Littelfuse 0263003.M Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0263003.M is a 3A 250VAC board mount fuse in axial package configuration, designed for through-hole PCB mounting applications. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing production support and design updates. The substitute part maintains identical electrical and mechanical specifications while offering improved compliance status and current inventory availability.

Substiute Parts

0263003.M

Littelfuse Inc.In Stock: 9780263003.M Datasheet

Current PartRFQ

0263003.MXL

LittelfuseIn Stock: 12850263003.MXL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse 0263003.MXL qualifies as a direct substitute based on the following criteria:

Electrical Parameters Match:

• Current Rating: 3 A (identical)
• Voltage Rating: 250 V AC (identical)
• Response Time: Fast Blow (identical)
• Breaking Capacity: 50 A (identical)
• Melting I²t: 1.77 (identical)
• DC Cold Resistance: 0.0274 Ohms (identical)

Mechanical Parameters Match:

• Mounting Type: Through Hole (identical)
• Package / Case: Axial (identical)
• Size / Dimension: 0.155" Dia x 0.280" L (identical)
• Operating Temperature Range: -55°C to 125°C (identical)

Certification Match:

• Approval Agencies: CSA, PSE, UR (identical)

The substitution is valid because all critical electrical, mechanical, and certification parameters are identical between the main part and substitute.

Parameter Comparison

Engineering Selection Recommendations

The 0263003.MXL is the appropriate selection for new designs and production transitions from the obsolete 0263003.M. Both parts are electrically and mechanically identical, ensuring drop-in compatibility in existing PCB layouts and circuit designs.

The 0263003.MXL offers the following advantages:

• Active product status ensures long-term availability and supply chain continuity
• ROHS3 compliance status provides regulatory alignment for markets with RoHS requirements
• Higher current inventory (1219 Pcs vs. 931 Pcs) supports production scheduling
• Bulk packaging option available for manufacturing operations

For applications where RoHS compliance is not a requirement, the 0263003.M remains functionally equivalent. However, transition to the 0263003.MXL is recommended to eliminate obsolescence risk.

Frequently Asked Questions (FAQ)

Q: Can the 0263003.MXL be used as a direct replacement for the 0263003.M in existing designs?

A: Yes. The 0263003.MXL is a direct substitute. All electrical parameters (3A current rating, 250V AC voltage rating, fast blow response, 50A breaking capacity, 1.77 melting I²t), mechanical specifications (through-hole axial package, 0.155" Dia x 0.280" L dimensions), and certifications (CSA, PSE, UR) are identical. No circuit modifications or PCB layout changes are required.

Q: What is the difference between the 0263003.M and 0263003.MXL?

A: The primary differences are product status and RoHS compliance. The 0263003.M is obsolete and RoHS non-compliant, while the 0263003.MXL is an active product with ROHS3 compliance. Electrically and mechanically, both parts are identical.

Q: Are there packaging differences between these parts?

A: The 0263003.M packaging designation is not specified in the data. The 0263003.MXL is available in bulk packaging. Both parts use the same axial through-hole package configuration and are compatible with standard PCB assembly processes.

Q: What certifications apply to both parts?

A: Both the 0263003.M and 0263003.MXL carry CSA, PSE, and UR approvals, confirming compliance with North American, Japanese, and international safety standards for board mount fuses.

Q: Is the 0263003.MXL suitable for high-temperature applications?

A: Both parts operate across the -55°C to 125°C temperature range, supporting standard industrial and consumer electronics applications within this thermal envelope.