Littelfuse 0251004.MAT1 PICO® II 251 4A 125VAC/VDC Board Mount Axial Fuse

Part Overview

The Littelfuse 0251004.MAT1 is a 4A 125VAC/VDC board mount axial fuse from the PICO® II 251 series, designed for through-hole mounting applications. This part is currently obsolete, which necessitates identification of active equivalent alternatives that maintain identical electrical and mechanical specifications. All substitute parts listed maintain full parametric equivalence with the original design.

Key Parameters

Parameter	Specification
Current Rating	4 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
Melting I²t	2.45
DC Cold Resistance	0.0204 Ohms
Operating Temperature Range	-55°C ~ 125°C
Approval Agencies	CCC, CSA, cURus, PSE, TUV

Substitute Part Grouping Explanation

All substitute parts for the 0251004.MAT1 maintain identical electrical and mechanical parameters across the following critical specifications:

Current Rating: 4 A
Voltage Rating: 125 V AC / 125 V DC
Response Time: Fast Blow
Mounting Type: Through Hole
Physical Dimensions: 0.110" Dia x 0.280" L (2.80mm x 7.11mm)
Breaking Capacity: 50A AC, 300A DC
Melting I²t: 2.45
DC Cold Resistance: 0.0204 Ohms
Operating Temperature: -55°C ~ 125°C
Approval Agencies: CCC, CSA, cURus, PSE, TUV

Substitutes differ only in packaging format (Cut Tape, Tape & Box) and product status (Active vs. Obsolete). All variants are from the same PICO® II 251 series and are electrically and mechanically interchangeable.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating	Voltage (AC/DC)	Response Time	Mounting	Package	Dimensions	Breaking Capacity	I²t	Resistance	Temperature Range	Status	Inventory
0251004.MAT1	Littelfuse Inc.	PICO® II 251	4 A	125V / 125V	Fast Blow	Through Hole	Axial	0.110" x 0.280"	50A AC, 300A DC	2.45	0.0204 Ω	-55°C ~ 125°C	Obsolete	752 Pcs
0251004.MAT1L	Littelfuse Inc.	PICO® II 251	4 A	125V / 125V	Fast Blow	Through Hole	Cut Tape (CT)	0.110" x 0.280"	50A AC, 300A DC	2.45	0.0204 Ω	-55°C ~ 125°C	Active	2305 Pcs
0251004.HAT1L	Littelfuse Inc.	PICO® II 251	4 A	125V / 125V	Fast Blow	Through Hole	Cut Tape (CT)	0.110" x 0.280"	50A AC, 300A DC	2.45	0.0204 Ω	-55°C ~ 125°C	Active	752 Pcs
0251004.NAT1L	Littelfuse Inc.	PICO® II 251	4 A	125V / 125V	Fast Blow	Through Hole	Cut Tape (CT)	0.110" x 0.280"	50A AC, 300A DC	2.45	0.0204 Ω	-55°C ~ 125°C	Active	5839 Pcs
0251004.NAT6L	Littelfuse Inc.	PICO® II 251	4 A	125V / 125V	Fast Blow	Through Hole	Tape & Box (TB)	0.110" x 0.280"	50A AC, 300A DC	2.45	0.0204 Ω	-55°C ~ 125°C	Active	747 Pcs
0251004.PAT1L	Littelfuse Inc.	PICO® II 251	4 A	125V / 125V	Fast Blow	Through Hole	Tape & Box (TB)	0.110" x 0.280"	50A AC, 300A DC	2.45	0.0204 Ω	-55°C ~ 125°C	Active	779 Pcs

Engineering Selection Recommendations

All listed substitute parts are electrically and mechanically identical to the original 0251004.MAT1. Selection should be based on the following criteria:

Product Status: The original part is obsolete. All substitute parts (0251004.MAT1L, 0251004.HAT1L, 0251004.NAT1L, 0251004.NAT6L, 0251004.PAT1L) are active and available for procurement.

RoHS Compliance: The original 0251004.MAT1 is RoHS non-compliant. All substitute parts are ROHS3 compliant, meeting current environmental regulations.

Packaging Format: Selection between Cut Tape (CT) and Tape & Box (TB) packaging depends on assembly line requirements and volume needs. Cut Tape variants (0251004.MAT1L, 0251004.HAT1L, 0251004.NAT1L) are suitable for automated pick-and-place operations. Tape & Box variants (0251004.NAT6L, 0251004.PAT1L) provide bulk packaging for manual assembly or lower-volume applications.

Regulatory Compliance: All substitute parts maintain identical approval agency certifications (CCC, CSA, cURus, PSE, TUV) and ECCN/HTSUS classifications as the original part.

Frequently Asked Questions (FAQ)

Q: Are all substitute parts electrically identical to the original 0251004.MAT1?

A: Yes. All substitute parts maintain identical current rating (4A), voltage rating (125V AC/DC), response time (Fast Blow), breaking capacity (50A AC, 300A DC), melting I²t (2.45), and DC cold resistance (0.0204 Ohms). They are direct electrical equivalents.

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

A: Cut Tape (CT) packaging is optimized for automated assembly equipment and high-volume production. Tape & Box (TB) packaging provides bulk quantities in a box format, suitable for manual assembly or lower-volume applications. Both formats contain identical components.

Q: Why is the original part obsolete?

A: The 0251004.MAT1 is marked obsolete by the manufacturer. All active substitute parts from the PICO® II 251 series provide identical functionality and are recommended for new designs and replacement applications.

Q: Do the substitute parts meet current RoHS requirements?

A: Yes. All substitute parts are ROHS3 compliant, whereas the original 0251004.MAT1 is RoHS non-compliant. This makes the substitutes suitable for applications requiring environmental compliance.

Q: Can I use these parts interchangeably in my circuit design?

A: Yes. All substitute parts are mechanically and electrically interchangeable with the original 0251004.MAT1. Physical dimensions, mounting type, and electrical characteristics are identical across all variants.

Q: Which substitute part should I select for new designs?

A: For new designs, select based on your assembly process: 0251004.MAT1L, 0251004.HAT1L, or 0251004.NAT1L for automated assembly (Cut Tape), or 0251004.NAT6L or 0251004.PAT1L for manual assembly or bulk applications (Tape & Box). All are active and fully compliant with current standards.

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