BK/MDQ-V-1/8 Equivalent & Substitute Parts

Part Overview

The BK/MDQ-V-1/8 is a 125 mA, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Eaton - Electronics Division. This through-hole mounted fuse is designed for circuit protection in applications requiring a 3AB, 3AG form factor with 1/4" x 1-1/4" (Axial) dimensions. The part is currently active in production with 1187 pieces available in inventory. Equivalent substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity when the primary part becomes unavailable or when design requirements permit alternative qualified components.

Substiute Parts

BK/MDQ-V-1/8

Eaton - Electronics DivisionIn Stock: 1258BK/MDQ-V-1/8 Datasheet

Current PartRFQ

BK/MDL-V-1/8-R

Eaton - Electronics DivisionIn Stock: 822BK/MDL-V-1/8-R Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BK/MDQ-V-1/8 are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Electrical Parameters (Must Match):

• Current Rating: 125 mA
• Voltage Rating (AC): 250 V
• Response Time: Slow Blow
• Breaking Capacity @ Rated Voltage: 35 A

Mechanical Parameters (Must Match):

• Fuse Type: Cartridge, Glass
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial)
• Mounting Type: Through Hole
• Size / Dimension: 0.266" Dia x 1.292" L (6.76mm x 32.82mm)

The BK/MDL-V-1/8-R meets all mandatory electrical and mechanical parameters and is classified as a parametric equivalent substitute.

Parameter Comparison

Engineering Selection Recommendations

Both the BK/MDQ-V-1/8 and BK/MDL-V-1/8-R are active production parts from Eaton - Electronics Division with identical electrical and mechanical specifications. Selection between these parts should be based on the following factors:

RoHS Compliance Requirement: The BK/MDL-V-1/8-R is RoHS Compliant, while the BK/MDQ-V-1/8 is RoHS non-compliant. Applications subject to RoHS regulations must use the BK/MDL-V-1/8-R.

Regulatory Certification: The BK/MDL-V-1/8-R carries CE certification in addition to CSA and UL approvals. The BK/MDQ-V-1/8 carries CSA and UL approvals. Selection depends on regional regulatory requirements.

Inventory Availability: The BK/MDQ-V-1/8 has 1187 pieces in stock, while the BK/MDL-V-1/8-R has 746 pieces available. Both parts maintain adequate inventory for procurement.

Electrical Performance: Both parts exhibit identical current rating, voltage rating, response time, and breaking capacity. DC Cold Resistance values differ (21.5 Ohms vs. 12.238 Ohms) but do not affect substitution eligibility for standard circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can the BK/MDL-V-1/8-R be used as a direct replacement for the BK/MDQ-V-1/8?

A: Yes. Both parts meet identical electrical and mechanical specifications: 125 mA current rating, 250 V AC voltage rating, slow-blow response time, 35 A breaking capacity, and 3AB, 3AG form factor with 1/4" x 1-1/4" dimensions. Both are through-hole mounted cartridge glass fuses from Eaton - Electronics Division.

Q: What is the difference between these two parts?

A: The primary differences are RoHS compliance status and regulatory certifications. The BK/MDL-V-1/8-R is RoHS Compliant with CE, CSA, and UL approvals. The BK/MDQ-V-1/8 is RoHS non-compliant with CSA and UL approvals. DC Cold Resistance also differs between the two parts.

Q: Which part should I select for a new design?

A: Selection depends on regulatory requirements. For applications requiring RoHS compliance or CE certification, use the BK/MDL-V-1/8-R. For applications without these requirements, either part is acceptable based on availability and inventory considerations.

Q: Are the physical dimensions identical?

A: Yes. Both parts have identical dimensions of 0.266" Dia x 1.292" L (6.76mm x 32.82mm) and use the same 3AB, 3AG package form factor. They are mechanically interchangeable in through-hole mounting applications.

Q: Can I mix these parts in the same circuit board assembly?

A: Yes. Both parts are electrically and mechanically equivalent and carry appropriate regulatory approvals. They can be used interchangeably in the same application.

Q: What is the significance of the different DC Cold Resistance values?

A: The DC Cold Resistance values (21.5 Ohms for BK/MDQ-V-1/8 and 12.238 Ohms for BK/MDL-V-1/8-R) reflect internal construction differences but do not affect circuit protection performance at the specified 125 mA current rating and 250 V voltage rating.