5MFP 3 Equivalent & Substitute Parts

Part Overview

The 5MFP 3 is a 3A 250VAC 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 suitable alternatives essential for ongoing system maintenance and component procurement. The 5MFP 3-R represents the active production equivalent, offering identical electrical and mechanical specifications with improved compliance status.

Substiute Parts

5MFP 3

Bel Fuse Inc.In Stock: 9535MFP 3 Datasheet

Current PartRFQ

5MFP 3-R

Bel Fuse Inc.In Stock: 25925MFP 3-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 5MFP 3-R qualifies as a direct substitute for the 5MFP 3 based on the following critical parameters:

• Current Rating: Identical at 3 A
• Voltage Rating (AC): Identical at 250 V
• Fuse Type: Both are fast-blow glass cartridge fuses
• Package / Case: Both use 5mm x 20mm axial form factor
• Breaking Capacity: Both rated at 200A @ rated voltage
• Melting I²t: Both rated at 13
• Mounting Type: Both are through-hole components
• Operating Temperature Range: Identical -55°C ~ 125°C

The substitution is based on functional equivalence across all electrical and mechanical parameters. The primary distinction lies in product status and compliance certifications rather than performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The 5MFP 3-R is the direct active production equivalent of the 5MFP 3. Selection of the 5MFP 3-R is appropriate for all applications currently using the 5MFP 3, as it maintains identical electrical performance and mechanical compatibility while offering improved regulatory compliance status.

The 5MFP 3-R carries ROHS3 compliance, whereas the original 5MFP 3 is non-compliant. For new designs or systems requiring RoHS compliance, the 5MFP 3-R is the mandated choice. For legacy system maintenance where RoHS compliance is not a requirement, both parts remain functionally equivalent.

The DC cold resistance differential (0.03 Ohms vs. 0.029 Ohms) is negligible and does not affect circuit performance in standard fuse applications.

Frequently Asked Questions (FAQ)

Q: Can the 5MFP 3-R be used as a direct replacement for the 5MFP 3?

A: Yes. The 5MFP 3-R is electrically and mechanically identical to the 5MFP 3. Both parts share the same current rating (3A), voltage rating (250VAC), fuse type (fast-blow glass cartridge), and physical dimensions (5mm x 20mm axial). Direct substitution is valid for all applications.

Q: What is the difference between the 5MFP 3 and 5MFP 3-R?

A: The primary differences are product status and compliance certifications. The 5MFP 3 is obsolete and RoHS non-compliant, while the 5MFP 3-R is an active product with ROHS3 compliance. Electrical and mechanical performance are identical.

Q: Are there any compatibility concerns when switching from 5MFP 3 to 5MFP 3-R?

A: No compatibility concerns exist. Both parts use identical through-hole mounting, the same 5mm x 20mm axial package, and operate across the same temperature range (-55°C ~ 125°C). PCB footprints and circuit designs require no modification.

Q: Does the DC cold resistance difference affect circuit operation?

A: No. The difference between 0.03 Ohms and 0.029 Ohms is negligible in fuse applications and does not impact circuit performance or protection characteristics.

Q: Which part should be selected for new designs?

A: The 5MFP 3-R should be selected for all new designs. It is the active production part with current regulatory compliance and full manufacturer support.