Littelfuse 0251003.MAT1 Board Mount Axial Fuse 3A 125VAC/VDC

Part Overview

The Littelfuse 0251003.MAT1 is a 3A 125VAC/125VDC board mount axial 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 maintains fast-blow response characteristics with a 50A AC and 300A DC breaking capacity, suitable for general circuit protection applications in industrial and commercial equipment.

Key Parameters

Parameter	Value
Current Rating	3 A
Voltage Rating AC	125 V
Voltage Rating DC	125 V
Response Time	Fast Blow
Mounting Type	Through Hole
Fuse Type	Board Mount (Cartridge Style Excluded)
Package / Case	Axial
Size / Dimension	0.110" Dia x 0.280" L (2.80mm x 7.11mm)
Breaking Capacity @ Rated Voltage	50A AC, 300A DC
DC Cold Resistance	0.0295 Ohms
Melting I²t	1.19
Operating Temperature Range	-55°C ~ 125°C
Approval Agency	CCC, CSA, cURus, PSE, TUV

Substitute Part Grouping Explanation

Substitution for the 0251003.MAT1 is determined by strict equivalence across the following electrical and mechanical parameters:

Current Rating: 3 A (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)
Fuse Type: Board Mount, Axial configuration (exact match required)
Physical Dimensions: 0.110" Dia x 0.280" L (exact match required)
DC Cold Resistance: 0.0295 Ohms (exact match required)
Melting I²t: 1.19 (exact match required)
Series: PICO® II 251 (exact match required)

All substitute parts listed below meet these criteria. Differences exist only in packaging format (Cut Tape vs. Tape & Box) and product status (Active vs. Obsolete), with no impact on electrical or mechanical performance.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage AC/DC	Response Time	Mounting Type	Package	Product Status	RoHS Status	Inventory (Pcs)
0251003.MAT1	Littelfuse Inc.	3 A	125V / 125V	Fast Blow	Through Hole	Axial	Obsolete	RoHS non-compliant	802
0251003.MAT1L	Littelfuse Inc.	3 A	125V / 125V	Fast Blow	Through Hole	Cut Tape (CT)	Active	ROHS3 Compliant	3818
0251003.HAT1L	Littelfuse Inc.	3 A	125V / 125V	Fast Blow	Through Hole	Cut Tape (CT)	Active	ROHS3 Compliant	1110
0251003.NAT1L	Littelfuse Inc.	3 A	125V / 125V	Fast Blow	Through Hole	Cut Tape (CT)	Active	ROHS3 Compliant	5058
0251003.NAT6L	Littelfuse Inc.	3 A	125V / 125V	Fast Blow	Through Hole	Tape & Box (TB)	Active	ROHS3 Compliant	957
0251003.NF030L	Littelfuse Inc.	3 A	125V / 125V	Fast Blow	Through Hole	Tape & Box (TB)	Active	ROHS3 Compliant	1100
0251003.PAT1L	Littelfuse Inc.	3 A	125V / 125V	Fast Blow	Through Hole	Tape & Box (TB)	Active	ROHS3 Compliant	702

Engineering Selection Recommendations

The 0251003.MAT1 is obsolete and should be replaced with an active equivalent from the PICO® II 251 series. All listed substitutes maintain identical electrical and mechanical specifications.

For new designs and production: 0251003.MAT1L is the direct successor with Cut Tape packaging and ROHS3 compliance. This part offers the highest inventory availability (3818 pcs) and active product status.

For applications requiring Tape & Box packaging: 0251003.NAT6L, 0251003.NF030L, or 0251003.PAT1L are suitable alternatives with equivalent electrical performance and ROHS3 compliance.

All substitute parts carry the same regulatory approvals (CCC, CSA, cURus, PSE, TUV) and maintain the -55°C to 125°C operating temperature range of the original component.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts interchangeably with the 0251003.MAT1?

A: Yes. All listed substitutes are parametrically equivalent across all electrical and mechanical specifications. Differences in packaging format (Cut Tape vs. Tape & Box) do not affect circuit performance or board-level compatibility.

Q: What is the difference between Cut Tape and Tape & Box packaging?

A: Cut Tape (CT) packaging provides individual components on carrier tape, suitable for automated pick-and-place assembly. Tape & Box (TB) packaging includes the same components on tape but supplied in a box for manual handling or lower-volume applications. Electrical and mechanical performance is identical.

Q: Why is the original 0251003.MAT1 marked as obsolete?

A: Obsolescence indicates the manufacturer has discontinued production. Active equivalents with improved compliance (ROHS3) are available as direct replacements.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All active substitute parts (0251003.MAT1L, 0251003.HAT1L, 0251003.NAT1L, 0251003.NAT6L, 0251003.NF030L, 0251003.PAT1L) are ROHS3 compliant. The original 0251003.MAT1 is RoHS non-compliant.

Q: Which substitute should I select for new production?

A: 0251003.MAT1L is the recommended primary choice due to highest inventory availability and active status. Alternative selections depend on packaging requirements and supply chain considerations.

Q: Do all parts carry the same regulatory certifications?

A: Yes. All parts in this equivalence group carry identical approvals: CCC, CSA, cURus, PSE, and TUV.

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