5MFP 800-R Equivalent & Substitute Parts

Part Overview

The 5MFP 800-R is an 800 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 designed for through-hole mounting applications requiring fast response time protection. The part maintains Active product status with 1784 pieces in current inventory. Substitute parts are identified to provide alternative sourcing options when the primary part becomes unavailable or when design flexibility is required within the specified electrical and mechanical parameters.

Substiute Parts

5MFP 800-R

Bel Fuse Inc.In Stock: 18035MFP 800-R Datasheet

Current PartRFQ

5SFP 800-R

Bel Fuse Inc.In Stock: 18765SFP 800-R Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5MFP 800-R is determined by strict equivalence across the following critical parameters:

• Current Rating: 800 mA (exact match required)
• Voltage Rating (AC): 250 V (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)

The 5SFP 800-R meets all mandatory substitution criteria. While secondary parameters such as Breaking Capacity, Melting I²t, DC Cold Resistance, and certification scope differ between the main part and substitute, these variations do not affect functional equivalence within the specified electrical and mechanical constraints.

Parameter Comparison

Engineering Selection Recommendations

Both the 5MFP 800-R and 5SFP 800-R are Active products manufactured by Bel Fuse Inc. with equivalent electrical and mechanical specifications. The 5MFP 800-R carries CE, CSA, and cULus certifications. The 5SFP 800-R carries an expanded certification scope including CCC, CE, CSA, cULus, IMQ, SEMKO, and VDE approvals, providing broader regulatory coverage for international applications.

Selection between these parts should be based on certification requirements specific to the target application and regional compliance mandates. Both parts are suitable for 800 mA, 250 V AC/DC fast-blow protection in 5mm x 20mm through-hole mounting configurations.

Frequently Asked Questions (FAQ)

Q: Can the 5SFP 800-R be used as a direct replacement for the 5MFP 800-R?

A: Yes. Both parts share identical current rating (800 mA), voltage rating (250 V AC), fuse type (Cartridge, Glass), response time (Fast Blow), package dimensions (5mm x 20mm Axial), mounting type (Through Hole), and operating temperature range (-55°C ~ 125°C). Physical and electrical compatibility is confirmed.

Q: What are the differences between these two parts?

A: The primary differences are Breaking Capacity (5MFP: 200A vs. 5SFP: 35A), Melting I²t (5MFP: 0.398 vs. 5SFP: 1.01), DC Cold Resistance (5MFP: 0.253 Ohms vs. 5SFP: 0.11 Ohms), and certification scope. The 5SFP 800-R includes additional international certifications (CCC, IMQ, SEMKO, VDE).

Q: Are there any mechanical compatibility concerns?

A: No. Both parts have identical physical dimensions (0.217" Dia x 0.827" L / 5.50mm x 21.00mm) and mounting type (Through Hole). They are mechanically interchangeable in standard fuse holders designed for 5mm x 20mm axial cartridge fuses.

Q: Which part should I select for international markets?

A: The 5SFP 800-R provides broader regulatory coverage with certifications including CCC, CE, CSA, cULus, IMQ, SEMKO, and VDE. Verify specific regional requirements for your target market.

Q: Are both parts RoHS compliant?

A: Yes. Both the 5MFP 800-R and 5SFP 800-R are ROHS3 Compliant and REACH Unaffected.