Equivalent & Substitute Parts for 5MFP 300-R

Part Overview

The 5MFP 300-R is a 300 mA, 250 V AC/DC fast-blow glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm x 20mm axial through-hole package. This component is classified as obsolete, making identification of active equivalent parts essential 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 300-R

Bel Fuse Inc.In Stock: 11895MFP 300-R Datasheet

Current PartRFQ

0235.300HXEP

Littelfuse Inc.In Stock: 11730235.300HXEP Datasheet

DirectRFQ

0235.300MXEP

Littelfuse Inc.In Stock: 11900235.300MXEP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 5MFP 300-R is based on strict equivalence of the following electrical and mechanical parameters:

• Current Rating: 300 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 (minimum required)

The substitute parts identified—0235.300HXEP and 0235.300MXEP from Littelfuse Inc.—meet all critical electrical parameters. Both are active products with current manufacturing status, providing long-term availability compared to the obsolete 5MFP 300-R.

Parameter Comparison

Engineering Selection Recommendations

Both 0235.300HXEP and 0235.300MXEP are direct functional equivalents to the 5MFP 300-R. Selection between these two Littelfuse alternatives should be based on procurement availability and packaging requirements, as both are active products with identical electrical and mechanical specifications.

The transition from the obsolete 5MFP 300-R to either Littelfuse substitute ensures continued compliance with CE, CSA, and UL certifications. Both substitute parts maintain ROHS3 compliance and are suitable for applications requiring -55°C to 125°C operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can 0235.300HXEP and 0235.300MXEP be used interchangeably with 5MFP 300-R?

A: Yes. Both Littelfuse parts are direct substitutes. They share identical current ratings (300 mA), voltage ratings (250 V AC), fuse type (cartridge, glass), response time (fast blow), and package dimensions (5mm x 20mm axial). Through-hole mounting compatibility is maintained.

Q: What is the difference between 0235.300HXEP and 0235.300MXEP?

A: Both parts are functionally identical in electrical and mechanical specifications. The difference lies in the product designation suffix (HXEP vs. MXEP), which typically indicates manufacturing or packaging variants within the Littelfuse 235 series. Consult Littelfuse documentation for specific variant details.

Q: Why is the 5MFP 300-R listed as obsolete?

A: Obsolete status indicates the part is no longer in active production by Bel Fuse Inc. The Littelfuse 235 series substitutes provide equivalent functionality with active manufacturing support and assured long-term availability.

Q: Are there any dimensional differences between the main part and substitutes?

A: The 5MFP 300-R has a nominal dimension of 0.217" Dia x 0.827" L (5.50mm x 21.00mm). The Littelfuse substitutes are 0.236" Dia x 0.886" L (6.00mm x 22.50mm). Both fit the 5mm x 20mm (Axial) package classification and are compatible with standard through-hole fuse holders designed for this package type.

Q: Do the substitute parts maintain the same certifications?

A: The 5MFP 300-R carries CE, CSA, and cULus approvals. The Littelfuse substitutes carry CE, CSA, KC, and UL approvals. Both meet the regulatory requirements for 250 V AC/DC circuit protection applications.