Littelfuse 0251007.NRT1 Equivalent & Substitute Parts

Part Overview

The Littelfuse 0251007.NRT1 is a 7A 125VAC/125VDC board mount axial fuse from the PICO® II 251 series. This component is classified as obsolete, which necessitates identification of active equivalent alternatives for ongoing design support and procurement. All substitute parts maintain identical electrical and mechanical specifications while offering improved product status and compliance certifications.

Key Parameters

Parameter	Specification
Current Rating	7 A
Voltage Rating (AC)	125 V
Voltage Rating (DC)	125 V
Fuse Type	Board Mount (Cartridge Style Excluded)
Response Time	Fast Blow
Package / Case	Axial
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	50A AC, 300A DC
Melting I²t	10.4
Size / Dimension	0.110" Dia x 0.280" L (2.80mm x 7.11mm)
DC Cold Resistance	0.0107 Ohms
Operating Temperature Range	-55°C ~ 125°C
Approval Agency	CSA, cURus, TUV

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across all electrical and mechanical parameters. The following criteria define valid substitutes for the 0251007.NRT1:

Current Rating: 7 A (exact match required)
Voltage Rating: 125 V AC / 125 V DC (exact match required)
Response Time: Fast Blow (exact match required)
Package / Case: Axial (exact match required)
Mounting Type: Through Hole (exact match required)
Size / Dimension: 0.110" Dia x 0.280" L (exact match required)
DC Cold Resistance: 0.0107 Ohms (exact match required)
Melting I²t: 10.4 (exact match required)
Approval Agency: CSA, cURus, TUV (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)

All identified substitute parts meet these criteria. Differences exist only in packaging format (Cut Tape vs. Tape & Reel) and product status (Active vs. Obsolete), with corresponding improvements in RoHS compliance.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage (AC/DC)	Response Time	Package	Mounting	Breaking Capacity	Melting I²t	Size	DC Resistance	Operating Temp	Product Status	RoHS Status	Packaging Format
0251007.NRT1	Littelfuse	7 A	125V / 125V	Fast Blow	Axial	Through Hole	50A AC, 300A DC	10.4	0.110" Dia x 0.280" L	0.0107 Ω	-55°C ~ 125°C	Obsolete	RoHS Non-Compliant	-
0251007.HAT1L	Littelfuse Inc.	7 A	125V / 125V	Fast Blow	Axial	Through Hole	50A AC, 300A DC	10.4	0.110" Dia x 0.280" L	0.0107 Ω	-55°C ~ 125°C	Active	ROHS3 Compliant	Cut Tape (CT)
0251007.MAT1L	Littelfuse Inc.	7 A	125V / 125V	Fast Blow	Axial	Through Hole	50A AC, 300A DC	10.4	0.110" Dia x 0.280" L	0.0107 Ω	-55°C ~ 125°C	Active	ROHS3 Compliant	Cut Tape (CT)
0251007.MRT1L	Littelfuse Inc.	7 A	125V / 125V	Fast Blow	Axial	Through Hole	50A AC, 300A DC	10.4	0.110" Dia x 0.280" L	0.0107 Ω	-55°C ~ 125°C	Active	ROHS3 Compliant	Cut Tape (CT)
0251007.NRT1JL	Littelfuse Inc.	7 A	125V / 125V	Fast Blow	Axial	Through Hole	50A AC, 300A DC	10.4	0.110" Dia x 0.280" L	0.0107 Ω	-55°C ~ 125°C	Active	ROHS3 Compliant	Tape & Reel (TR)
0251007.NRT1L	Littelfuse Inc.	7 A	125V / 125V	Fast Blow	Axial	Through Hole	50A AC, 300A DC	10.4	0.110" Dia x 0.280" L	0.0107 Ω	-55°C ~ 125°C	Active	ROHS3 Compliant	Cut Tape (CT)
0251007.PARJL	Littelfuse Inc.	7 A	125V / 125V	Fast Blow	Axial	Through Hole	50A AC, 300A DC	10.4	0.110" Dia x 0.280" L	0.0107 Ω	-55°C ~ 125°C	Active	ROHS3 Compliant	Tape & Reel (TR)

Engineering Selection Recommendations

All substitute parts are electrically and mechanically equivalent to the 0251007.NRT1. Selection between active alternatives should be based on the following factors:

Product Status: All substitute parts carry Active product status, ensuring long-term availability and manufacturing support compared to the Obsolete status of the original part.

Compliance: All substitute parts are ROHS3 compliant and REACH unaffected, providing improved environmental and regulatory compliance compared to the RoHS non-compliant original part.

Packaging Format: Selection between Cut Tape (CT) and Tape & Reel (TR) packaging should align with assembly process requirements and procurement volume. Cut Tape variants (0251007.HAT1L, 0251007.MAT1L, 0251007.MRT1L, 0251007.NRT1L) are suitable for lower-volume applications. Tape & Reel variants (0251007.NRT1JL, 0251007.PARJL) are optimized for high-volume automated assembly.

Inventory Availability: 0251007.NRT1L offers the highest inventory level (175,060 pcs), providing maximum procurement flexibility for high-volume requirements.

Frequently Asked Questions (FAQ)

Q: Are all substitute parts electrically identical to the 0251007.NRT1?

A: Yes. All substitute parts maintain identical electrical specifications: 7A current rating, 125VAC/125VDC voltage rating, Fast Blow response time, 10.4 melting I²t, 0.0107 Ohms DC cold resistance, and 50A AC / 300A DC breaking capacity.

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

A: Cut Tape (CT) packaging is supplied in individual strips suitable for manual or semi-automated assembly. Tape & Reel (TR) packaging is supplied on continuous reels optimized for high-speed automated pick-and-place assembly equipment.

Q: Why is the original part marked as Obsolete?

A: The 0251007.NRT1 is classified as Obsolete due to its RoHS non-compliant status. All active substitute parts meet current ROHS3 compliance requirements and are recommended for new designs and ongoing procurement.

Q: Can I use any substitute part interchangeably with the 0251007.NRT1?

A: Yes, all substitute parts are direct functional equivalents. Selection should be based on packaging format requirements (Cut Tape vs. Tape & Reel) and procurement volume needs.

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

A: Yes. All substitute parts carry identical certifications: CSA, cURus, and TUV approval.

Q: What is the operating temperature range for these fuses?

A: All parts, including the original and all substitutes, operate across the temperature range of -55°C to 125°C.

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