Littelfuse 0275.500M Equivalent & Substitute Parts

Part Overview

The Littelfuse 0275.500M is a 500 mA, 125 V AC/DC board mount axial fuse from the PICO® 275 series. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system maintenance and new design implementations. The PICO® 275 series has been superseded by newer product lines that maintain electrical compatibility while offering improved availability and compliance certifications.

Substiute Parts

0275.500M

Littelfuse Inc.In Stock: 9130275.500M Datasheet

Current PartRFQ

0251.500MXL

Littelfuse Inc.In Stock: 35610251.500MXL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The 0251.500MXL from the PICO® II 251 series qualifies as a direct substitute based on the following critical parameters:

• Current Rating: 500 mA (identical)
• Voltage Rating AC: 125 V (identical)
• Voltage Rating DC: 125 V (identical)
• Response Time: Fast Blow (identical)
• Mounting Type: Through Hole (identical)
• Package Type: Axial (identical)
• Operating Temperature Range: -55°C to 125°C (identical)

The 0251.500MXL maintains full electrical and mechanical compatibility with the 0275.500M while offering active product status and enhanced regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

The 0251.500MXL is the recommended substitute for the obsolete 0275.500M based on the following factors:

• Electrical equivalence across all critical parameters (current, voltage, response time)
• Active product status ensuring long-term availability
• Enhanced regulatory compliance with ROHS3 certification and expanded approval agencies (CSA, cURus, TUV in addition to UL)
• Improved breaking capacity specifications (50A AC, 300A DC) and documented melting I²t rating (0.0598)
• Identical operating temperature range and through-hole axial mounting configuration

The minor dimensional increase (0.110" diameter versus 0.093") must be verified for PCB layout compatibility in existing designs, though the axial length remains unchanged at 0.280".

Frequently Asked Questions (FAQ)

Q: Can the 0251.500MXL be used as a direct replacement for the 0275.500M in existing designs?

A: Yes, the 0251.500MXL provides electrical and functional equivalence. The primary consideration is the increased body diameter (0.110" versus 0.093"), which must be confirmed compatible with existing PCB footprints and mounting holes.

Q: What is the difference in RoHS compliance between these parts?

A: The 0275.500M is RoHS non-compliant, while the 0251.500MXL meets ROHS3 standards. For applications requiring RoHS compliance, the 0251.500MXL is the appropriate selection.

Q: Are the approval certifications interchangeable?

A: The 0275.500M carries UL approval. The 0251.500MXL carries broader certifications (CCC, CSA, cURus, TUV). Both meet UL standards, making the 0251.500MXL suitable for applications requiring UL compliance and additional regional certifications.

Q: What does the breaking capacity specification mean?

A: Breaking capacity indicates the maximum current the fuse can safely interrupt without damage. The 0251.500MXL specifies 50A AC and 300A DC breaking capacity, providing documented performance data not listed for the 0275.500M.

Q: Is the operating temperature range identical?

A: Yes, both parts operate across -55°C to 125°C, ensuring thermal compatibility in equivalent applications.