Equivalent & Substitute Parts for 5HF 1.25

Part Overview

The Bel Fuse Inc. 5HF 1.25 is a ceramic cartridge fuse rated at 1.25 A, 250 V AC/DC with a 5mm x 20mm form factor. This part is classified as obsolete, requiring identification of active equivalent and substitute components for ongoing system support and new designs. The 5HF 1.25 series requires a separate fuse holder for installation, distinguishing it from through-hole mounted variants. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer functional compatibility within the same application category.

Substiute Parts

5HF 1.25

Bel Fuse Inc.In Stock: 11635HF 1.25 Datasheet

Current PartRFQ

5HFP 1.25-R

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

DirectRFQ

5HF 1.25-R

Bel Fuse Inc.In Stock: 7815HF 1.25-R Datasheet

Parametric EquivalentRFQ

0001.1005

SCHURTER Inc.In Stock: 19240001.1005 Datasheet

DirectRFQ

02161.25HXP

Littelfuse Inc.In Stock: 854402161.25HXP Datasheet

SimilarRFQ

02161.25MXBP

Littelfuse Inc.In Stock: 108102161.25MXBP Datasheet

SimilarRFQ

02161.25MXP

Littelfuse Inc.In Stock: 199002161.25MXP Datasheet

SimilarRFQ

02161.25TXP

Littelfuse Inc.In Stock: 101402161.25TXP Datasheet

SimilarRFQ

02161.25VXP

Littelfuse Inc.In Stock: 83502161.25VXP Datasheet

SimilarRFQ

GDA-1.25A

Eaton - Electronics DivisionIn Stock: 1015GDA-1.25A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5HF 1.25 is determined by strict equivalence across the following parameters: current rating (1.25 A), voltage rating (250 V AC), fuse type (ceramic cartridge), package dimensions (5mm x 20mm), response time (fast blow), breaking capacity (1.5 kA), and mounting configuration (requires holder). Parts are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Equivalent (5HFP 1.25-R): Active production variant from the same manufacturer with identical electrical specifications but through-hole mounting configuration. This part shares the same series lineage and approval certifications.

Parametric Equivalent (5HF 1.25-R): Active production variant from Bel Fuse Inc. with identical electrical and mechanical specifications to the obsolete 5HF 1.25, maintaining the requires-holder mounting type.

Cross-Manufacturer Substitutes: Parts from SCHURTER Inc. (0001.1005), Littelfuse Inc. (02161.25HXP, 02161.25MXBP, 02161.25MXP, 02161.25TXP, 02161.25VXP), and Eaton Electronics Division (GDA-1.25A) that meet all core electrical and mechanical parameters while maintaining ceramic cartridge construction and 5mm x 20mm form factor.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: The 5HF 1.25-R from Bel Fuse Inc. is the direct parametric equivalent, maintaining identical electrical and mechanical specifications while offering active product status and ROHS3 compliance. This part preserves the requires-holder mounting configuration of the original 5HF 1.25.

Alternative from Same Manufacturer: The 5HFP 1.25-R provides active Bel Fuse production with identical electrical ratings but implements through-hole axial mounting. Selection of this variant requires PCB redesign to accommodate the different mounting interface.

Cross-Manufacturer Alternatives: Littelfuse Inc. parts (02161.25HXP, 02161.25MXBP, 02161.25MXP, 02161.25TXP, 02161.25VXP) and SCHURTER Inc. 0001.1005 meet all core electrical and mechanical parameters with active product status and ROHS3 compliance. Eaton GDA-1.25A provides functional equivalence with active status but does not specify RoHS compliance status.

All substitute parts maintain the 1.25 A current rating, 250 V AC voltage rating, ceramic cartridge construction, 5mm x 20mm form factor, fast-blow response, and 1.5 kA breaking capacity required for direct functional replacement.

Frequently Asked Questions (FAQ)

Q: Can the 5HFP 1.25-R replace the obsolete 5HF 1.25 directly?

A: The 5HFP 1.25-R matches all electrical specifications but uses through-hole axial mounting instead of the requires-holder configuration. Direct PCB substitution is not possible without redesign. The 5HF 1.25-R is the direct mechanical and electrical equivalent.

Q: What is the difference between "Requires Holder" and "Through Hole" mounting?

A: Requires Holder fuses (5HF 1.25, 5HF 1.25-R, 0001.1005, Littelfuse 216 series, GDA-1.25A) install into a separate fuse holder component. Through Hole fuses (5HFP 1.25-R) solder directly to PCB pads. These are incompatible mounting approaches requiring different PCB layouts.

Q: Are all substitute parts RoHS compliant?

A: The 5HF 1.25-R, 5HFP 1.25-R, 0001.1005, and all Littelfuse 216 series variants (02161.25HXP, 02161.25MXBP, 02161.25MXP, 02161.25TXP, 02161.25VXP) are ROHS3 compliant. The Eaton GDA-1.25A does not specify RoHS status in the provided data.

Q: Do all substitute parts have identical melting I²t values?

A: No. The original 5HF 1.25 has a melting I²t of 1.17. The 5HF 1.25-R matches this value. Littelfuse parts (02161.25HXP, 02161.25MXBP, 02161.25MXP, 02161.25TXP, 02161.25VXP) have a melting I²t of 0.48. SCHURTER 0001.1005 has 0.538. Eaton GDA-1.25A has 0.313. These differences reflect different thermal response characteristics within the fast-blow category.

Q: What approval certifications are common across all parts?

A: All parts carry CCC and VDE certifications. The original 5HF 1.25 includes CE, CSA, IMQ, PSE, SEMKO, and UL. Active variants add cULus or cURus certifications. Littelfuse parts include KC certification. Eaton GDA-1.25A carries SEMKO and UR certifications.

Q: Can I use a 5mm x 20mm fuse from a different current rating as a substitute?

A: No. Current rating is a core electrical parameter. Only 1.25 A rated fuses are acceptable substitutes for the 5HF 1.25. Using a different current rating violates circuit protection requirements.