BK/PCB-2-1/2-SD Equivalent & Substitute Parts

Part Overview

The BK/PCB-2-1/2-SD is a 2.5 A board mount fuse rated for 250 V AC and 450 V DC operation, manufactured by Eaton - Electronics Division as part of the PC-Tron® series. This component is classified as obsolete, with 922 pieces currently in stock. The fast-blow response time and radial box package configuration make it suitable for through-hole PCB mounting applications requiring circuit protection in industrial and commercial equipment.

Due to its obsolete product status, direct replacement with active production equivalents is necessary for new designs and long-term supply chain continuity. Substitute parts maintain identical electrical and mechanical specifications while offering improved availability and compliance with current regulatory standards.

Substiute Parts

BK/PCB-2-1/2-SD

Eaton - Electronics DivisionIn Stock: 1019BK/PCB-2-1/2-SD Datasheet

Current PartRFQ

BK/PCB-2-1/2-R

Eaton - Electronics DivisionIn Stock: 10217BK/PCB-2-1/2-R Datasheet

DirectRFQ

BK/PCC-2-1/2-R

Eaton - Electronics DivisionIn Stock: 4467BK/PCC-2-1/2-R Datasheet

Parametric EquivalentRFQ

BK/PCH-2-1/2-R

Eaton - Electronics DivisionIn Stock: 980BK/PCH-2-1/2-R Datasheet

Parametric EquivalentRFQ

PCB-2-1/2-R

Eaton - Electronics DivisionIn Stock: 1180PCB-2-1/2-R Datasheet

Parametric EquivalentRFQ

PCC-2-1/2-R

Eaton - Electronics DivisionIn Stock: 931PCC-2-1/2-R Datasheet

Parametric EquivalentRFQ

PCH-2-1/2-R

Eaton - Electronics DivisionIn Stock: 1217PCH-2-1/2-R Datasheet

Parametric EquivalentRFQ

80812500075

Littelfuse Inc.In Stock: 99880812500075 Datasheet

DirectRFQ

80812500440

Littelfuse Inc.In Stock: 75880812500440 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters:

Electrical Specifications: Current rating (2.5 A), AC voltage rating (250 V), DC voltage rating (450 V), response time (Fast Blow), breaking capacity (50A AC, 5.9kA DC minimum), and melting I²t (0.3).

Mechanical Specifications: Mounting type (Through Hole), fuse type (Board Mount, Cartridge Style Excluded), package configuration (Radial, Box), and physical dimensions (0.350" L x 0.184" W x 0.345" H).

Regulatory Compliance: Approval agencies (CSA, UL) and ECCN/HTSUS classifications.

Substitute parts are grouped into two categories:

Category 1 - Eaton PC-Tron® Series (Active Production): BK/PCB-2-1/2-R, BK/PCC-2-1/2-R, BK/PCH-2-1/2-R, PCB-2-1/2-R, PCC-2-1/2-R, and PCH-2-1/2-R. These parts maintain identical electrical and mechanical parameters with improved RoHS3 compliance and active product status.

Category 2 - Littelfuse TE5® 808 Series (Cross-Manufacturer): 80812500075 and 80812500440. These parts meet all electrical and mechanical requirements with enhanced breaking capacity (100A AC, 10kA DC) and extended operating temperature range (-40°C ~ 125°C).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Eaton PC-Tron® Series):

Select BK/PCB-2-1/2-R, BK/PCC-2-1/2-R, BK/PCH-2-1/2-R, PCB-2-1/2-R, PCC-2-1/2-R, or PCH-2-1/2-R when maintaining design continuity within the Eaton PC-Tron® product family is required. All six parts are in active production status with ROHS3 compliance and identical electrical/mechanical specifications to the obsolete BK/PCB-2-1/2-SD. These parts carry CSA and UL approvals consistent with the original component. Inventory availability ranges from 953 to 10,134 pieces across the variants.

For Cross-Manufacturer Substitution (Littelfuse TE5® 808 Series):

Select 80812500075 or 80812500440 when enhanced performance margins are acceptable or required. Both Littelfuse parts exceed the original breaking capacity specifications (100A AC vs. 50A AC; 10kA DC vs. 5.9kA DC) and provide extended operating temperature range (-40°C ~ 125°C). These parts carry cULus approval and ROHS3 compliance. The lower melting I²t value (0.0898 vs. 0.3) indicates faster thermal response. Physical dimensions are equivalent (0.350" L x 0.183" W x 0.350" H vs. 0.350" L x 0.184" W x 0.345" H), with negligible tolerance differences suitable for standard PCB mounting.

Compliance Considerations:

All substitute parts maintain the required ECCN (EAR99) and HTSUS (8536.10.0040) classifications. Eaton variants achieve ROHS3 compliance, addressing regulatory requirements absent in the obsolete original. Littelfuse variants provide REACH Unaffected status with MSL 1 (Unlimited) moisture sensitivity, improving handling and storage flexibility.

Frequently Asked Questions (FAQ)

Q: Can BK/PCB-2-1/2-R be used as a direct replacement for BK/PCB-2-1/2-SD?

A: Yes. BK/PCB-2-1/2-R is a direct substitute with identical electrical ratings (2.5 A, 250 V AC, 450 V DC), response time (Fast Blow), breaking capacity (50A AC, 5.9kA DC), and physical dimensions (0.350" L x 0.184" W x 0.345" H). The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. Non-compliant). No circuit redesign is required.

Q: What is the difference between the six Eaton PC-Tron® variants (BK/PCB-2-1/2-R, BK/PCC-2-1/2-R, BK/PCH-2-1/2-R, PCB-2-1/2-R, PCC-2-1/2-R, PCH-2-1/2-R)?

A: All six parts share identical electrical and mechanical specifications. The differences are in packaging designation and internal product line coding within Eaton's PC-Tron® series. From an engineering perspective, they are parametrically equivalent and interchangeable. Selection should be based on inventory availability and internal part numbering conventions.

Q: How do Littelfuse 80812500075 and 80812500440 differ from the Eaton parts?

A: Both Littelfuse parts maintain the same current rating (2.5 A), voltage ratings (250 V AC, 450 V DC), response time (Fast Blow), and physical dimensions as the Eaton parts. However, they offer enhanced breaking capacity (100A AC, 10kA DC vs. 50A AC, 5.9kA DC) and extended operating temperature range (-40°C ~ 125°C). The melting I²t is lower (0.0898 vs. 0.3), indicating faster thermal response. These differences represent performance enhancements rather than incompatibilities.

Q: Are the physical dimensions of Littelfuse parts compatible with existing PCB layouts designed for Eaton fuses?

A: Yes. Littelfuse 80812500075 and 80812500440 have dimensions of 0.350" L x 0.183" W x 0.350" H, compared to 0.350" L x 0.184" W x 0.345" H for Eaton parts. The differences (0.001" width, 0.005" height) are within standard PCB mounting tolerances and do not require layout modifications.

Q: Which substitute part should be selected for new designs?

A: For new designs, select from the active Eaton PC-Tron® variants (BK/PCB-2-1/2-R, BK/PCC-2-1/2-R, BK/PCH-2-1/2-R, PCB-2-1/2-R, PCC-2-1/2-R, or PCH-2-1/2-R) for supply chain continuity within a single manufacturer ecosystem. Alternatively, select Littelfuse 80812500075 or 80812500440 if enhanced breaking capacity and extended temperature range provide design margin benefits. Both options carry current regulatory approvals (CSA/UL for Eaton; cULus for Littelfuse).

Q: Do all substitute parts meet the same approval standards as the original BK/PCB-2-1/2-SD?

A: The Eaton PC-Tron® variants maintain CSA and UL approvals identical to the original. Littelfuse parts carry cULus approval, which encompasses both CSA and UL standards. All parts are ROHS3 compliant, exceeding the non-compliant status of the obsolete original. ECCN and HTSUS classifications remain consistent across all parts.

Q: What is the inventory status of substitute parts?

A: Eaton BK/PCB-2-1/2-R has the highest availability (10,134 pieces). Other Eaton variants range from 953 to 4,389 pieces. Littelfuse 80812500075 and 80812500440 have 893 and 743 pieces respectively. All parts are listed as new original stock.