Equivalent & Substitute Parts for 5MFP 125

Part Overview

The 5MFP 125 is a 125 mA, 250 V AC/DC fast-blow glass cartridge fuse with a 5mm x 20mm axial form factor, manufactured by Bel Fuse Inc. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system maintenance and new design implementations. Substitute parts must maintain identical electrical ratings and mechanical compatibility to ensure proper circuit protection without modification to existing designs.

Substiute Parts

5MFP 125

Bel Fuse Inc.In Stock: 8475MFP 125 Datasheet

Current PartRFQ

0217.125MXEP

Littelfuse Inc.In Stock: 10610217.125MXEP Datasheet

SimilarRFQ

0235.125MXEP

Littelfuse Inc.In Stock: 8510235.125MXEP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5MFP 125 is determined by strict equivalence across the following parameters:

• Current Rating: 125 mA (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 5mm x 20mm (Axial) (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

Both identified substitute parts, 0217.125MXEP and 0235.125MXEP from Littelfuse Inc., meet all mandatory substitution criteria. These parts are manufactured by an established fuse supplier and carry active product status with current inventory availability.

Parameter Comparison

Engineering Selection Recommendations

Both 0217.125MXEP and 0235.125MXEP are functionally equivalent substitutes for the obsolete 5MFP 125. Selection between these two Littelfuse alternatives should be based on the following factors:

0217.125MXEP carries broader regulatory approvals including CCC, K-MARK, SEMKO, and VDE certifications in addition to CE, CSA, and UL. This part is suitable for applications requiring expanded international compliance coverage.

0235.125MXEP provides ROHS3 compliance with CE, CSA, KC, and UL certifications. This part is appropriate for applications with specific regional compliance requirements, particularly those requiring KC (Korea) certification.

Both substitute parts are ROHS3 compliant, addressing the non-compliance status of the original 5MFP 125. Both maintain active product status with current inventory availability. Dimensional variations exist between the original part and substitutes; physical space constraints in existing designs must be evaluated prior to implementation.

Frequently Asked Questions (FAQ)

Q: Can 0217.125MXEP and 0235.125MXEP be used interchangeably with the 5MFP 125?

A: Yes. Both parts meet all mandatory electrical and mechanical substitution criteria: 125 mA current rating, 250 V AC voltage rating, fast-blow response, cartridge glass fuse type, 5mm x 20mm axial package, and through-hole mounting. Operating temperature range is identical across all three parts.

Q: What are the dimensional differences between the original and substitute parts?

A: The 5MFP 125 measures 0.217" diameter x 0.827" length (5.50mm x 21.00mm). Both Littelfuse substitutes measure 0.236" diameter x 0.886" length (6.00mm x 22.50mm). Verify that existing fuse holders and mounting hardware accommodate the slightly larger substitute dimensions.

Q: How do the electrical characteristics differ between these parts?

A: DC cold resistance varies: 5MFP 125 at 6.8 Ohms, 0217.125MXEP at 3.82 Ohms, and 0235.125MXEP at 5.75 Ohms. Breaking capacity differs: 5MFP 125 at 200A versus 35A for both Littelfuse parts. Melting I²t values also differ. These variations do not affect substitution eligibility for standard circuit protection applications operating within rated parameters.

Q: What is the compliance advantage of the substitute parts?

A: Both 0217.125MXEP and 0235.125MXEP are ROHS3 compliant, addressing the non-compliant status of the obsolete 5MFP 125. The 0217.125MXEP offers expanded international certifications (CCC, K-MARK, SEMKO, VDE), while 0235.125MXEP includes KC certification for Korean market applications.

Q: Are there inventory considerations for these substitutes?

A: The 5MFP 125 has 793 pieces in stock. Substitute availability: 0217.125MXEP has 980 pieces and 0235.125MXEP has 742 pieces in current inventory. Both substitutes maintain active product status with ongoing supply.