Littelfuse 0255007.M Equivalent & Substitute Parts

Part Overview

The Littelfuse 0255007.M is a 7A 125VAC/125VDC board mount axial fuse from the PICO® 255 series. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system maintenance and new design implementations. The part is designed for through-hole mounting applications requiring fast-blow response characteristics and dual voltage rating capability.

Substiute Parts

0255007.M

Littelfuse Inc.In Stock: 8760255007.M Datasheet

Current PartRFQ

0251007.MXL

Littelfuse Inc.In Stock: 24460251007.MXL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete 0255007.M is determined by strict equivalence across the following electrical and mechanical parameters:

• Current Rating: 7 A (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (exact match required)
• Response Time: Fast Blow (exact match required)
• Fuse Type: Board Mount, Axial configuration (exact match required)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity: 50 A AC / 300 A DC (exact match required)

The Littelfuse 0251007.MXL from the PICO® II 251 series meets all mandatory electrical and mechanical substitution criteria. Both parts share identical current, voltage, response time, and breaking capacity specifications. Physical dimensions differ slightly (0.110" Dia vs. 0.095" Dia), but both conform to axial through-hole board mount standards. The substitute part is active in production with enhanced compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 0251007.MXL is the direct substitute for the obsolete 0255007.M. Both components deliver identical electrical performance across all critical parameters: 7A current rating, 125V AC/DC voltage rating, fast-blow response, and 50A AC / 300A DC breaking capacity.

The substitute part offers additional advantages in terms of product lifecycle and compliance. The 0251007.MXL maintains active production status, ensuring long-term availability. It carries expanded approval certifications (CSA, cURus, TUV) compared to the original part (CSA, UL) and achieves ROHS3 compliance, whereas the original part is RoHS non-compliant. Operating temperature range is specified for the substitute (-55°C ~ 125°C) versus unspecified for the original.

Physical dimensions show a minor increase in diameter (0.110" vs. 0.095"), while length remains constant at 0.280". This dimensional difference must be verified against PCB footprint specifications to confirm mechanical compatibility in existing designs.

Frequently Asked Questions (FAQ)

Q: Can the 0251007.MXL be used as a direct replacement for the 0255007.M in existing designs?

A: Yes, provided that PCB footprint and mounting hole spacing accommodate the slightly larger diameter (0.110" vs. 0.095"). All electrical parameters are identical. Verify mechanical clearance before implementation.

Q: What is the significance of the different series designations (PICO® 255 vs. PICO® II 251)?

A: The series designation indicates product generation within the Littelfuse portfolio. Both series deliver equivalent electrical performance for this 7A 125V application. The PICO® II 251 represents a newer generation with enhanced compliance certifications and active production status.

Q: Does the RoHS3 compliance of the substitute part affect compatibility?

A: RoHS3 compliance of the substitute part is advantageous for new designs and systems subject to environmental regulations. It does not affect electrical or mechanical compatibility with the original part specification.

Q: Are there any thermal or performance differences between these parts?

A: Both parts share identical current rating, voltage rating, response time, and breaking capacity. Operating temperature range is specified for the substitute (-55°C ~ 125°C) but not provided for the original part. DC cold resistance is specified for the substitute (0.0107 Ohms) but not for the original.

Q: What approvals should be considered when selecting between these parts?

A: The original part carries CSA and UL approvals. The substitute part carries CSA, cURus, and TUV approvals. Selection should align with system certification requirements and regional compliance standards.