Littelfuse 0275.250M Equivalent & Substitute Parts

Part Overview

The Littelfuse 0275.250M is a 250 mA, 125 V AC/DC board mount axial fuse from the PICO® 275 series. This component is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and component procurement. The PICO® 275 series has been superseded by newer product lines that maintain electrical compatibility while offering improved performance characteristics and current manufacturing support.

Substiute Parts

0275.250M

Littelfuse Inc.In Stock: 11430275.250M Datasheet

Current PartRFQ

0251.250MXL

LittelfuseIn Stock: 10320251.250MXL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 0275.250M is based on strict electrical and mechanical parameter matching:

Primary Substitution Criteria:

• Current rating must be 250 mA
• Voltage ratings must be 125 V AC and 125 V DC minimum
• Mounting type must be Through Hole
• Package configuration must be Axial
• Response time must be Fast Blow
• Operating temperature range must encompass -55°C to 125°C

The Littelfuse 0251.250MXL satisfies all substitution criteria as an active product from the PICO® II 251 series, providing direct electrical and mechanical compatibility with identical current and voltage ratings, mounting configuration, and thermal operating range.

Parameter Comparison

Engineering Selection Recommendations

The 0251.250MXL is the direct substitute for the obsolete 0275.250M. Both components share identical electrical specifications (250 mA, 125 V AC/DC) and mechanical configuration (Through Hole, Axial package). The 0251.250MXL offers the following advantages:

• Active product status with ongoing manufacturer support and availability
• Enhanced regulatory compliance (ROHS3 Compliant vs. RoHS non-compliant)
• Expanded approval certifications (CSA, cURus vs. UL only)
• Improved performance data (Breaking Capacity and Melting I²t specifications provided)

Selection of the 0251.250MXL eliminates obsolescence risk while maintaining full electrical and mechanical compatibility with existing circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the 0251.250MXL be used as a direct replacement for the 0275.250M?

A: Yes. Both components have identical current ratings (250 mA), voltage ratings (125 V AC/DC), mounting type (Through Hole), and package configuration (Axial). Electrical and mechanical compatibility is confirmed.

Q: What is the physical difference between these fuses?

A: The 0275.250M has a diameter of 0.093" (2.36 mm), while the 0251.250MXL has a diameter of 0.110" (2.80 mm). Both share the same length of 0.280" (7.11 mm). The slightly larger diameter of the substitute does not affect board mount compatibility for standard through-hole applications.

Q: Why is the 0275.250M listed as obsolete?

A: The PICO® 275 series has been superseded by the PICO® II 251 series. Littelfuse has transitioned production to the newer series, which provides improved specifications and regulatory compliance.

Q: Are there any compliance differences between the two parts?

A: The 0251.250MXL is ROHS3 Compliant and carries CSA and cURus certifications, while the 0275.250M is RoHS non-compliant with UL approval only. For applications requiring current regulatory compliance, the 0251.250MXL is the appropriate selection.

Q: What is the DC Cold Resistance of the substitute?

A: The 0251.250MXL has a DC Cold Resistance of 0.665 Ohms. This specification is not provided for the 0275.250M.