Littelfuse 0253.125M Equivalent & Substitute Parts

Part Overview

The Littelfuse 0253.125M is a 125 mA, 125 V AC/DC board mount fuse in the PICO® II 253 series, designed for through-hole axial mounting applications. This component provides fast-blow protection in compact form factor suitable for circuit board integration. The part maintains active product status with 1398 units in current inventory. Substitute parts are identified to support procurement flexibility, design revisions, or supply chain continuity when the primary part becomes unavailable.

Substiute Parts

0253.125M

Littelfuse Inc.In Stock: 14560253.125M Datasheet

Current PartRFQ

7010.6310.13

SCHURTER Inc.In Stock: 11667010.6310.13 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 0253.125M is determined by matching the following critical parameters:

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

The SCHURTER 7010.6310.13 meets all mandatory electrical parameters and mounting requirements, qualifying it as a direct substitute. Both parts share identical current and voltage ratings, fast-blow response characteristics, and through-hole board mount configuration. Physical dimensions and thermal characteristics differ within acceptable tolerance for equivalent functional performance.

Parameter Comparison

Engineering Selection Recommendations

Both the Littelfuse 0253.125M and SCHURTER 7010.6310.13 are active products with current inventory availability. Selection between these parts should be based on the following factors:

The Littelfuse 0253.125M offers a higher maximum operating temperature of 125°C compared to the SCHURTER substitute at 85°C. Applications requiring operation at elevated temperatures above 85°C necessitate the Littelfuse part.

The SCHURTER 7010.6310.13 provides higher breaking capacity at rated voltage (300A versus 50A AC/300A DC for Littelfuse) and elevated melting I²t characteristics. Applications with higher fault current requirements may benefit from the SCHURTER specification.

Both parts maintain ROHS3 compliance and REACH unaffected status, supporting environmental regulatory requirements. Both carry active product status with established supply chains.

Physical package differences exist: Littelfuse uses standard axial configuration while SCHURTER employs cartridge non-standard axial form factor. PCB footprint compatibility must be verified during design integration.

Frequently Asked Questions (FAQ)

Q: Can the SCHURTER 7010.6310.13 replace the Littelfuse 0253.125M in all applications?

A: Electrical substitution is valid for applications operating at or below 85°C. Applications requiring operation above 85°C require the Littelfuse part due to its 125°C maximum operating temperature rating. Physical package differences require PCB footprint verification.

Q: What are the key differences between these substitute parts?

A: Both parts share identical current ratings (125 mA), voltage ratings (125 V AC/DC), and response time (fast blow). Primary differences include operating temperature range (Littelfuse: -55°C to 125°C; SCHURTER: -55°C to 85°C), breaking capacity specifications, melting I²t values, and physical package form factor (axial versus cartridge non-standard axial).

Q: Are there any compliance or certification differences?

A: The Littelfuse 0253.125M carries CSA, QPL, and UR approvals. The SCHURTER 7010.6310.13 does not list specific approval agencies in the provided data. Both parts are ROHS3 compliant and REACH unaffected. Verify approval requirements for your specific application before substitution.

Q: How do the melting I²t values affect substitution?

A: The SCHURTER part exhibits higher melting I²t (0.0045 versus 0.00174), indicating different thermal response characteristics. This parameter affects fuse response time under fault conditions and must be evaluated against circuit protection requirements.

Q: Will the physical package difference affect PCB integration?

A: The Littelfuse part uses standard axial packaging while the SCHURTER uses cartridge non-standard axial configuration. Physical dimensions differ (Littelfuse: 0.103" Dia x 0.280" L; SCHURTER: 0.093" Dia x 0.315" L). PCB footprint, lead spacing, and mounting hole compatibility must be verified before design implementation.