Littelfuse 025103.5MAT1 Board Mount Axial Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 025103.5MAT1 is a 3.5 A, 125 V AC/DC board mount axial fuse from the PICO® II 251 series, designed for through-hole mounting applications. This part carries an obsolete product status, making identification of equivalent and substitute parts essential for ongoing design support, maintenance, and production continuity. The electrical and mechanical specifications remain consistent across the substitute part family, enabling direct functional replacement based on packaging and compliance requirements.

Key Parameters

Parameter	Value
Current Rating	3.5 A
Voltage Rating (AC)	125 V
Voltage Rating (DC)	125 V
Response Time	Fast Blow
Mounting Type	Through Hole
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	1.58
DC Cold Resistance	0.024 Ohms
Operating Temperature Range	-55°C ~ 125°C
Approval Agencies	CSA, cURus, PSE, TUV

Substitute Part Grouping Explanation

All substitute parts maintain identical electrical and mechanical specifications as the main part 025103.5MAT1. Substitution is determined by the following key parameters:

Current Rating: 3.5 A (all parts)
Voltage Rating: 125 V AC / 125 V DC (all parts)
Response Time: Fast Blow (all parts)
Package / Case: Axial (all parts)
Physical Dimensions: 0.110" Dia x 0.280" L (all parts)
Breaking Capacity: 50A AC, 300A DC (all parts)
Melting I²t: 1.58 (all parts)
DC Cold Resistance: 0.024 Ohms (all parts)
Operating Temperature: -55°C ~ 125°C (all parts)
Approval Agencies: CSA, cURus, PSE, TUV (all parts)

Differences among substitute parts are limited to packaging format (Cut Tape, Tape & Box) and product status (Active vs. Obsolete). These variations do not affect electrical or mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating	Voltage AC/DC	Response Time	Package	Packaging Format	Product Status	RoHS Status	Inventory (Pcs)
025103.5MAT1	Littelfuse Inc.	PICO® II 251	3.5 A	125 V / 125 V	Fast Blow	Axial	Bulk	Obsolete	RoHS non-compliant	751
025103.5MAT1L	Littelfuse Inc.	PICO® II 251	3.5 A	125 V / 125 V	Fast Blow	Axial	Cut Tape (CT)	Active	ROHS3 Compliant	876
025103.5HAT1L	Littelfuse Inc.	PICO® II 251	3.5 A	125 V / 125 V	Fast Blow	Axial	Cut Tape (CT)	Active	ROHS3 Compliant	1004
025103.5NAT1L	Littelfuse Inc.	PICO® II 251	3.5 A	125 V / 125 V	Fast Blow	Axial	Tape & Box (TB)	Active	ROHS3 Compliant	976
025103.5NAT6L	Littelfuse Inc.	PICO® II 251	3.5 A	125 V / 125 V	Fast Blow	Axial	Tape & Box (TB)	Active	ROHS3 Compliant	1092
025103.5PAT1L	Littelfuse Inc.	PICO® II 251	3.5 A	125 V / 125 V	Fast Blow	Axial	Tape & Box (TB)	Active	ROHS3 Compliant	713

Engineering Selection Recommendations

For applications currently using the obsolete 025103.5MAT1, direct substitution is supported by five active equivalent parts, all maintaining identical electrical and mechanical specifications.

Primary Recommendation: 025103.5MAT1L offers the most direct replacement path, maintaining the same part number base with updated packaging (Cut Tape) and active product status. This part is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

Alternative Selections: Parts 025103.5HAT1L, 025103.5NAT1L, 025103.5NAT6L, and 025103.5PAT1L are parametric equivalents with identical electrical performance. Selection among these alternatives depends on packaging format requirements:

Cut Tape (CT) format: 025103.5MAT1L, 025103.5HAT1L
Tape & Box (TB) format: 025103.5NAT1L, 025103.5NAT6L, 025103.5PAT1L

All substitute parts carry Active product status, ROHS3 compliance, and REACH unaffected designation, ensuring long-term supply availability and regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can 025103.5MAT1L be used as a direct replacement for 025103.5MAT1?

A: Yes. Both parts share identical electrical ratings (3.5 A, 125 V AC/DC), response time (Fast Blow), physical dimensions (0.110" Dia x 0.280" L), breaking capacity (50A AC, 300A DC), and operating temperature range (-55°C ~ 125°C). The primary difference is packaging format (bulk vs. Cut Tape) and product status (Obsolete vs. Active). Electrical and mechanical compatibility is complete.

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

A: Cut Tape packaging provides individual component strips suitable for automated pick-and-place assembly. Tape & Box packaging includes the same tape format with protective boxing for storage and handling. Both formats contain identical components with no electrical or mechanical differences. Selection depends on assembly process requirements and inventory management preferences.

Q: Are all substitute parts ROHS3 compliant?

A: The original 025103.5MAT1 is RoHS non-compliant. All five substitute parts (025103.5MAT1L, 025103.5HAT1L, 025103.5NAT1L, 025103.5NAT6L, 025103.5PAT1L) are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Q: Do packaging differences affect electrical performance?

A: No. Packaging format (Cut Tape or Tape & Box) is a logistics and assembly consideration only. All substitute parts maintain identical electrical specifications, breaking capacity, melting I²t, DC cold resistance, and approval certifications regardless of packaging format.

Q: Which substitute part has the highest current inventory?

A: 025103.5NAT6L carries the highest inventory at 1092 pieces, followed by 025103.5HAT1L at 1004 pieces. Both are Active products with full regulatory compliance.

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