ceramic axial fuses is determined by the following parameters:

• Current Rating: Must match exactly at 100 mA
• Voltage Rating (AC): Must match exactly at 250 V
• Fuse Type: Must be Cartridge, Ceramic
• Response Time: Must be Fast Blow
• Mounting Type: Must be Through Hole
• Package / Case: Must be Cartridge, Non-Standard (Axial)

The substitute parts identified below satisfy these core electrical and mechanical requirements. Variations in breaking capacity, melting I²t, physical dimensions within tolerance, DC cold resistance, and thermal operating range do not preclude functional substitution when the primary parameters align.

Parameter Comparison

Engineering Selection Recommendations

0874.100MXEP is the primary direct substitute. It maintains all core electrical parameters (100 mA, 250 V, fast-blow ceramic cartridge) and is currently in active production status with cULus certification. Physical dimensions are slightly reduced (0.142" Dia x 0.394" L versus 0.154" Dia x 0.433" L), which may require mechanical verification for PCB footprint compatibility. This part is ROHS3 compliant and carries an extended operating temperature range of -55°C to 125°C. Inventory availability is higher (1254 pcs) compared to the main part.

0674.100MXE is a parametric equivalent maintaining identical electrical specifications and physical dimensions to the main part. It is active in production with CSA and UL certification. However, it is RoHS non-compliant, which may restrict use in applications subject to RoHS regulations.

0676.100MXE is a parametric equivalent with identical electrical specifications and physical dimensions. It is active in production with CSA and UL certification but is RoHS non-compliant. Breaking capacity is reduced to 35 A (versus 50 A for the main part), which may be a limiting factor in high-fault-current environments.

For applications requiring RoHS3 compliance and extended thermal operating range, 0874.100MXEP is the recommended selection. For applications requiring identical breaking capacity and certification profile, 0674.100MXE or 0676.100MXE may be considered, subject to RoHS compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can 0874.100MXEP be used as a direct replacement for 0674.100MXEP?

A: Yes, 0874.100MXEP satisfies all core electrical and functional requirements. Physical dimensions are slightly smaller, requiring verification that the component fits the existing PCB footprint and mechanical mounting configuration.

Q: What is the significance of the breaking capacity difference between 0676.100MXE (35 A) and the main part (50 A)?

A: Breaking capacity defines the maximum fault current the fuse can safely interrupt at rated voltage. The 0676.100MXE is suitable for applications with fault currents up to 35 A. If the system design requires 50 A breaking capacity, 0676.100MXE is not appropriate.

Q: Are the parametric equivalents (0674.100MXE and 0676.100MXE) suitable for new designs?

A: Both parts are active in production and electrically equivalent. However, both are RoHS non-compliant. For new designs subject to RoHS regulations, 0874.100MXEP is the compliant option.

Q: What does the difference in melting I²t indicate?

A: Melting I²t is a thermal characteristic affecting fuse response time under specific fault conditions. The main part and 0674.100MXE share identical melting I²t (0.00192), while 0874.100MXEP and 0676.100MXE differ. These differences do not affect substitution eligibility for the specified 100 mA, 250 V fast-blow application.

Q: Does the operating temperature range of 0874.100MXEP (-55°C to 125°C) affect substitution suitability?

A: The extended temperature range of 0874.100MXEP provides broader environmental capability. If the original application operates within this range, 0874.100MXEP is fully suitable. If operating temperatures are not specified for the main part, the extended range of 0874.100MXEP represents an advantage.

Q: What certifications are relevant for my application?

A: The main part carries CSA and UL certification. 0874.100MXEP carries cULus certification (combined Canadian and US UL approval). The parametric equivalents carry CSA and UL certification. Verify that the selected part's certification aligns with your application's regulatory requirements.