Littelfuse 0251.375NRT1L Equivalent & Substitute Parts

Part Overview

The Littelfuse 0251.375NRT1L is a 375 mA, 125 V AC/DC board mount axial fuse in the PICO® II 251 series. This through-hole component is designed for circuit protection in applications requiring fast-blow response characteristics. The part is actively manufactured and widely stocked, with 37,044 units available in Tape & Reel packaging. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across different packaging formats or from alternative manufacturers meeting the same performance specifications.

Key Parameters

Parameter	Value
Current Rating	375 mA
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	0.0296
Operating Temperature Range	-55°C ~ 125°C
DC Cold Resistance	0.395 Ohms
Approval Agencies	CSA, cURus
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 0251.375NRT1L is determined by strict equivalence across the following critical parameters: current rating (375 mA), voltage ratings (125 V AC and 125 V DC), response time (Fast Blow), mounting type (Through Hole), package case style (Axial), breaking capacity, melting I²t value, operating temperature range, and regulatory compliance (CSA, cURus certification).

Littelfuse parts 0251.375HAT1L and 0251.375MAT1L are parametric equivalents differing only in packaging format (Cut Tape instead of Tape & Reel). The SCHURTER part 7010.7040.13 is a direct manufacturer substitute with identical electrical specifications but differs in package case designation (Cartridge, Non-Standard Axial), operating temperature maximum (85°C vs. 125°C), and melting I²t value (0.019 vs. 0.0296), with breaking capacity limited to 300A DC.

Parameter Comparison

Parameter	0251.375NRT1L	0251.375HAT1L	0251.375MAT1L	0251.375MRT1L	7010.7040.13
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse	Littelfuse Inc.	SCHURTER Inc.
Current Rating (Amps)	375 mA	375 mA	375 mA	375 mA	375 mA
Voltage Rating - AC	125 V	125 V	125 V	125 V	125 V
Voltage Rating - DC	125 V	125 V	125 V	125 V	125 V
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Axial	Axial	Axial	Axial	Cartridge, Non-Standard (Axial)
Breaking Capacity @ Rated Voltage	50A AC, 300A DC	50A AC, 300A DC	50A AC, 300A DC	50A AC, 300A DC	300A
Melting I²t	0.0296	0.0296	0.0296	0.0296	0.019
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 85°C
DC Cold Resistance	0.395 Ohms	0.395 Ohms	0.395 Ohms	0.395 Ohms	0.395 Ohms
Approval Agency	CSA, cURus	CSA, cURus	CSA, cURus	CSA, cURus	CSA, UR
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Tape & Reel (TR)	Cut Tape (CT)	Cut Tape (CT)	Cut Tape (CT)	Bulk
Inventory (Pcs)	37,044	1,095	1,238	4,366	1,225

Engineering Selection Recommendations

The Littelfuse parts 0251.375HAT1L, 0251.375MAT1L, and 0251.375MRT1L are direct parametric equivalents to the 0251.375NRT1L, with identical electrical and thermal specifications. Selection among these Littelfuse variants is determined by packaging requirements: Tape & Reel for automated assembly, Cut Tape for manual or mixed-volume applications, and inventory availability.

The SCHURTER 7010.7040.13 is a functional substitute with equivalent current, voltage, and response characteristics. However, this part exhibits a reduced maximum operating temperature (85°C versus 125°C) and lower melting I²t value (0.019 versus 0.0296), which may affect thermal performance in high-temperature environments. The SCHURTER part carries CSA and UR certifications, meeting regulatory requirements for most applications. Selection of the SCHURTER substitute should be confirmed against specific application temperature and thermal stress requirements.

Frequently Asked Questions (FAQ)

Q: Can 0251.375HAT1L, 0251.375MAT1L, and 0251.375MRT1L be used interchangeably with 0251.375NRT1L?

A: Yes. These Littelfuse parts are parametric equivalents with identical electrical specifications, current rating, voltage ratings, response time, and thermal characteristics. Differences are limited to packaging format (Tape & Reel versus Cut Tape). Selection depends on assembly process requirements and inventory availability.

Q: What are the limitations of using SCHURTER 7010.7040.13 as a substitute?

A: The SCHURTER part maintains equivalent current, voltage, and response characteristics but operates at a maximum temperature of 85°C compared to 125°C for Littelfuse parts. The melting I²t value is lower (0.019 versus 0.0296), indicating faster thermal response. Applications requiring sustained operation above 85°C or specific thermal stress characteristics should use Littelfuse equivalents.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts, including the SCHURTER 7010.7040.13, are ROHS3 compliant and meet environmental regulatory requirements.

Q: What certifications apply to each substitute part?

A: Littelfuse parts 0251.375NRT1L, 0251.375HAT1L, 0251.375MAT1L, and 0251.375MRT1L carry CSA and cURus certifications. The SCHURTER 7010.7040.13 carries CSA and UR certifications. Both certification sets meet standard safety requirements for board mount fuses.

Q: How does packaging format affect part selection?

A: Tape & Reel packaging (0251.375NRT1L) is optimized for automated pick-and-place assembly. Cut Tape packaging (0251.375HAT1L, 0251.375MAT1L, 0251.375MRT1L) is suitable for manual assembly or lower-volume production. Bulk packaging (7010.7040.13) is used for high-volume applications or custom assembly processes. Electrical performance is identical across all packaging formats for Littelfuse equivalents.

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