5MF 80 Equivalent & Substitute Parts

Part Overview

The 5MF 80 is an 80 mA, 250 V AC/DC fast-blow glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm x 20mm package format. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and component procurement. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and performance characteristics to ensure direct compatibility in existing fuse holder assemblies.

Substiute Parts

5MF 80

Bel Fuse Inc.In Stock: 7065MF 80 Datasheet

Current PartRFQ

0217.080HXP

Littelfuse Inc.In Stock: 8360217.080HXP Datasheet

SimilarRFQ

GDB-80MA

Eaton - Electronics DivisionIn Stock: 1032GDB-80MA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5MF 80 is determined by strict equivalence across the following parameters:

• Current Rating: 80 mA (exact match required)
• Voltage Rating: 250 V AC minimum (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)
• Package Dimensions: 5mm x 20mm (exact match required)
• Mounting Configuration: Requires Holder (exact match required)

All identified substitute parts meet these criteria and are therefore electrically and mechanically interchangeable with the 5MF 80 in applications utilizing standard 5mm x 20mm fuse holders.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring replacement of the obsolete 5MF 80, both 0217.080HXP (Littelfuse Inc.) and GDB-80MA (Eaton - Electronics Division) provide active-status alternatives with identical electrical and mechanical specifications.

The 0217.080HXP offers ROHS3 compliance and broader approval agency certifications (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE), making it suitable for applications with regulatory compliance requirements. The GDB-80MA provides lower DC cold resistance (5 Ohms versus 10.2 Ohms in the original), which may be advantageous in low-resistance circuit applications.

Selection between these two substitutes should be based on specific application requirements regarding regulatory compliance, circuit resistance characteristics, and component availability.

Frequently Asked Questions (FAQ)

Q: Can the 0217.080HXP or GDB-80MA be used as direct replacements for the 5MF 80?

A: Yes. Both substitute parts are electrically and mechanically equivalent. They share identical current ratings (80 mA), voltage ratings (250 V AC), fuse type (cartridge, glass), response time (fast blow), and package dimensions (5mm x 20mm). Both require standard 5mm x 20mm fuse holders.

Q: What is the significance of the different Breaking Capacity values?

A: The 5MF 80 specifies 200A breaking capacity, while both substitutes specify 35A. Breaking capacity indicates the maximum fault current the fuse can safely interrupt. The lower breaking capacity of the substitutes does not affect compatibility in standard applications; however, applications with fault currents exceeding 35A should retain the original 5MF 80 or consult the circuit designer.

Q: Why do the substitute parts have different DC Cold Resistance values?

A: DC cold resistance variations (10.2 Ohms, 7.89 Ohms, and 5 Ohms) reflect manufacturing differences between manufacturers. These differences are within acceptable tolerances for standard fuse applications and do not affect functional interchangeability in typical circuit designs.

Q: Is RoHS compliance a requirement for substitution?

A: RoHS compliance is not a substitution requirement; it is a regulatory consideration. The 0217.080HXP is ROHS3 compliant, while the original 5MF 80 is non-compliant. Selection should align with the regulatory environment of the end application.

Q: Are there any packaging or inventory considerations?

A: The 0217.080HXP is available in bulk packaging with 820 units in stock. The GDB-80MA is available in bulk packaging with 963 units in stock. Both represent active products with established supply chains, unlike the obsolete 5MF 80.