5HFP 125 Ceramic Fuse - Equivalent & Substitute Parts

Part Overview

The 5HFP 125 is a 125 mA, 250 V AC/DC ceramic cartridge fuse with fast-blow response characteristics, designed for through-hole mounting in 5mm x 20mm axial package configuration. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design support and procurement continuity. The substitute part maintains functional equivalence across all critical electrical and mechanical parameters while offering improved availability and compliance status.

Substiute Parts

5HFP 125

Bel Fuse Inc.In Stock: 9535HFP 125 Datasheet

Current PartRFQ

0216.125MXEP

Littelfuse Inc.In Stock: 156540216.125MXEP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 5HFP 125 with the 0216.125MXEP is based on strict equivalence across the following critical parameters:

• Current Rating: Both parts rated at 125 mA
• Voltage Rating (AC): Both rated at 250 V
• Fuse Type: Both are ceramic cartridge fuses
• Response Time: Both exhibit fast-blow characteristics
• Mounting Configuration: Both are through-hole, axial-mounted components
• Breaking Capacity: Both rated at 1.5 kA @ rated voltage
• Operating Temperature Range: Both operate across -55°C to 125°C
• Package Footprint: Both utilize 5mm x 20mm axial package dimensions

The 0216.125MXEP represents a direct functional equivalent from an active manufacturer with enhanced compliance certifications and current production status.

Parameter Comparison

Engineering Selection Recommendations

The 0216.125MXEP (Littelfuse Inc., Series 216) is the qualified substitute for the obsolete 5HFP 125. Selection is based on:

• Functional equivalence across all critical electrical parameters (current, voltage, response time, breaking capacity)
• Mechanical compatibility with existing through-hole PCB footprints designed for 5mm x 20mm axial packages
• Active production status ensuring procurement availability and supply chain continuity
• Enhanced regulatory compliance: ROHS3 certification versus non-compliant status of the original part
• Expanded approval agency certifications including SEMKO and VDE, providing broader market acceptance
• Marginal variations in melting I²t (0.00546 vs. 0.005) and DC cold resistance (3.675 vs. 2.78 Ohms) remain within acceptable tolerance for circuit protection applications

Frequently Asked Questions (FAQ)

Q: Can the 0216.125MXEP be used as a direct replacement for the 5HFP 125 in existing designs?

A: Yes. Both parts share identical current ratings (125 mA), voltage ratings (250 V AC), response characteristics (fast-blow), and package dimensions (5mm x 20mm axial). Through-hole mounting compatibility is maintained.

Q: What are the differences between these two fuses?

A: The primary differences are product status (obsolete vs. active), RoHS compliance (non-compliant vs. ROHS3 compliant), and regulatory certifications. The 0216.125MXEP includes additional approvals (SEMKO, VDE). Minor variations exist in melting I²t and DC cold resistance, which do not affect circuit protection function.

Q: Are there any physical dimension differences that could affect PCB layout?

A: Both parts are specified for 5mm x 20mm axial packages. The 0216.125MXEP has slightly larger actual dimensions (0.236" Dia x 0.886" L vs. 0.217" Dia x 0.827" L), but these remain within standard axial fuse tolerances and do not require PCB redesign.

Q: Which certifications should I prioritize when selecting between these parts?

A: The 0216.125MXEP provides broader certification coverage (CCC, CE, CSA, SEMKO, UL, VDE) compared to the 5HFP 125 (CCC, CE, CSA, UL). Selection depends on target market requirements and regional compliance mandates.

Q: Is the RoHS3 compliance of the 0216.125MXEP a requirement for my application?

A: RoHS3 compliance is mandatory for products sold in the European Union and increasingly required by global OEMs. The 0216.125MXEP meets this requirement; the 5HFP 125 does not.