Littelfuse 0251001.MAT1 PICO® II 251 Board Mount Axial Fuse 1A 125VAC/VDC

Part Overview

The Littelfuse 0251001.MAT1 is a 1A 125VAC/VDC board mount axial fuse from the PICO® II 251 series, designed for through-hole mounting applications. This part is classified as obsolete. Substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements. All substitute parts maintain identical electrical and mechanical specifications while offering active product status and improved compliance certifications.

Key Parameters

Parameter	Value
Current Rating	1 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	0.256
DC Cold Resistance	0.128 Ohms
Operating Temperature Range	-55°C ~ 125°C
Approval Agency	CCC, CSA, cURus, PSE, TUV

Substitute Part Grouping Explanation

Substitute parts for the 0251001.MAT1 are qualified based on strict parametric equivalence. All substitute parts maintain the following critical parameters:

Current Rating: 1 A
Voltage Rating: 125 V AC / 125 V DC
Response Time: Fast Blow
Mounting Type: Through Hole
Package / Case: Axial
Physical Dimensions: 0.110" Dia x 0.280" L (2.80mm x 7.11mm)
Breaking Capacity: 50A AC, 300A DC
Melting I²t: 0.256
DC Cold Resistance: 0.128 Ohms
Operating Temperature: -55°C ~ 125°C
Approval Agencies: CCC, CSA, cURus, PSE, TUV

Substitutes differ only in packaging format (Cut Tape or Tape & Box) and product status (all substitutes are Active). The electrical and mechanical performance characteristics are identical across all qualified alternatives.

Parameter Comparison

Part Number	Manufacturer	Packaging	Product Status	Current Rating	Voltage (AC/DC)	Response Time	Breaking Capacity	Melting I²t	DC Cold Resistance	RoHS Status	Inventory (Pcs)
0251001.MAT1	Littelfuse Inc.	-	Obsolete	1 A	125V / 125V	Fast Blow	50A AC, 300A DC	0.256	0.128 Ω	RoHS non-compliant	747
0251001.MAT1L	Littelfuse Inc.	Cut Tape (CT)	Active	1 A	125V / 125V	Fast Blow	50A AC, 300A DC	0.256	0.128 Ω	ROHS3 Compliant	13734
0251001.HAT1L	Littelfuse Inc.	Cut Tape (CT)	Active	1 A	125V / 125V	Fast Blow	50A AC, 300A DC	0.256	0.128 Ω	ROHS3 Compliant	1199
0251001.NAT1L	Littelfuse	Cut Tape (CT)	Active	1 A	125V / 125V	Fast Blow	50A AC, 300A DC	0.256	0.128 Ω	ROHS3 Compliant	6157
0251001.NAT6L	Littelfuse	Tape & Box (TB)	Active	1 A	125V / 125V	Fast Blow	50A AC, 300A DC	0.256	0.128 Ω	ROHS3 Compliant	1061
0251001.PAT1L	Littelfuse Inc.	Cut Tape (CT)	Active	1 A	125V / 125V	Fast Blow	50A AC, 300A DC	0.256	0.128 Ω	ROHS3 Compliant	6084
0251001.PF001L	Littelfuse Inc.	Tape & Box (TB)	Active	1 A	125V / 125V	Fast Blow	50A AC, 300A DC	0.256	0.128 Ω	ROHS3 Compliant	1080
0251001.PF002L	Littelfuse Inc.	Tape & Box (TB)	Active	1 A	125V / 125V	Fast Blow	50A AC, 300A DC	0.256	0.128 Ω	ROHS3 Compliant	1103
0251001.PF003L	Littelfuse Inc.	Tape & Box (TB)	Active	1 A	125V / 125V	Fast Blow	50A AC, 300A DC	0.256	0.128 Ω	ROHS3 Compliant	649
0251001.PF006L	Littelfuse Inc.	Tape & Box (TB)	Active	1 A	125V / 125V	Fast Blow	50A AC, 300A DC	0.256	0.128 Ω	ROHS3 Compliant	801
0251001.PF008L	Littelfuse Inc.	Tape & Box (TB)	Active	1 A	125V / 125V	Fast Blow	50A AC, 300A DC	0.256	0.128 Ω	ROHS3 Compliant	1006

Engineering Selection Recommendations

All listed substitute parts are direct parametric equivalents to the 0251001.MAT1 and are suitable for replacement in applications requiring 1A 125VAC/VDC board mount axial fuses. Selection between substitutes should be based on the following criteria:

Product Status: All substitute parts carry Active product status, ensuring long-term availability and continued manufacturer support, unlike the obsolete 0251001.MAT1.

RoHS Compliance: All substitute parts are ROHS3 compliant, meeting current environmental and regulatory requirements. The original 0251001.MAT1 is RoHS non-compliant.

Packaging Format: Choose based on assembly requirements. Cut Tape (CT) packaging is suitable for automated pick-and-place assembly. Tape & Box (TB) packaging is appropriate for manual assembly or lower-volume applications.

Inventory Availability: 0251001.MAT1L offers the highest inventory level (13,734 pcs), providing optimal supply chain security for high-volume production.

Regulatory Certifications: All parts maintain identical approval agency certifications (CCC, CSA, cURus, PSE, TUV), ensuring compliance with international safety standards.

Frequently Asked Questions (FAQ)

Q: Can 0251001.MAT1L be used as a direct replacement for 0251001.MAT1?

A: Yes. The 0251001.MAT1L is a direct substitute with identical electrical and mechanical specifications. The primary difference is packaging format (Cut Tape vs. unspecified) and active product status. Both parts are electrically and mechanically interchangeable.

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

A: Cut Tape packaging is supplied on continuous tape suitable for automated assembly equipment. Tape & Box packaging includes the same tape format but is boxed for manual handling and lower-volume applications. Electrical and mechanical performance are identical.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification. The original 0251001.MAT1 is RoHS non-compliant and should be replaced with a compliant alternative for new designs.

Q: Do all substitute parts have the same breaking capacity?

A: Yes. All substitute parts maintain the same breaking capacity of 50A AC and 300A DC at rated voltage, identical to the original 0251001.MAT1.

Q: Which substitute part should I select for high-volume automated assembly?

A: For automated assembly, select a Cut Tape (CT) packaged part such as 0251001.MAT1L, 0251001.HAT1L, 0251001.NAT1L, or 0251001.PAT1L. The 0251001.MAT1L offers the highest inventory availability.

Q: Are there any differences in operating temperature range between substitute parts?

A: No. All substitute parts operate across the identical temperature range of -55°C to 125°C.

Q: Can I mix different substitute part numbers in the same assembly?

A: Yes. All substitute parts are parametrically equivalent and can be used interchangeably within the same circuit or assembly without functional impact.

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