Equivalent & Substitute Parts for 5MFP 250-R

Part Overview

The 5MFP 250-R is a 250 mA, 250 V AC/DC fast-blow glass cartridge fuse in a 5mm x 20mm axial package, manufactured by Bel Fuse Inc. This part is classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement. The fuse is designed for through-hole mounting applications requiring fast-response overcurrent protection in industrial and consumer electronics.

Substiute Parts

5MFP 250-R

Bel Fuse Inc.In Stock: 9265MFP 250-R Datasheet

Current PartRFQ

0235.250HXEP

Littelfuse Inc.In Stock: 8290235.250HXEP Datasheet

DirectRFQ

0235.250MXEP

Littelfuse Inc.In Stock: 30060235.250MXEP Datasheet

DirectRFQ

0217.250MXEP

Littelfuse Inc.In Stock: 27340217.250MXEP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 5MFP 250-R is determined by strict equivalence across the following electrical and mechanical parameters:

• Current Rating: 250 mA (exact match required)
• Voltage Rating: 250 V AC (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)
• RoHS Compliance: ROHS3 Compliant (exact match required)

All substitute parts listed below meet these criteria. Variations in breaking capacity, melting I²t, DC cold resistance, and physical dimensions within tolerance are permitted under IEC 60127 standards for fuse cartridges of this class.

Parameter Comparison

Engineering Selection Recommendations

All three Littelfuse substitutes (0235.250HXEP, 0235.250MXEP, and 0217.250MXEP) are functionally equivalent to the obsolete 5MFP 250-R based on electrical and mechanical parameters. Selection should be based on the following criteria:

0235.250MXEP is the primary recommendation due to highest inventory availability (2968 pcs) and active product status with comprehensive certification coverage (CE, CSA, KC, UL).

0217.250MXEP offers the broadest regulatory approval scope (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE) and is suitable for applications requiring expanded international market compliance. Inventory availability is 2690 pcs.

0235.250HXEP is available with 724 pcs in stock and provides equivalent functionality with active product status and standard certifications (CE, CSA, KC, UL).

All substitutes maintain ROHS3 compliance and identical operating temperature ranges. Physical dimensions vary slightly within standard manufacturing tolerances for this fuse category.

Frequently Asked Questions (FAQ)

Q: Can 0235.250MXEP be used as a direct replacement for 5MFP 250-R?

A: Yes. Both parts share identical electrical ratings (250 mA, 250 V AC), response time (fast blow), package dimensions (5mm x 20mm axial), and operating temperature range (-55°C ~ 125°C). The 5MFP 250-R is obsolete; 0235.250MXEP is an active equivalent.

Q: What is the difference between 0235.250HXEP and 0235.250MXEP?

A: Both are Littelfuse 235 series fuses with identical electrical and mechanical specifications. The primary differences are packaging (both bulk) and minor variations in breaking capacity and DC cold resistance within acceptable tolerances for this fuse class. Both are suitable substitutes.

Q: Does 0217.250MXEP have different performance characteristics?

A: 0217.250MXEP maintains the same electrical ratings and response time as the other substitutes. It belongs to the Littelfuse 217 series and has a higher melting I²t value (0.04 vs. 0.0166) and different DC cold resistance (1.2325 Ohms). These variations are within acceptable parameters for fast-blow glass cartridge fuses and do not affect functional equivalence for the specified 250 mA, 250 V application.

Q: Are all substitutes RoHS compliant?

A: Yes. All substitute parts are ROHS3 compliant, matching the compliance status of the original 5MFP 250-R.

Q: Which substitute has the best availability?

A: 0235.250MXEP has the highest inventory level at 2968 pcs, followed by 0217.250MXEP at 2690 pcs, and 0235.250HXEP at 724 pcs.

Q: Do the physical dimension variations affect PCB layout?

A: The substitute parts have slightly larger physical dimensions (0.236" Dia x 0.886" L vs. 0.217" Dia x 0.827" L for the original). Verify PCB footprint clearance before design implementation, though standard 5mm x 20mm axial fuse holders accommodate these variations.