Littelfuse 0251010.M Equivalent & Substitute Parts

Part Overview

The Littelfuse 0251010.M is a 10A 125VAC/VDC board mount fuse with fast blow response time, designed for through-hole axial mounting applications. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity. The substitute part 0251010.MXL provides functional equivalence with current product status and improved compliance characteristics.

Substiute Parts

0251010.M

Littelfuse Inc.In Stock: 10130251010.M Datasheet

Current PartRFQ

0251010.MXL

Littelfuse Inc.In Stock: 36940251010.MXL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 0251010.MXL qualifies as a direct substitute for the 0251010.M based on identical electrical and mechanical parameters. Substitution is valid when the following criteria are met:

• Current Rating: 10 A (identical)
• Voltage Rating: 125VAC / 125VDC (identical)
• Response Time: Fast Blow (identical)
• Mounting Type: Through Hole Axial (identical)
• Breaking Capacity: 50A AC, 300A DC (identical)
• Physical Dimensions: 0.110" Dia x 0.280" L (identical)
• DC Cold Resistance: 0.0072 Ohms (identical)
• Melting I²t: 25.5 (identical)
• Approval Certifications: CSA, cURus, TUV (identical)
• Operating Temperature Range: -55°C ~ 125°C (identical)

The primary distinction between these parts is product status and compliance posture, not functional or electrical characteristics.

Parameter Comparison

Engineering Selection Recommendations

The 0251010.MXL is the appropriate selection for new designs and procurement activities. This part maintains full electrical and mechanical equivalence to the 0251010.M while offering two significant advantages:

1. Active Product Status: The 0251010.MXL is actively manufactured and supported by Littelfuse Inc., ensuring long-term availability and supply chain stability compared to the obsolete 0251010.M.

2. Regulatory Compliance: The 0251010.MXL meets ROHS3 compliance requirements, whereas the 0251010.M is non-compliant. For applications subject to RoHS directives or customer compliance mandates, the 0251010.MXL is the required selection.

Both parts carry identical certifications (CSA, cURus, TUV) and are suitable for the same circuit protection applications within the specified voltage and current parameters.

Frequently Asked Questions (FAQ)

Q: Can the 0251010.MXL be used as a direct replacement for the 0251010.M in existing designs?

A: Yes. The 0251010.MXL is electrically and mechanically identical to the 0251010.M. All electrical parameters, physical dimensions, breaking capacity, and thermal characteristics are equivalent. The parts are pin-compatible and require no circuit modifications.

Q: What is the difference between these two part numbers?

A: The primary differences are product status and compliance posture. The 0251010.M is obsolete and RoHS non-compliant. The 0251010.MXL is an active product that meets ROHS3 compliance standards. Functionally, both parts are identical.

Q: Are there packaging differences between 0251010.M and 0251010.MXL?

A: The 0251010.M is supplied in standard packaging, while the 0251010.MXL is supplied in bulk packaging. Both use identical axial through-hole form factors with the same physical dimensions (0.110" Dia x 0.280" L).

Q: Which certifications apply to both parts?

A: Both the 0251010.M and 0251010.MXL carry CSA, cURus, and TUV approvals, confirming suitability for safety-critical applications within their rated voltage and current specifications.

Q: What is the melting I²t value, and why is it important?

A: The melting I²t value of 25.5 defines the thermal energy required to melt the fuse element. This parameter is identical for both parts and determines the fuse's response to overcurrent conditions. It is critical for circuit protection coordination.