BK/EFF-1.6 Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The BK/EFF-1.6 is a 1.6 A 250 V AC/DC board mount fuse manufactured by Eaton - Electronics Division. This through-hole radial, can-style fuse is designed for fast-blow protection in electronic circuits. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility with existing circuit designs and PCB layouts.

Substiute Parts

BK/EFF-1.6

Eaton - Electronics DivisionIn Stock: 720BK/EFF-1.6 Datasheet

Current PartRFQ

SR-5F-1.6A-BK

Eaton - Electronics DivisionIn Stock: 1064SR-5F-1.6A-BK Datasheet

SimilarRFQ

MRF 1.6-AMMO

Bel Fuse Inc.In Stock: 825MRF 1.6-AMMO Datasheet

DirectRFQ

MRF 1.6-BULK

Bel Fuse Inc.In Stock: 1758MRF 1.6-BULK Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BK/EFF-1.6 is determined by strict equivalence across the following electrical and mechanical parameters:

Mandatory Matching Parameters:

• Current Rating: 1.6 A
• Voltage Rating (AC): 250 V
• Response Time: Fast Blow
• Mounting Type: Through Hole
• Fuse Type: Board Mount (Cartridge Style Excluded)
• Package / Case: Radial, Can, Vertical

Physical Compatibility Considerations:

• Physical dimensions must accommodate existing PCB footprints and lead spacing
• Operating temperature range must support the application environment

All identified substitute parts meet these core electrical and mechanical requirements. Variations in secondary parameters such as breaking capacity, melting I²t, DC cold resistance, and approval agencies reflect manufacturer design differences while maintaining functional equivalence for the specified 1.6 A 250 V AC/DC application.

Parameter Comparison

Engineering Selection Recommendations

SR-5F-1.6A-BK (Eaton - Electronics Division)

This substitute maintains manufacturer continuity with the original BK/EFF-1.6 component. Both are manufactured by Eaton - Electronics Division and share identical electrical specifications (1.6 A, 250 V AC, fast-blow response). The SR-5F-1.6A-BK is active and carries ROHS3 compliance certification. Physical dimensions differ slightly (0.335" Dia x 0.319" H versus 0.329" Dia x 0.303" H), requiring verification of PCB footprint compatibility. The higher melting I²t value (6.9 versus 1.1) indicates different thermal response characteristics. This part is suitable for applications where Eaton component continuity is preferred and PCB layout accommodates the dimensional variance.

MRF 1.6-AMMO (Bel Fuse Inc.)

This substitute is manufactured by Bel Fuse Inc. and provides identical electrical specifications with active product status. Physical dimensions match the original BK/EFF-1.6 precisely (0.329" Dia x 0.303" H), ensuring direct PCB compatibility without layout modifications. The MRF 1.6-AMMO carries comprehensive approval certifications including AEC-Q200, CE, CSA, cULus, PSE, SEMKO, and VDE, exceeding the original part's certification scope. Breaking capacity is reduced to 35 A (versus 50 A), which is acceptable for applications not requiring the higher breaking capacity. Packaging is Tape & Box (TB), suitable for automated assembly processes. This part is recommended for applications requiring exact physical compatibility and extended regulatory compliance.

MRF 1.6-BULK (Bel Fuse Inc.)

This substitute is functionally identical to the MRF 1.6-AMMO, manufactured by Bel Fuse Inc. with the same electrical specifications, certifications, and physical dimensions. The primary distinction is bulk packaging, which is appropriate for high-volume procurement and manual assembly operations. The MRF 1.6-BULK offers the highest inventory availability (1739 Pcs) among all substitutes. This part is recommended for cost-optimized procurement in high-volume applications where bulk packaging is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the SR-5F-1.6A-BK be used as a direct replacement for the BK/EFF-1.6 without PCB modifications?

A: The SR-5F-1.6A-BK has slightly larger physical dimensions (0.335" Dia x 0.319" H versus 0.329" Dia x 0.303" H). PCB footprint compatibility must be verified before substitution. If the original PCB layout provides adequate clearance, direct substitution is possible. If clearance is marginal, PCB layout modifications may be required.

Q: What is the significance of the different melting I²t values among the substitute parts?

A: Melting I²t is a thermal characteristic that defines the fuse's response to overcurrent conditions. The BK/EFF-1.6 has a melting I²t of 1.1, while the SR-5F-1.6A-BK has 6.9, and both Bel Fuse MRF variants have 1.4. These differences indicate varying thermal response times under identical overcurrent conditions. For applications with specific thermal protection requirements, the melting I²t value must be evaluated against circuit protection specifications.

Q: Are the MRF 1.6-AMMO and MRF 1.6-BULK electrically identical?

A: Yes. Both MRF variants are electrically and mechanically identical. The only difference is packaging: MRF 1.6-AMMO is supplied in Tape & Box (TB) format for automated assembly, while MRF 1.6-BULK is supplied in bulk format for manual assembly or high-volume procurement. Selection between these two depends on assembly process requirements and procurement volume.

Q: Which substitute part has the broadest regulatory compliance?

A: Both MRF 1.6-AMMO and MRF 1.6-BULK carry identical comprehensive certifications: AEC-Q200, CE, CSA, cULus, PSE, SEMKO, and VDE. These certifications exceed the original BK/EFF-1.6 (SEMKO, UL) and the SR-5F-1.6A-BK (cULus, PSE). The Bel Fuse MRF variants are suitable for applications requiring compliance across multiple regulatory jurisdictions.

Q: Does the operating temperature range difference between parts affect substitution?

A: The BK/EFF-1.6 and both MRF variants operate across -55°C ~ 125°C, while the SR-5F-1.6A-BK operates across -40°C ~ 125°C. For applications requiring operation below -40°C, the SR-5F-1.6A-BK is not suitable. The MRF variants and original BK/EFF-1.6 support the full -55°C ~ 125°C range.

Q: What is the impact of the different breaking capacity ratings?

A: The BK/EFF-1.6 and SR-5F-1.6A-BK have breaking capacities of 50 A, while both MRF variants have 35 A. Breaking capacity defines the maximum fault current the fuse can safely interrupt. For applications with fault currents exceeding 35 A, the MRF variants may not provide adequate protection. Circuit analysis is required to determine if 35 A breaking capacity is sufficient for the intended application.

Q: Is RoHS3 compliance required for the application?

A: The SR-5F-1.6A-BK, MRF 1.6-AMMO, and MRF 1.6-BULK are all ROHS3 compliant. The original BK/EFF-1.6 does not specify RoHS status. For applications subject to RoHS3 requirements, any of the three active substitute parts are acceptable.