Littelfuse 025502.5M Equivalent & Substitute Parts

Part Overview

The Littelfuse 025502.5M is a 2.5 A, 125 V AC/DC board mount axial fuse designed for through-hole applications. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system support and new design implementations. The PICO® 255 series fuse provides fast-blow protection in compact axial packaging with a breaking capacity of 50 A AC and 300 A DC.

Substiute Parts

025502.5M

Littelfuse Inc.In Stock: 866025502.5M Datasheet

Current PartRFQ

025102.5MXL

Littelfuse Inc.In Stock: 1987025102.5MXL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse 025102.5MXL qualifies as a direct substitute for the 025502.5M based on the following critical electrical and mechanical parameters:

Matching Parameters:

• Current Rating: 2.5 A (identical)
• Voltage Rating (AC): 125 V (identical)
• Voltage Rating (DC): 125 V (identical)
• Response Time: Fast Blow (identical)
• Mounting Type: Through Hole (identical)
• Fuse Type: Board Mount (Cartridge Style Excluded) (identical)
• Package / Case: Axial (identical)
• Breaking Capacity (AC): 50 A (identical)
• Breaking Capacity (DC): 300 A (identical)
• Manufacturer: Littelfuse Inc. (same manufacturer)

The 025102.5MXL represents an active product from the PICO® II 251 series, providing functional equivalence with enhanced compliance certifications and improved availability compared to the obsolete 025502.5M.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 025102.5MXL is the manufacturer-recommended substitute for the obsolete 025502.5M. Selection of the 025102.5MXL is based on:

• Electrical Equivalence: All critical electrical parameters (current rating, voltage ratings, breaking capacity, and response time) are identical.
• Mechanical Compatibility: Identical mounting type, fuse type, and axial package configuration ensure direct board-level compatibility.
• Product Status: The 025102.5MXL is an active product with established supply chain availability, whereas the 025502.5M is obsolete.
• Regulatory Compliance: The 025102.5MXL carries expanded approval certifications (CCC, CSA, cURus, PSE, TUV) compared to the 025502.5M (CSA, UL), and achieves ROHS3 compliance.
• Operational Range: The 025102.5MXL specifies an operating temperature range of -55°C to 125°C, providing defined thermal performance parameters.

Frequently Asked Questions (FAQ)

Q: Can the 025102.5MXL be used as a direct replacement for the 025502.5M in existing designs?

A: Yes. The 025102.5MXL provides electrical and mechanical equivalence across all specified parameters. Both components share identical current ratings (2.5 A), voltage ratings (125 V AC/DC), response time (fast blow), mounting configuration (through-hole axial), and breaking capacity (50 A AC, 300 A DC).

Q: What are the physical dimension differences between these parts?

A: The 025502.5M has a diameter of 0.095" (2.41 mm) and length of 0.280" (7.11 mm). The 025102.5MXL has a diameter of 0.110" (2.80 mm) and length of 0.280" (7.11 mm). The length is identical; the diameter difference is 0.015" (0.39 mm).

Q: Are there compliance differences between the two parts?

A: Yes. The 025502.5M is RoHS non-compliant, while the 025102.5MXL is ROHS3 compliant. The 025102.5MXL also carries additional regulatory approvals (CCC, PSE, TUV) beyond those of the 025502.5M.

Q: What is the availability status of each part?

A: The 025502.5M is obsolete. The 025102.5MXL is an active product with established inventory and supply chain support.

Q: Are there electrical performance differences in the substitute?

A: No. Both parts maintain identical electrical specifications for current rating, voltage rating, response time, and breaking capacity. The 025102.5MXL provides additional electrical characterization data (melting I²t: 0.721, DC cold resistance: 0.036 Ohms).