Littelfuse 0251007.NRT2 Equivalent & Substitute Parts

Part Overview

The Littelfuse 0251007.NRT2 is a 7 A, 125 V AC/DC board mount axial fuse from the PICO® II 251 series. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The part features fast-blow response characteristics, CSA/cURus/TUV approvals, and operates across -55°C to 125°C. Substitute parts maintain identical electrical and mechanical specifications while offering active product status and improved compliance profiles.

Key Parameters

Parameter	Value
Current Rating	7 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
Breaking Capacity @ Rated Voltage	50A AC, 300A DC
Melting I²t	10.4
Operating Temperature Range	-55°C ~ 125°C
Size / Dimension	0.110" Dia x 0.280" L (2.80mm x 7.11mm)
DC Cold Resistance	0.0107 Ohms
Approval Agency	CSA, cURus, TUV

Substitute Part Grouping Explanation

Substitute parts for the 0251007.NRT2 are grouped into two categories based on substitution type and packaging variation:

Littelfuse PICO® II 251 Series (Manufacturer Recommended & Parametric Equivalents): Parts 0251007.MXL, 0251007.HAT1L, 0251007.MAT1L, 0251007.MRT1L, 0251007.NRT1JL, and 0251007.NRT1L maintain identical electrical specifications (7 A, 125 V AC/DC, fast-blow, 10.4 I²t, 50A AC/300A DC breaking capacity) and mechanical dimensions (0.110" Dia x 0.280" L). These parts differ only in packaging format (Bulk, Cut Tape, or Tape & Reel) and product status (Active vs. Obsolete). All carry CSA/cURus/TUV approvals and ROHS3 compliance.

SCHURTER 7010.7140.13 (Direct Manufacturer Equivalent): This part maintains the same current rating (7 A), voltage ratings (125 V AC/DC), response time (fast-blow), and mounting configuration (through-hole axial). Minor variations include melting I²t of 13 (vs. 10.4), breaking capacity of 300A (vs. 50A AC/300A DC), operating temperature range of -55°C to 85°C (vs. -55°C to 125°C), and physical dimensions of 0.093" Dia x 0.315" L (vs. 0.110" Dia x 0.280" L). Approvals include CSA and UR.

Key Parameters Determining Substitution:

Current Rating: 7 A (mandatory match)
Voltage Rating: 125 V AC and 125 V DC (mandatory match)
Response Time: Fast Blow (mandatory match)
Mounting Type: Through Hole (mandatory match)
Fuse Type: Board Mount, Cartridge Style Excluded (mandatory match)
Melting I²t: 10.4 (preferred for Littelfuse series)
Breaking Capacity: 50A AC minimum, 300A DC (preferred for Littelfuse series)
Operating Temperature: -55°C to 125°C (preferred for Littelfuse series)

Parameter Comparison

Part Number	Manufacturer	Current (A)	Voltage AC (V)	Voltage DC (V)	Response	I²t	Breaking Capacity	Temp Range (°C)	Packaging	Status	RoHS
0251007.NRT2	Littelfuse	7	125	125	Fast Blow	10.4	50A AC, 300A DC	-55 ~ 125	Axial	Obsolete	Non-compliant
0251007.MXL	Littelfuse	7	125	125	Fast Blow	10.4	50A AC, 300A DC	-55 ~ 125	Bulk	Active	ROHS3
0251007.HAT1L	Littelfuse	7	125	125	Fast Blow	10.4	50A AC, 300A DC	-55 ~ 125	Cut Tape	Active	ROHS3
0251007.MAT1L	Littelfuse	7	125	125	Fast Blow	10.4	50A AC, 300A DC	-55 ~ 125	Cut Tape	Active	ROHS3
0251007.MRT1L	Littelfuse	7	125	125	Fast Blow	10.4	50A AC, 300A DC	-55 ~ 125	Cut Tape	Active	ROHS3
0251007.NRT1JL	Littelfuse	7	125	125	Fast Blow	10.4	50A AC	-55 ~ 125	Tape & Reel	Active	ROHS3
0251007.NRT1L	Littelfuse	7	125	125	Fast Blow	10.4	50A AC, 300A DC	-55 ~ 125	Cut Tape	Active	ROHS3
0251007.PARJL	Littelfuse	7	125	125	Fast Blow	10.4	50A AC	-55 ~ 125	Tape & Reel	Active	ROHS3
7010.7140.13	SCHURTER	7	125	125	Fast Blow	13	300A DC	-55 ~ 85	Cartridge, Non-Standard (Axial)	Active	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Littelfuse PICO® II 251 Series): Parts 0251007.MXL, 0251007.HAT1L, 0251007.MAT1L, 0251007.MRT1L, 0251007.NRT1JL, 0251007.NRT1L, and 0251007.PARJL are direct functional equivalents with active product status and ROHS3 compliance. Selection among these parts depends on packaging requirements: 0251007.MXL for bulk procurement, Cut Tape variants (0251007.HAT1L, 0251007.MAT1L, 0251007.MRT1L, 0251007.NRT1L) for standard component handling, and Tape & Reel variants (0251007.NRT1JL, 0251007.PARJL) for automated assembly processes. All maintain identical electrical performance and thermal operating range (-55°C to 125°C).

Secondary Substitute (SCHURTER 7010.7140.13): This part is suitable for applications where the operating temperature maximum of 85°C is acceptable and where the higher melting I²t value (13 vs. 10.4) does not conflict with circuit protection requirements. The reduced breaking capacity specification (300A DC only, vs. 50A AC/300A DC) and slightly different physical dimensions (0.093" Dia x 0.315" L) require board layout verification. ROHS3 compliance and CSA/UR approvals are maintained.

Compliance Considerations: All substitute parts carry ROHS3 compliance and REACH Unaffected status, addressing regulatory requirements beyond the obsolete 0251007.NRT2. Littelfuse parts maintain CSA/cURus/TUV approvals; SCHURTER part carries CSA/UR approvals.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts interchangeably with the 0251007.NRT2?

A: Littelfuse PICO® II 251 series parts (0251007.MXL, 0251007.HAT1L, 0251007.MAT1L, 0251007.MRT1L, 0251007.NRT1JL, 0251007.NRT1L, 0251007.PARJL) are direct functional equivalents and can be used interchangeably. The SCHURTER 7010.7140.13 requires verification of operating temperature range and breaking capacity specifications for your specific application.

Q: What is the difference between the Littelfuse substitute parts?

A: All Littelfuse PICO® II 251 series substitutes maintain identical electrical and thermal specifications. Differences are limited to packaging format: Bulk (0251007.MXL), Cut Tape (0251007.HAT1L, 0251007.MAT1L, 0251007.MRT1L, 0251007.NRT1L), and Tape & Reel (0251007.NRT1JL, 0251007.PARJL). Selection depends on procurement and assembly process requirements.

Q: Why does the SCHURTER part have different specifications?

A: The SCHURTER 7010.7140.13 is a cross-manufacturer equivalent that maintains the same current rating, voltage ratings, and response time. However, it differs in melting I²t (13 vs. 10.4), breaking capacity specification format, maximum operating temperature (85°C vs. 125°C), and physical dimensions. These differences reflect different design and certification standards between manufacturers.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance. The original 0251007.NRT2 is RoHS non-compliant, making the substitutes suitable for applications requiring RoHS compliance.

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

A: For automated assembly, select Tape & Reel packaged parts: 0251007.NRT1JL or 0251007.PARJL. Both are active products with full ROHS3 compliance and identical electrical specifications to the obsolete 0251007.NRT2.

Q: Can I use the SCHURTER part in applications requiring -55°C to 125°C operation?

A: No. The SCHURTER 7010.7140.13 is rated for -55°C to 85°C operation only. For applications requiring the full -55°C to 125°C range, use Littelfuse PICO® II 251 series substitutes.

Q: What is the inventory status of these parts?

A: All substitute parts are in active production with available inventory. 0251007.NRT1L has the highest inventory level (175,060 pcs), followed by 0251007.MAT1L (2,612 pcs) and 0251007.MXL (2,361 pcs). Availability supports both immediate and long-term procurement needs.

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