Littelfuse 0253.125V Fuse Board Mount Equivalent & Substitute Parts

Part Overview

The Littelfuse 0253.125V is a 125 mA, 125 V AC/DC board mount fuse in axial package configuration, part of the PICO® II 253 series. This fast-blow fuse is designed for through-hole mounting applications requiring overcurrent protection in circuits rated up to 125 V AC or DC. The part maintains active product status with full RoHS3 compliance and CSA/QPL/UR approvals. Substitute parts are identified when equivalent electrical ratings and mechanical compatibility allow direct circuit board replacement without performance degradation.

Substiute Parts

0253.125V

Littelfuse Inc.In Stock: 9260253.125V Datasheet

Current PartRFQ

0253.125M

Littelfuse Inc.In Stock: 14560253.125M Datasheet

Parametric EquivalentRFQ

7010.6310.13

SCHURTER Inc.In Stock: 11667010.6310.13 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0253.125V are identified based on the following critical parameters that must match or exceed the main part specifications:

Mandatory Matching Parameters:

• Current Rating: 125 mA
• Voltage Rating (AC): 125 V minimum
• Voltage Rating (DC): 125 V minimum
• Response Time: Fast Blow
• Mounting Type: Through Hole
• Fuse Type: Board Mount (Cartridge Style Excluded)

Allowable Variations:

• Package configuration (Axial vs. Cartridge, Non-Standard Axial) when mechanical fit permits board-level integration
• Physical dimensions within tolerance for through-hole mounting
• Breaking capacity may exceed rated values
• Operating temperature range may be narrower than the main part
• Melting I²t values may differ within acceptable thermal response parameters

The 0253.125M (Littelfuse) and 7010.6310.13 (SCHURTER) meet these criteria and are classified as direct parametric equivalents.

Parameter Comparison

Engineering Selection Recommendations

0253.125M (Littelfuse): This part is a parametric equivalent with identical electrical ratings, physical dimensions, and operating temperature range. Both parts belong to the same manufacturer family (PICO® II 253 series) and carry equivalent certifications (CSA, QPL, UR). Selection of this substitute introduces no performance or compatibility risk and is suitable for direct replacement in existing designs.

7010.6310.13 (SCHURTER): This part meets all critical electrical parameters (125 mA, 125 V AC/DC, Fast Blow, 300 A DC breaking capacity) and maintains RoHS3 compliance. Physical dimensions differ slightly (0.093" Dia x 0.315" L vs. 0.103" Dia x 0.280" L), requiring verification of board-level mechanical fit. Operating temperature range is reduced to -55°C to 85°C; applications requiring operation above 85°C must retain the main part or 0253.125M. Approval agency information is not provided for this substitute. Selection requires confirmation of mechanical compatibility with printed circuit board layout and hole spacing.

Frequently Asked Questions (FAQ)

Q: Can 0253.125M be used as a direct drop-in replacement for 0253.125V?

A: Yes. The 0253.125M is electrically and mechanically identical to the 0253.125V, with matching current rating (125 mA), voltage ratings (125 V AC/DC), response time (Fast Blow), physical dimensions (0.103" Dia x 0.280" L), and operating temperature range (-55°C to 125°C). Both parts carry the same certifications and RoHS3 compliance status.

Q: What are the key differences between 7010.6310.13 and the main part?

A: The 7010.6310.13 matches all electrical specifications but differs in three areas: (1) Physical dimensions are slightly smaller (0.093" Dia x 0.315" L vs. 0.103" Dia x 0.280" L), requiring board-level mechanical verification; (2) Operating temperature maximum is 85°C instead of 125°C; (3) Approval agency certifications are not specified. Electrical performance and breaking capacity are equivalent.

Q: Can 7010.6310.13 be used in applications requiring operation above 85°C?

A: No. The 7010.6310.13 is rated for -55°C to 85°C maximum operating temperature. Applications requiring sustained operation above 85°C must use 0253.125V or 0253.125M, both rated to 125°C.

Q: Are there mechanical compatibility concerns with the SCHURTER substitute?

A: Yes. The 7010.6310.13 has different physical dimensions (0.093" Dia x 0.315" L) compared to the main part (0.103" Dia x 0.280" L). Board-level hole spacing, lead retention, and mechanical fit must be verified before substitution. The Littelfuse 0253.125M maintains identical dimensions and requires no mechanical re-evaluation.

Q: Do all three parts carry the same regulatory approvals?

A: No. The 0253.125V and 0253.125M both carry CSA, QPL, and UR approvals. The 7010.6310.13 does not list approval agency certifications in the provided specifications. Applications requiring specific regulatory compliance should confirm approval status with the manufacturer before selection.

Q: What is the significance of the melting I²t parameter difference?

A: The 0253.125V and 0253.125M both have a melting I²t of 0.00174, while the 7010.6310.13 has 0.0045. This indicates the SCHURTER part has a higher thermal energy threshold before melting. Both values are within acceptable ranges for 125 mA fast-blow fuses; however, the difference reflects different internal construction and thermal response characteristics. Selection should be based on circuit-specific thermal requirements and breaking capacity needs.