Littelfuse 0472001.NRT1L Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0472001.NRT1L is a 1 A, 125 V AC/DC board mount axial fuse with slow blow response characteristics, designed for through-hole mounting applications. This PICO® II 472 series fuse is actively produced and widely stocked. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design alternatives where packaging or approval agency requirements differ.

Key Parameters

Parameter	Value
Current Rating	1 A
Voltage Rating (AC)	125 V
Voltage Rating (DC)	125 V
Response Time	Slow Blow
Mounting Type	Through Hole
Fuse Type	Board Mount (Cartridge Style Excluded)
Package / Case	Axial
Physical Dimensions	0.110" Dia x 0.280" L (2.80mm x 7.11mm)
Breaking Capacity	50 A @ Rated Voltage
Operating Temperature Range	-55°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 0472001.NRT1L is determined by strict equivalence across the following critical parameters:

Current Rating: 1 A (exact match required)
Voltage Rating: 125 V AC and 125 V DC (exact match required)
Response Time: Slow Blow (exact match required)
Mounting Type: Through Hole (exact match required)
Fuse Type: Board Mount, Axial (exact match required)
Physical Dimensions: 0.110" Dia x 0.280" L (exact match required)
Breaking Capacity: 50 A @ Rated Voltage (exact match required)

Substitute parts may differ in packaging format (Tape & Reel versus Cut Tape), series designation within the PICO® II family, approval agency certifications, and DC cold resistance values, provided all electrical and mechanical parameters remain identical.

Parameter Comparison

Parameter	0472001.NRT1L (Main)	0471001.NRT1L	0472001.MRT1L
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	1 A	1 A	1 A
Voltage Rating - AC	125 V	125 V	125 V
Voltage Rating - DC	125 V	125 V	125 V
Response Time	Slow Blow	Slow Blow	Slow Blow
Mounting Type	Through Hole	Through Hole	Through Hole
Fuse Type	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)
Package / Case	Axial	Axial	Axial
Size / Dimension	0.110" Dia x 0.280" L (2.80mm x 7.11mm)	0.110" Dia x 0.280" L (2.80mm x 7.11mm)	0.110" Dia x 0.280" L (2.80mm x 7.11mm)
Breaking Capacity @ Rated Voltage	50 A	50 A	50 A
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Packaging Format	Tape & Reel (TR)	Cut Tape (CT)	Cut Tape (CT)
Series	PICO® II 472	PICO® II 471	PICO® II 472
Approval Agency	UR	CSA, PSE, UR	UR
DC Cold Resistance	0.078 Ohms	0.085 Ohms	0.078 Ohms
Melting I²t	0.9384	0.722	0.9384
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

All three parts are active products manufactured by Littelfuse Inc. and comply with ROHS3 requirements. Selection between the main part and substitutes is based on packaging and certification requirements:

0472001.NRT1L (Main Part): Supplied in Tape & Reel format with UR approval. Suitable for high-volume automated assembly processes.

0471001.NRT1L: Supplied in Cut Tape format with expanded approval agency coverage (CSA, PSE, UR). Melting I²t value of 0.722 differs from the main part; DC cold resistance is 0.085 Ohms. This part is appropriate for applications requiring CSA or PSE certification or for lower-volume manual assembly workflows.

0472001.MRT1L: Supplied in Cut Tape format with UR approval. Melting I²t and DC cold resistance values match the main part (0.9384 and 0.078 Ohms respectively). This part is appropriate for applications requiring Cut Tape packaging while maintaining identical electrical characteristics to the main part.

Frequently Asked Questions (FAQ)

Q: Can 0471001.NRT1L be used as a direct replacement for 0472001.NRT1L?

A: Electrical and mechanical parameters are identical. However, the melting I²t value (0.722 versus 0.9384) and DC cold resistance (0.085 versus 0.078 Ohms) differ. Verify that these differences are acceptable for your application before substitution.

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

A: Tape & Reel packaging is optimized for automated high-speed pick-and-place assembly. Cut Tape packaging is supplied in smaller quantities on tape without the reel and is suitable for manual assembly or lower-volume production.

Q: Are all three parts interchangeable on the PCB?

A: Yes, all three parts have identical physical dimensions (0.110" Dia x 0.280" L), mounting type (Through Hole), and fuse characteristics (1 A, 125 V AC/DC, Slow Blow, 50 A breaking capacity). PCB footprints are identical.

Q: Which part should I select if my design requires CSA certification?

A: Select 0471001.NRT1L, which carries CSA, PSE, and UR approvals. The main part (0472001.NRT1L) and 0472001.MRT1L carry only UR approval.

Q: Does packaging format affect electrical performance?

A: No. Packaging format (Tape & Reel versus Cut Tape) affects only supply and assembly logistics, not electrical or thermal performance.

Q: What does "Slow Blow" response time mean?

A: Slow Blow fuses tolerate brief current surges without opening, responding only to sustained overcurrent conditions. All three parts share this characteristic.

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