Littelfuse 0275.375M Equivalent & Substitute Parts

Part Overview

The Littelfuse 0275.375M is a 375 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 support and new design implementations. The PICO® 275 series has been superseded by newer product lines offering improved performance characteristics and enhanced compliance certifications.

Substiute Parts

0275.375M

Littelfuse Inc.In Stock: 7480275.375M Datasheet

Current PartRFQ

0251.375MXL

Littelfuse Inc.In Stock: 18530251.375MXL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 0275.375M is determined by strict equivalence across the following critical parameters:

• Current Rating: Must be 375 mA (exact match required)
• Voltage Rating: Must support 125 V AC and 125 V DC minimum
• Fuse Type: Must be board mount axial configuration
• Mounting Type: Must be through hole
• Response Time: Must be fast blow characteristic
• Operating Temperature: Must support -55°C ~ 125°C range

The Littelfuse 0251.375MXL meets all substitution criteria as a direct functional equivalent from the PICO® II 251 series, which represents the active product line replacement for the obsolete PICO® 275 series.

Parameter Comparison

Engineering Selection Recommendations

The 0251.375MXL is the direct substitute for the obsolete 0275.375M. Both components share identical electrical specifications across current rating, voltage ratings, and response characteristics. The substitute part offers the following advantages:

• Active Product Status: The 0251.375MXL is an active product with established supply chain availability, whereas the 0275.375M is obsolete.
• Enhanced Compliance: The substitute achieves ROHS3 compliance, compared to the non-compliant status of the original part. Approval certifications include CSA and cURus in addition to UL.
• Improved Specifications: The 0251.375MXL provides documented breaking capacity (50A AC, 300A DC) and DC cold resistance (0.395 Ohms), parameters not specified for the original part.

Physical dimensions show a minor increase in diameter (0.110" versus 0.093"), while length remains constant at 0.280". This dimensional change must be evaluated against PCB layout constraints in the target application.

Frequently Asked Questions (FAQ)

Q: Can the 0251.375MXL be used as a direct replacement for the 0275.375M in existing designs?

A: Yes, the 0251.375MXL is electrically equivalent across all critical parameters: 375 mA current rating, 125 V AC/DC voltage rating, fast blow response, through hole axial mounting, and identical operating temperature range. Physical dimensions differ slightly in diameter, requiring verification of PCB footprint compatibility.

Q: What is the primary reason for substitution?

A: The 0275.375M is classified as obsolete. The 0251.375MXL represents the active product line equivalent from Littelfuse's PICO® II 251 series, ensuring long-term availability and supply chain continuity.

Q: Are there compliance differences between these parts?

A: Yes. The 0251.375MXL achieves ROHS3 compliance and carries CSA and cURus certifications in addition to UL approval. The 0275.375M is RoHS non-compliant. Applications subject to RoHS or regional compliance requirements must use the substitute part.

Q: Will the larger diameter of the 0251.375MXL affect board layout?

A: The substitute has a diameter of 0.110" compared to 0.093" for the original part. The length remains 0.280". PCB hole spacing and component clearances must be verified to confirm mechanical compatibility in the target application.

Q: What certifications apply to the substitute part?

A: The 0251.375MXL carries CSA, cURus, and UL approvals. The original 0275.375M carries UL approval only.