Littelfuse 0251007.NRT1JL Equivalent & Substitute Parts

Part Overview

The Littelfuse 0251007.NRT1JL is a 7 A, 125 V AC/DC board mount axial fuse from the PICO® II 251 series. This through-hole component is designed for circuit protection in applications requiring fast-blow response characteristics. The part is currently active in production and widely stocked. Substitute parts are identified to provide packaging flexibility and inventory alternatives while maintaining identical electrical and mechanical performance specifications.

Key Parameters

Parameter	Specification
Current Rating	7 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)
DC Cold Resistance	0.0107 Ohms
Melting I²t	10.4
Operating Temperature Range	-55°C ~ 125°C
Approval Agencies	CSA, cURus, TUV
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 0251007.NRT1JL is determined by equivalence across the following critical parameters:

Current Rating: 7 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)
DC Cold Resistance: 0.0107 Ohms
Melting I²t: 10.4
Operating Temperature Range: -55°C ~ 125°C
Regulatory Compliance: CSA, cURus, TUV certification
RoHS Status: ROHS3 Compliant

All substitute parts listed maintain identical electrical performance and mechanical compatibility. The primary difference between the main part and substitutes is packaging format: the 0251007.NRT1JL is supplied in Tape & Reel (TR) format, while substitute parts are available in Cut Tape (CT) packaging. This distinction affects procurement and assembly processes but does not alter component functionality or performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage (AC/DC)	Response Time	Packaging	Inventory (Pcs)	Breaking Capacity @ Rated Voltage	DC Cold Resistance	Melting I²t
0251007.NRT1JL	Littelfuse Inc.	7 A	125 V / 125 V	Fast Blow	Tape & Reel (TR)	1046	50A	0.0107 Ω	10.4
0251007.HAT1L	Littelfuse Inc.	7 A	125 V / 125 V	Fast Blow	Cut Tape (CT)	1012	50A AC, 300A DC	0.0107 Ω	10.4
0251007.MAT1L	Littelfuse Inc.	7 A	125 V / 125 V	Fast Blow	Cut Tape (CT)	2612	50A AC, 300A DC	0.0107 Ω	10.4
0251007.MRT1L	Littelfuse Inc.	7 A	125 V / 125 V	Fast Blow	Cut Tape (CT)	2400	50A AC, 300A DC	0.0107 Ω	10.4
0251007.NRT1L	Littelfuse Inc.	7 A	125 V / 125 V	Fast Blow	Cut Tape (CT)	175060	50A AC, 300A DC	0.0107 Ω	10.4

Engineering Selection Recommendations

All listed substitute parts are manufactured by Littelfuse Inc. and maintain active product status. Each part carries identical regulatory certifications (CSA, cURus, TUV) and meets ROHS3 compliance requirements. Selection between the main part and substitutes should be based on packaging requirements and inventory availability:

0251007.NRT1JL (Tape & Reel): Suitable for high-volume automated assembly processes requiring continuous reel feeding.
0251007.NRT1L (Cut Tape): Highest inventory availability (175,060 pcs) for applications requiring flexible procurement quantities.
0251007.MAT1L (Cut Tape): Secondary high-inventory option (2,612 pcs) for standard component selection.
0251007.MRT1L (Cut Tape): Alternative inventory source (2,400 pcs) for supply chain diversification.
0251007.HAT1L (Cut Tape): Lower inventory availability (1,012 pcs) suitable for specialized applications.

All parts are electrically and mechanically interchangeable within the specified operating parameters.

Frequently Asked Questions (FAQ)

Q: Can 0251007.NRT1JL be directly replaced with Cut Tape (CT) packaged alternatives?

A: Yes. The electrical and mechanical specifications are identical. The packaging format difference (Tape & Reel vs. Cut Tape) affects only the procurement and assembly method, not component performance or compatibility.

Q: What is the difference between the main part and substitute parts?

A: The 0251007.NRT1JL is supplied in Tape & Reel (TR) packaging, while all substitute parts are supplied in Cut Tape (CT) packaging. Electrical ratings, physical dimensions, response characteristics, and regulatory certifications remain identical across all parts.

Q: Are all substitute parts from the same manufacturer?

A: Yes. All parts listed are manufactured by Littelfuse Inc. and belong to the PICO® II 251 series.

Q: Which substitute part has the highest inventory availability?

A: The 0251007.NRT1L offers the highest inventory level at 175,060 pieces in stock.

Q: Do all parts meet the same regulatory standards?

A: Yes. All parts carry CSA, cURus, and TUV certifications and are ROHS3 compliant.

Q: Can these parts be used interchangeably in the same circuit design?

A: Yes. All parts maintain identical electrical characteristics (7 A, 125 V AC/DC, Fast Blow response) and physical dimensions (0.110" Dia x 0.280" L), ensuring direct functional equivalence in circuit applications.

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