Littelfuse 025101.5MAT1 Equivalent & Substitute Parts

Part Overview

The Littelfuse 025101.5MAT1 is a 1.5 A, 125 V AC/DC board mount axial fuse from the PICO® II 251 series, designed for through-hole applications. This part is currently obsolete, making equivalent substitute parts necessary for ongoing production and maintenance requirements. The substitute parts listed maintain identical electrical and mechanical specifications while offering improved availability and compliance status.

Key Parameters

Parameter	Specification
Current Rating	1.5 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	0.587
DC Cold Resistance	0.0823 Ohms
Operating Temperature Range	-55°C ~ 125°C
Approval Agencies	CSA, cURus, PSE, TUV

Substitute Part Grouping Explanation

Substitute parts for the 025101.5MAT1 are qualified based on strict electrical and mechanical parameter equivalence. All substitute parts maintain identical specifications across the following critical parameters:

Current Rating: 1.5 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: 0.587
DC Cold Resistance: 0.0823 Ohms
Operating Temperature Range: -55°C ~ 125°C
Approval Agencies: CSA, cURus, PSE, TUV

Substitutes differ only in packaging format (Cut Tape or Tape & Box) and product status (Active vs. Obsolete), with no impact on electrical or mechanical performance.

Parameter Comparison

Part Number	Manufacturer	Product Status	Packaging	Current Rating	Voltage (AC/DC)	Response Time	RoHS Status	Inventory (Pcs)
025101.5MAT1	Littelfuse Inc.	Obsolete	Bulk	1.5 A	125 V / 125 V	Fast Blow	Non-compliant	856
025101.5MAT1L	Littelfuse Inc.	Active	Cut Tape (CT)	1.5 A	125 V / 125 V	Fast Blow	ROHS3 Compliant	4315
025101.5HAT1L	Littelfuse	Active	Cut Tape (CT)	1.5 A	125 V / 125 V	Fast Blow	ROHS3 Compliant	1165
025101.5NAT1L	Littelfuse Inc.	Active	Tape & Box (TB)	1.5 A	125 V / 125 V	Fast Blow	ROHS3 Compliant	1003
025101.5NAT6L	Littelfuse Inc.	Active	Tape & Box (TB)	1.5 A	125 V / 125 V	Fast Blow	ROHS3 Compliant	673
025101.5PAT1L	Littelfuse Inc.	Active	Tape & Box (TB)	1.5 A	125 V / 125 V	Fast Blow	ROHS3 Compliant	1136

Engineering Selection Recommendations

All substitute parts are direct electrical and mechanical equivalents to the 025101.5MAT1. Selection should be based on the following factors:

Product Status: The original 025101.5MAT1 is obsolete. All listed substitutes (025101.5MAT1L, 025101.5HAT1L, 025101.5NAT1L, 025101.5NAT6L, 025101.5PAT1L) are active products with confirmed ongoing availability.

Compliance: The original part is RoHS non-compliant. All substitute parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for new designs and production.

Packaging Considerations: Substitute parts are available in two packaging formats. Cut Tape (CT) packaging is suitable for automated assembly processes. Tape & Box (TB) packaging is appropriate for manual assembly or lower-volume applications.

Inventory Availability: 025101.5MAT1L offers the highest inventory level (4315 pcs), followed by 025101.5PAT1L (1136 pcs) and 025101.5NAT1L (1003 pcs), providing flexibility for procurement planning.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts interchangeably with the 025101.5MAT1?

A: Yes. All substitute parts maintain identical electrical specifications (1.5 A, 125 V AC/DC, Fast Blow response), mechanical dimensions (0.110" Dia x 0.280" L), and performance characteristics (50A AC / 300A DC breaking capacity, 0.587 Melting I²t). Substitution is based on packaging format and availability only.

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

A: Cut Tape packaging is optimized for automated pick-and-place assembly equipment. Tape & Box packaging includes a protective box and is suitable for manual assembly, kit assembly, or applications where individual component handling is required. Both formats contain identical components.

Q: Why is the original 025101.5MAT1 marked as obsolete?

A: The original part has been superseded by active alternatives with improved compliance status. The 025101.5MAT1L variant (with "L" suffix) represents the current production equivalent and is recommended for new designs.

Q: Are all substitute parts certified by the same approval agencies?

A: Yes. All parts listed maintain certification from CSA, cURus, PSE, and TUV, ensuring compliance with international safety and performance standards.

Q: What is the significance of the "L" suffix in part numbers like 025101.5MAT1L?

A: The "L" suffix indicates ROHS3 compliance and represents the current generation of these components. Parts without the "L" suffix are either obsolete or non-compliant with current environmental regulations.

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