Littelfuse 025101.5NRT1 Equivalent & Substitute Parts

Part Overview

The Littelfuse 025101.5NRT1 is a 1.5 A, 125 V AC/DC axial board mount fuse from the PICO® II 251 series. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Active alternatives within the same electrical and mechanical specifications are available from both Littelfuse and cross-manufacturer sources.

Key Parameters

Parameter	Value
Current Rating	1.5 A
Voltage Rating (AC)	125 V
Voltage Rating (DC)	125 V
Response Time	Fast Blow
Mounting Type	Through Hole
Package / Case	Axial
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
Size / Dimension	0.110" Dia x 0.280" L (2.80mm x 7.11mm)
Approval Agencies	CSA, cURus, PSE, TUV

Substitute Part Grouping Explanation

Substitution for the 025101.5NRT1 is determined by strict equivalence 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
Breaking Capacity @ Rated Voltage: 50A AC, 300A DC (Littelfuse parts) or 300A (cross-manufacturer)
Melting I²t: 0.587 (Littelfuse parts) or 0.38 (cross-manufacturer alternative)
DC Cold Resistance: 0.0823 Ohms (Littelfuse parts)
Operating Temperature: -55°C ~ 125°C (Littelfuse parts) or -55°C ~ 85°C (cross-manufacturer)
Size / Dimension: 0.110" Dia x 0.280" L (Littelfuse parts) or 0.093" Dia x 0.315" L (cross-manufacturer)
Approval Agencies: CSA, cURus, PSE, TUV (Littelfuse parts) or CSA, UR (cross-manufacturer)

All Littelfuse substitutes maintain identical electrical and mechanical specifications. The SCHURTER 7010.7080.13 provides functional equivalence with minor dimensional and thermal operating range variations.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage AC/DC (V)	Response Time	Breaking Capacity (AC/DC)	Melting I²t	DC Cold Resistance (Ω)	Operating Temp (°C)	Size (Dia x L)	Packaging	Product Status	RoHS Status
025101.5NRT1	Littelfuse Inc.	1.5	125/125	Fast Blow	50A AC, 300A DC	0.587	0.0823	-55 ~ 125	0.110" x 0.280"	Bulk	Obsolete	Non-compliant
025101.5HAT1L	Littelfuse	1.5	125/125	Fast Blow	50A AC, 300A DC	0.587	0.0823	-55 ~ 125	0.110" x 0.280"	Cut Tape (CT)	Active	ROHS3 Compliant
025101.5MAT1L	Littelfuse Inc.	1.5	125/125	Fast Blow	50A AC, 300A DC	0.587	0.0823	-55 ~ 125	0.110" x 0.280"	Cut Tape (CT)	Active	ROHS3 Compliant
025101.5MRT1L	Littelfuse Inc.	1.5	125/125	Fast Blow	50A AC, 300A DC	0.587	0.0823	-55 ~ 125	0.110" x 0.280"	Cut Tape (CT)	Active	ROHS3 Compliant
025101.5NRT1L	Littelfuse Inc.	1.5	125/125	Fast Blow	50A AC, 300A DC	0.587	0.0823	-55 ~ 125	0.110" x 0.280"	Cut Tape (CT)	Active	ROHS3 Compliant
025101.5PARL	Littelfuse	1.5	125/125	Fast Blow	50A AC, 300A DC	0.587	0.0823	-55 ~ 125	0.110" x 0.280"	Tape & Reel (TR)	Active	ROHS3 Compliant
025101.5PF001L	Littelfuse Inc.	1.5	125/125	Fast Blow	50A AC, 300A DC	0.587	0.0823	-55 ~ 125	0.110" x 0.280"	Tape & Reel (TR)	Active	ROHS3 Compliant
025101.5PF002L	Littelfuse Inc.	1.5	125/125	Fast Blow	50A AC, 300A DC	0.587	0.0823	-55 ~ 125	0.110" x 0.280"	Tape & Reel (TR)	Active	ROHS3 Compliant
7010.7080.13	SCHURTER Inc.	1.5	125/125	Fast Blow	300A	0.38	—	-55 ~ 85	0.093" x 0.315"	Bulk	Active	ROHS3 Compliant

Engineering Selection Recommendations

All Littelfuse substitutes (025101.5HAT1L, 025101.5MAT1L, 025101.5MRT1L, 025101.5NRT1L, 025101.5PARL, 025101.5PF001L, 025101.5PF002L) are direct functional equivalents with active product status and ROHS3 compliance. These parts maintain identical electrical characteristics, dimensional specifications, and thermal operating ranges. Selection among Littelfuse alternatives is determined by packaging requirements: Cut Tape (CT) for automated assembly, Tape & Reel (TR) for high-volume production, or Bulk for manual assembly.

The SCHURTER 7010.7080.13 is a functional alternative with active status and ROHS3 compliance. This part operates within a reduced thermal range (-55°C ~ 85°C versus -55°C ~ 125°C) and exhibits lower melting I²t (0.38 versus 0.587). Dimensional differences (0.093" Dia x 0.315" L versus 0.110" Dia x 0.280" L) require PCB layout verification. Approval agencies differ: SCHURTER holds CSA and UR certifications versus Littelfuse's CSA, cURus, PSE, and TUV certifications.

Frequently Asked Questions (FAQ)

Q: Can I use any of the Littelfuse substitutes interchangeably with the 025101.5NRT1?

A: Yes. All Littelfuse substitutes maintain identical electrical and mechanical specifications. Differences are limited to packaging format (Bulk, Cut Tape, or Tape & Reel) and product status (all substitutes are active versus the obsolete original). Selection depends on assembly process requirements.

Q: What is the difference between Cut Tape (CT), Tape & Reel (TR), and Bulk packaging?

A: Cut Tape packaging provides individual component strips suitable for semi-automated or manual assembly. Tape & Reel packaging is optimized for high-speed automated pick-and-place equipment. Bulk packaging is used for manual assembly or custom packaging. All three formats contain identical components.

Q: Can I substitute the SCHURTER 7010.7080.13 for the Littelfuse 025101.5NRT1?

A: The SCHURTER part is functionally equivalent for 1.5 A, 125 V AC/DC fast-blow fuse applications. However, verify compatibility with your specific design: the reduced operating temperature range (-55°C ~ 85°C), lower melting I²t (0.38), different physical dimensions, and different approval certifications (CSA, UR) may affect suitability depending on application requirements.

Q: Why is the original 025101.5NRT1 marked as obsolete?

A: The 025101.5NRT1 is obsolete due to product lifecycle management. Active equivalents with improved compliance (ROHS3) and identical electrical performance are available from Littelfuse, making the original specification unnecessary for new designs.

Q: Are all substitute parts ROHS3 compliant?

A: All Littelfuse substitutes and the SCHURTER alternative are ROHS3 compliant. The original 025101.5NRT1 is non-compliant, which is one reason active alternatives are recommended for new applications.

Q: What approval agencies certify these fuses?

A: Littelfuse substitutes hold CSA, cURus, PSE, and TUV approvals. The SCHURTER 7010.7080.13 holds CSA and UR approvals. Verify that the selected part's certifications align with your application's regulatory requirements.

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