MQ 2.5 Equivalent & Substitute Parts

Part Overview

The MQ 2.5 is a 2.5 A board mount axial fuse rated for 125 V AC/DC operation, manufactured by Bel Fuse Inc. This component is classified as obsolete. Due to its discontinued status, equivalent substitute parts from active manufacturers are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Substiute Parts

MQ 2.5

Bel Fuse Inc.In Stock: 1177MQ 2.5 Datasheet

Current PartRFQ

025102.5MXL

Littelfuse Inc.In Stock: 1987025102.5MXL Datasheet

DirectRFQ

025102.5NRT1L

Littelfuse Inc.In Stock: 15918025102.5NRT1L Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MQ 2.5 is determined by strict equivalence across the following parameters:

• Current Rating: 2.5 A (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Fuse Type: Board Mount, Cartridge Style Excluded (exact match required)
• Package / Case: Axial (exact match required)
• Breaking Capacity: 50 A AC, 300 A DC (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

The substitute parts 025102.5MXL and 025102.5NRT1L, both from Littelfuse Inc. PICO® II 251 series, meet all electrical and mechanical parameters. Both are active products with enhanced compliance certifications and improved availability compared to the obsolete MQ 2.5.

Parameter Comparison

Engineering Selection Recommendations

Both 025102.5MXL and 025102.5NRT1L are direct functional equivalents to the MQ 2.5. Selection between these two substitute parts should be based on packaging requirements:

025102.5MXL is supplied in Bulk packaging and is suitable for high-volume manufacturing environments where loose component handling is acceptable.

025102.5NRT1L is supplied in Cut Tape (CT) packaging and is suitable for automated assembly processes and applications requiring controlled component dispensing.

Both substitute parts are manufactured by Littelfuse Inc., an active producer with expanded regulatory approvals including CCC, PSE, and TUV certifications in addition to the CSA and cURus certifications held by the original MQ 2.5. Both substitute parts are ROHS3 compliant, providing enhanced environmental compliance compared to the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can 025102.5MXL and 025102.5NRT1L be used interchangeably with MQ 2.5?

A: Yes. Both parts meet all electrical and mechanical parameters required for direct substitution. The difference between them is packaging format only: Bulk versus Cut Tape.

Q: What is the primary difference between the two substitute parts?

A: 025102.5MXL is packaged in Bulk format, while 025102.5NRT1L is packaged in Cut Tape (CT) format. Electrical and mechanical specifications are identical.

Q: Are there physical dimension differences between MQ 2.5 and the substitute parts?

A: The MQ 2.5 has a diameter of 0.125" (3.18 mm), while both substitute parts have a diameter of 0.110" (2.80 mm). Both maintain the same length of 0.280" (7.10-7.11 mm). These dimensional differences do not affect electrical performance or board mount compatibility for standard through-hole applications.

Q: What certifications do the substitute parts carry?

A: Both 025102.5MXL and 025102.5NRT1L carry CCC, CSA, cURus, PSE, and TUV approvals. The original MQ 2.5 carries CE, CSA, and cURus approvals. The substitute parts provide broader regulatory coverage.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both 025102.5MXL and 025102.5NRT1L are ROHS3 compliant. RoHS status for the original MQ 2.5 is not specified.

Q: Which substitute part should be selected for automated assembly?

A: 025102.5NRT1L in Cut Tape (CT) packaging is designed for automated assembly processes. 025102.5MXL in Bulk packaging is suitable for manual or semi-automated handling.