Littelfuse 025101.5NRT2 Equivalent & Substitute Parts

Part Overview

The Littelfuse 025101.5NRT2 is a 1.5 A, 125 V AC/DC board mount axial fuse from the PICO® II 251 series. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The fuse is designed for through-hole mounting applications requiring fast-blow response characteristics with a breaking capacity of 50 A AC and 300 A DC at rated voltage.

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
Fuse Type	Board Mount (Cartridge Style Excluded)
Package / Case	Axial
Breaking Capacity @ Rated Voltage	50 A AC, 300 A DC
Melting I²t	0.587
Operating Temperature Range	-55°C ~ 125°C
DC Cold Resistance	0.0823 Ohms
Size / Dimension	0.110" Dia x 0.280" L (2.80 mm x 7.11 mm)
Approval Agencies	CSA, cURus, PSE, TUV

Substitute Part Grouping Explanation

Substitution for the obsolete 025101.5NRT2 is based on strict electrical and mechanical parameter matching within the PICO® II 251 series. All substitute parts maintain identical current ratings (1.5 A), voltage ratings (125 V AC/DC), response time (fast blow), mounting configuration (through hole), physical dimensions (0.110" Dia x 0.280" L), melting I²t (0.587), breaking capacity (50 A AC, 300 A DC), and approval certifications (CSA, cURus, PSE, TUV).

The primary distinction among substitutes is packaging format: bulk, cut tape (CT), or tape & reel (TR). The recommended manufacturer substitute is 025101.5MXL (bulk packaging, active status, RoHS3 compliant). Parametric equivalents include 025101.5HAT1L, 025101.5MAT1L, 025101.5MRT1L, 025101.5NRT1L, 025101.5PARL, 025101.5PF001L, and 025101.5PF002L, all offering identical electrical performance with active product status and RoHS3 compliance.

The cross-manufacturer alternative is SCHURTER 7010.7080.13, which maintains the same current, voltage, and response characteristics but differs in package case (cartridge, non-standard axial), melting I²t (0.38), breaking capacity (300 A only), operating temperature range (-55°C ~ 85°C), and physical dimensions (0.093" Dia x 0.315" L).

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage AC/DC (V)	Response Time	Mounting Type	Package / Case	Melting I²t	Breaking Capacity @ Rated Voltage	Operating Temperature	DC Cold Resistance (Ω)	Product Status	RoHS Status
025101.5NRT2	Littelfuse	1.5	125/125	Fast Blow	Through Hole	Axial	0.587	50 A AC, 300 A DC	-55°C ~ 125°C	0.0823	Obsolete	Non-compliant
025101.5MXL	Littelfuse Inc.	1.5	125/125	Fast Blow	Through Hole	Axial	0.587	50 A AC, 300 A DC	-55°C ~ 125°C	0.0823	Active	RoHS3 Compliant
025101.5HAT1L	Littelfuse	1.5	125/125	Fast Blow	Through Hole	Axial	0.587	50 A AC, 300 A DC	-55°C ~ 125°C	0.0823	Active	RoHS3 Compliant
025101.5MAT1L	Littelfuse Inc.	1.5	125/125	Fast Blow	Through Hole	Axial	0.587	50 A AC, 300 A DC	-55°C ~ 125°C	0.0823	Active	RoHS3 Compliant
025101.5MRT1L	Littelfuse Inc.	1.5	125/125	Fast Blow	Through Hole	Axial	0.587	50 A AC, 300 A DC	-55°C ~ 125°C	0.0823	Active	RoHS3 Compliant
025101.5NRT1L	Littelfuse Inc.	1.5	125/125	Fast Blow	Through Hole	Axial	0.587	50 A AC, 300 A DC	-55°C ~ 125°C	0.0823	Active	RoHS3 Compliant
025101.5PARL	Littelfuse	1.5	125/125	Fast Blow	Through Hole	Axial	0.587	50 A AC, 300 A DC	-55°C ~ 125°C	0.0823	Active	RoHS3 Compliant
025101.5PF001L	Littelfuse Inc.	1.5	125/125	Fast Blow	Through Hole	Axial	0.587	50 A AC, 300 A DC	-55°C ~ 125°C	0.0823	Active	RoHS3 Compliant
025101.5PF002L	Littelfuse Inc.	1.5	125/125	Fast Blow	Through Hole	Axial	0.587	50 A AC, 300 A DC	-55°C ~ 125°C	0.0823	Active	RoHS3 Compliant
7010.7080.13	SCHURTER Inc.	1.5	125/125	Fast Blow	Through Hole	Cartridge, Non-Standard (Axial)	0.38	300 A DC	-55°C ~ 85°C	Not specified	Active	RoHS3 Compliant

Engineering Selection Recommendations

For direct replacement of the obsolete 025101.5NRT2, select from the active Littelfuse PICO® II 251 series substitutes. All Littelfuse alternatives (025101.5MXL, 025101.5HAT1L, 025101.5MAT1L, 025101.5MRT1L, 025101.5NRT1L, 025101.5PARL, 025101.5PF001L, 025101.5PF002L) provide identical electrical and mechanical specifications with RoHS3 compliance and active product status.

Packaging selection depends on procurement requirements: 025101.5MXL for bulk quantities, cut tape variants (HAT1L, MAT1L, MRT1L, NRT1L) for automated assembly, or tape & reel options (PARL, PF001L, PF002L) for high-volume production.

The SCHURTER 7010.7080.13 is a cross-manufacturer alternative suitable only when Littelfuse parts are unavailable. This part maintains current and voltage ratings but differs in melting I²t (0.38 vs. 0.587), breaking capacity specification (300 A DC only vs. 50 A AC/300 A DC), operating temperature maximum (85°C vs. 125°C), and physical dimensions. These differences may affect circuit protection characteristics and thermal performance in applications requiring the full operating temperature range or higher AC breaking capacity.

Frequently Asked Questions (FAQ)

Q: Can 025101.5MXL directly replace 025101.5NRT2 in existing designs?

A: Yes. Both parts share identical electrical ratings (1.5 A, 125 V AC/DC), response time (fast blow), melting I²t (0.587), breaking capacity (50 A AC, 300 A DC), physical dimensions (0.110" Dia x 0.280" L), and approval certifications. The primary difference is product status: 025101.5NRT2 is obsolete while 025101.5MXL is active with RoHS3 compliance.

Q: What is the difference between the various Littelfuse substitute part numbers?

A: All Littelfuse substitutes (025101.5MXL, 025101.5HAT1L, 025101.5MAT1L, 025101.5MRT1L, 025101.5NRT1L, 025101.5PARL, 025101.5PF001L, 025101.5PF002L) are electrically and mechanically identical. Differences exist only in packaging format: bulk (MXL), cut tape (HAT1L, MAT1L, MRT1L, NRT1L), or tape & reel (PARL, PF001L, PF002L). Selection depends on assembly method and procurement volume.

Q: Is SCHURTER 7010.7080.13 a suitable substitute?

A: SCHURTER 7010.7080.13 maintains the same current rating (1.5 A) and voltage ratings (125 V AC/DC) but differs in critical parameters. The melting I²t is lower (0.38 vs. 0.587), breaking capacity is specified as 300 A DC only (not 50 A AC), operating temperature maximum is 85°C (not 125°C), and physical dimensions differ (0.093" Dia x 0.315" L). Use only if Littelfuse parts are unavailable and circuit requirements accommodate these differences.

Q: Are all substitute parts RoHS compliant?

A: All active Littelfuse substitutes are RoHS3 compliant. The original 025101.5NRT2 is RoHS non-compliant. SCHURTER 7010.7080.13 is also RoHS3 compliant.

Q: What approval certifications do these parts carry?

A: All Littelfuse substitutes carry CSA, cURus, PSE, and TUV certifications, matching the original part. SCHURTER 7010.7080.13 carries CSA and UR certifications.

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

A: For automated pick-and-place assembly, select tape & reel packaging: 025101.5PARL, 025101.5PF001L, or 025101.5PF002L. For semi-automated or manual assembly, cut tape variants (025101.5HAT1L, 025101.5MAT1L, 025101.5MRT1L, 025101.5NRT1L) are suitable. For low-volume or prototype applications, bulk packaging (025101.5MXL) is appropriate.

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