Littelfuse 0251.375MAT1 375mA 125V Axial Board Mount Fuse

Part Overview

The Littelfuse 0251.375MAT1 is a 375mA, 125V AC/DC axial board mount fuse from the PICO® II 251 series. This component is classified as obsolete, which necessitates identification of active equivalent alternatives for new designs and ongoing production requirements. The part features fast-blow response characteristics and is approved by CSA and cURus agencies. Direct substitutes with identical electrical and mechanical parameters are available in active product status with improved compliance profiles.

Substiute Parts

0251.375MAT1

Littelfuse Inc.In Stock: 8150251.375MAT1 Datasheet

Current PartRFQ

0251.375MAT1L

LittelfuseIn Stock: 12900251.375MAT1L Datasheet

DirectRFQ

0251.375HAT1L

Littelfuse Inc.In Stock: 11140251.375HAT1L Datasheet

Parametric EquivalentRFQ

0251.375NAT1L

Littelfuse Inc.In Stock: 9650251.375NAT1L Datasheet

Parametric EquivalentRFQ

0251.375PAT1L

Littelfuse Inc.In Stock: 9690251.375PAT1L Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 0251.375MAT1 is determined by strict equivalence across the following critical parameters:

• Current Rating: 375 mA (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Axial (exact match required)
• Physical Dimensions: 0.110" Dia x 0.280" L (exact match required)
• Breaking Capacity: 50A AC, 300A DC (exact match required)
• DC Cold Resistance: 0.395 Ohms (exact match required)
• Melting I²t: 0.0296 (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Approval Agencies: CSA, cURus (exact match required)

All substitute parts listed below meet these criteria identically. Differences exist only in packaging format and product status (active vs. obsolete) and RoHS compliance level.

Parameter Comparison

Engineering Selection Recommendations

The 0251.375MAT1 is obsolete and should be replaced in new designs and production. All four substitute parts—0251.375MAT1L, 0251.375HAT1L, 0251.375NAT1L, and 0251.375PAT1L—are electrically and mechanically identical and carry active product status.

Selection among the active substitutes is determined by packaging requirements:

• 0251.375MAT1L: Cut Tape (CT) packaging. Suitable for automated assembly processes requiring tape-and-reel format.
• 0251.375HAT1L: Cut Tape (CT) packaging. Suitable for automated assembly processes requiring tape-and-reel format.
• 0251.375NAT1L: Tape & Box (TB) packaging. Suitable for manual assembly or applications requiring boxed component format.
• 0251.375PAT1L: Tape & Box (TB) packaging. Suitable for manual assembly or applications requiring boxed component format.

All substitute parts are ROHS3 compliant and REACH unaffected, providing improved regulatory compliance compared to the obsolete original part. All maintain CSA and cURus approvals.

Frequently Asked Questions (FAQ)

Q: Can I use any of the substitute parts interchangeably with the 0251.375MAT1?

A: Yes. All four substitute parts (0251.375MAT1L, 0251.375HAT1L, 0251.375NAT1L, 0251.375PAT1L) are electrically and mechanically identical to the original part. They differ only in packaging format and product status. Selection should be based on your assembly process requirements (tape-and-reel vs. boxed format).

Q: What is the difference between Cut Tape (CT) and Tape & Box (TB) packaging?

A: Cut Tape (CT) packaging supplies components on continuous tape suitable for automated pick-and-place assembly equipment. Tape & Box (TB) packaging supplies components on tape within a protective box, suitable for manual assembly or lower-volume applications. Both formats contain the identical component.

Q: Why is the original 0251.375MAT1 marked as obsolete?

A: The original part is obsolete due to product lifecycle management. Active equivalents with identical electrical and mechanical specifications are available and should be used for all new designs and production orders.

Q: Are the substitute parts RoHS compliant?

A: Yes. All substitute parts (0251.375MAT1L, 0251.375HAT1L, 0251.375NAT1L, 0251.375PAT1L) are ROHS3 compliant, whereas the original 0251.375MAT1 is RoHS non-compliant. This represents an improvement in regulatory compliance.

Q: Do all substitute parts carry the same approvals as the original?

A: Yes. All substitute parts maintain CSA and cURus approvals identical to the original 0251.375MAT1.

Q: Can I mix packaging formats in a single production run?

A: Yes. Since all substitute parts are electrically and mechanically identical, they can be used interchangeably. However, mixing packaging formats may require different handling procedures in your assembly process.