Equivalent & Substitute Parts for 5HFP 1.25-R

Part Overview

The 5HFP 1.25-R is a ceramic cartridge fuse manufactured by Bel Fuse Inc., rated at 1.25 A, 250 V AC/DC with fast-blow response characteristics. This through-hole component is designed for 5mm x 20mm form factor applications and is currently in active production status. Alternative equivalent parts become necessary when addressing supply chain constraints, regional availability requirements, or specific certification mandates for end-use applications.

Substiute Parts

5HFP 1.25-R

Bel Fuse Inc.In Stock: 22035HFP 1.25-R Datasheet

Current PartRFQ

0001.1005.PT

SCHURTER Inc.In Stock: 42130001.1005.PT Datasheet

DirectRFQ

02161.25MXEP

Littelfuse Inc.In Stock: 197302161.25MXEP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5HFP 1.25-R is determined by strict equivalence across the following electrical and mechanical parameters:

• Current Rating: 1.25 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Fuse Type: Cartridge, Ceramic (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 5mm x 20mm (Axial) form factor (exact match required)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity @ Rated Voltage: 1.5 kA (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

Both substitute parts listed below meet all specified electrical and mechanical criteria and are therefore direct equivalents suitable for component selection.

Parameter Comparison

Engineering Selection Recommendations

All three parts are in active production status and ROHS3 compliant. Selection between the 5HFP 1.25-R and its substitutes should be based on regional certification requirements and approval agency mandates:

• The 5HFP 1.25-R (Bel Fuse Inc.) provides the broadest certification coverage with CCC, CE, CSA, cULus, IMQ, PSE, SEMKO, and VDE approvals.
• The 0001.1005.PT (SCHURTER Inc.) carries cURus certification and is suitable for North American applications.
• The 02161.25MXEP (Littelfuse Inc.) provides comprehensive global certifications including CCC, CE, CSA, KC, PSE, SEMKO, UL, and VDE.

Physical dimensions vary slightly across manufacturers within the 5mm x 20mm form factor specification. Verify PCB footprint compatibility before final selection.

Frequently Asked Questions (FAQ)

Q: Can the 0001.1005.PT substitute for the 5HFP 1.25-R in all applications?

A: Yes, the 0001.1005.PT meets all electrical and mechanical parameters. However, verify that cURus certification satisfies your application's regional requirements, as it has narrower certification coverage than the 5HFP 1.25-R.

Q: What is the significance of the different Melting I²t values?

A: Melting I²t values (1.17, 0.538, and 0.48) indicate thermal energy dissipation characteristics. All three parts are rated for the same current and voltage, and the differences reflect manufacturer-specific design approaches within the fast-blow response classification.

Q: Are there physical compatibility concerns with the dimensional variations?

A: The three parts have minor dimensional differences within the 5mm x 20mm form factor. The 5HFP 1.25-R measures 5.50mm x 21.00mm, while the 0001.1005.PT and 02161.25MXEP measure 5.40mm x 22.50mm and 5.80mm x 22.50mm respectively. Confirm PCB hole spacing and holder clearances before substitution.

Q: Which substitute part has the best availability?

A: The 0001.1005.PT (SCHURTER Inc.) shows 4,117 pieces in stock, compared to 2,121 pieces for the 5HFP 1.25-R and 1,887 pieces for the 02161.25MXEP.

Q: Do all three parts support both AC and DC applications?

A: Yes, all three parts are rated for 250 V AC/DC operation and are suitable for both AC and DC circuit protection applications.