Littelfuse 0255.375M Equivalent & Substitute Parts

Part Overview

The Littelfuse 0255.375M is a 375 mA, 125 V AC/DC board mount axial fuse from the PICO® 255 series. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The PICO® 255 series has been superseded by newer product lines with enhanced performance characteristics and improved compliance standards.

Substiute Parts

0255.375M

Littelfuse Inc.In Stock: 8920255.375M Datasheet

Current PartRFQ

0251.375MXL

Littelfuse Inc.In Stock: 18530251.375MXL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 0255.375M is determined by strict equivalence across the following electrical and mechanical parameters:

• Current Rating: 375 mA (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)
• Package / Case: Axial (exact match required)
• Breaking Capacity: 50 A AC, 300 A DC (exact match required)

The Littelfuse 0251.375MXL meets all substitution criteria as a manufacturer-recommended equivalent. This part maintains identical electrical performance specifications while offering improved product status and compliance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The 0251.375MXL is the manufacturer-recommended substitute for the obsolete 0255.375M. Both parts deliver identical electrical performance across all critical parameters: 375 mA current rating, 125 V AC/DC voltage rating, fast blow response, and 50 A AC / 300 A DC breaking capacity.

The 0251.375MXL offers significant advantages for new designs and production continuity:

• Active product status ensures long-term availability and supply chain stability
• ROHS3 compliance meets current environmental and regulatory requirements
• Enhanced operating temperature range (-55°C ~ 125°C) provides broader application flexibility
• Improved certifications (CSA, cURus) support expanded market applications

Physical dimensions differ slightly: the substitute has a marginally larger diameter (0.110" vs 0.095") while maintaining identical length. PCB layout verification is required to confirm mechanical fit in existing designs.

Frequently Asked Questions (FAQ)

Q: Can the 0251.375MXL be used as a direct replacement for the 0255.375M?

A: Yes. The 0251.375MXL is the manufacturer-recommended equivalent and maintains identical electrical specifications: 375 mA current rating, 125 V AC/DC voltage rating, fast blow response, and breaking capacity. Physical dimensions differ slightly in diameter, requiring PCB layout verification.

Q: What is the primary reason for substitution?

A: The 0255.375M is classified as obsolete. The 0251.375MXL provides equivalent electrical performance with active product status, ensuring continued availability and supply chain reliability.

Q: Are there compliance differences between these parts?

A: Yes. The 0255.375M is RoHS non-compliant, while the 0251.375MXL is ROHS3 compliant. The substitute also carries enhanced certifications (CSA, cURus) compared to the original part (CSA, UL).

Q: Will the 0251.375MXL fit in existing PCB designs?

A: The substitute has a slightly larger diameter (0.110" vs 0.095") while maintaining the same length (0.280"). PCB layout verification is required to confirm mechanical compatibility with existing through-hole footprints.

Q: What is the operating temperature range for each part?

A: The 0255.375M does not specify an operating temperature range. The 0251.375MXL operates across -55°C ~ 125°C, providing broader thermal performance for demanding applications.

Q: Are both parts approved by the same certification agencies?

A: Both parts carry CSA approval. The 0255.375M is also UL-approved, while the 0251.375MXL carries cURus certification. Both certifications meet industry standards for fuse components.