Littelfuse 0275.750M Equivalent & Substitute Parts

Part Overview

The Littelfuse 0275.750M is a 750 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 The PICO® 275 series has been superseded by newer product lines offering enhanced performance characteristics and improved compliance standards.

Substiute Parts

0275.750M

Littelfuse Inc.In Stock: 10970275.750M Datasheet

Current PartRFQ

0251.750MXL

Littelfuse Inc.In Stock: 7910251.750MXL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse 0251.750MXL qualifies as a direct substitute for the 0275.750M based on the following critical electrical and mechanical parameters:

• Current Rating: Both parts are rated at 750 mA
• Voltage Ratings: Both support 125 V AC and 125 V DC
• Response Characteristic: Both employ fast blow response time
• Mounting Configuration: Both are through hole mounted axial fuses
• Operating Temperature: Both operate across -55°C to 125°C
• Fuse Classification: Both are board mount fuses excluding cartridge style

The 0251.750MXL represents an active product from the PICO® II 251 series, providing a modern alternative to the obsolete 0275.750M while maintaining electrical equivalence across all specified parameters.

Parameter Comparison

Engineering Selection Recommendations

The 0251.750MXL is the manufacturer-recommended substitute for the obsolete 0275.750M. Selection of the 0251.750MXL provides the following advantages:

• Active Product Status: The 0251.750MXL is an active product with established supply chain availability, eliminating obsolescence risk associated with the 0275.750M.
• Enhanced Compliance: The 0251.750MXL achieves ROHS3 compliance, whereas the 0275.750M is non-compliant. This is critical for applications subject to environmental regulations.
• Expanded Certifications: The 0251.750MXL carries CSA, cURus, and TUV approvals in addition to UL certification, providing broader regulatory acceptance across markets.
• Electrical Equivalence: All critical electrical parameters—current rating, voltage ratings, and response time—are identical between the two parts, ensuring functional compatibility in existing circuit designs.
• Mechanical Compatibility: Both parts share identical through hole axial mounting configuration and operating temperature range, supporting direct board-level substitution.

Frequently Asked Questions (FAQ)

Q: Can the 0251.750MXL be used as a direct replacement for the 0275.750M in existing designs?

A: Yes. The 0251.750MXL is electrically and mechanically equivalent to the 0275.750M across all specified parameters: 750 mA current rating, 125 V AC/DC voltage ratings, fast blow response, through hole axial mounting, and -55°C to 125°C operating temperature. The parts are functionally interchangeable at the circuit level.

Q: What is the physical size difference between these parts?

A: The 0275.750M measures 0.093" diameter × 0.280" length (2.36mm × 7.11mm). The 0251.750MXL measures 0.110" diameter × 0.280" length (2.80mm × 7.11mm). The length is identical; the diameter difference is 0.017" (0.44mm). This minor dimensional variation does not affect through hole mounting compatibility on standard PCB layouts.

Q: Why is the 0275.750M classified as obsolete?

A: The 0275.750M belongs to the PICO® 275 series, which has been superseded by the PICO® II 251 series. Littelfuse has transitioned product lines to newer designs offering improved performance and compliance characteristics. The 0251.750MXL represents the active equivalent within the current product portfolio.

Q: Are there compliance differences between these parts?

A: Yes. The 0275.750M is RoHS non-compliant, while the 0251.750MXL is ROHS3 compliant. Additionally, the 0251.750MXL carries CSA, cURus, and TUV certifications alongside UL approval, whereas the 0275.750M carries only UL approval. These differences are significant for applications subject to environmental or regional regulatory requirements.

Q: What is the DC cold resistance specification for the 0251.750MXL?

A: The 0251.750MXL has a DC cold resistance of 0.175 Ohms. This specification is not provided for the 0275.750M in the available data.

Q: Are there any packaging differences?

A: The 0275.750M is specified with packaging designation "-" (not provided). The 0251.750MXL is supplied in bulk packaging. Both parts are through hole axial fuses with identical electrical characteristics.