Littelfuse 0251003.PARL Board Mount Fuse 3A 125VAC/VDC Axial Equivalent & Substitute Parts

Part Overview

The Littelfuse 0251003.PARL is a 3A 125VAC/125VDC board mount fuse in axial package configuration, part of the PICO® II 251 series. This through-hole component is designed for circuit protection in electronic applications requiring fast-blow response characteristics. The part is currently active in production status with full regulatory compliance across multiple approval agencies. Substitute parts are identified based on identical electrical specifications and mechanical compatibility, with variations limited to packaging format and lead configuration.

Key Parameters

Parameter	Specification
Current Rating	3 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 (AC)	50 A
Breaking Capacity (DC)	300 A
Melting I²t	1.19
Size / Dimension	0.110" Dia x 0.280" L (2.80mm x 7.11mm)
DC Cold Resistance	0.0295 Ohms
Operating Temperature Range	-55°C to 125°C
Series	PICO® II 251
RoHS Status	ROHS3 Compliant
Approval Agencies	CCC, CSA, cURus, PSE, TUV

Substitute Part Grouping Explanation

Substitute parts for the 0251003.PARL are qualified based on identical electrical and mechanical parameters across all critical specifications. The substitution criteria are strictly limited to the following parameters:

Current Rating: 3 A (exact match required)
Voltage Rating: 125 V AC / 125 V DC (exact match required)
Response Time: Fast Blow (exact match required)
Breaking Capacity: 50 A AC / 300 A DC (exact match required)
Melting I²t: 1.19 (exact match required)
DC Cold Resistance: 0.0295 Ohms (exact match required)
Operating Temperature Range: -55°C to 125°C (exact match required)
Package / Case: Axial (exact match required)
Mounting Type: Through Hole (exact match required)
Series: PICO® II 251 (exact match required)
Regulatory Compliance: CCC, CSA, cURus, PSE, TUV (exact match required)

All substitute parts listed below meet these criteria. Variations exist only in packaging format (Tape & Reel versus Cut Tape) and internal lead configuration designations, which do not affect electrical performance or mechanical fit in board-level applications.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage (AC/DC)	Response Time	Breaking Capacity (AC/DC)	Melting I²t	DC Cold Resistance	Operating Temperature	Packaging	Inventory Status
0251003.PARL	Littelfuse Inc.	3 A	125 V / 125 V	Fast Blow	50 A / 300 A	1.19	0.0295 Ω	-55°C to 125°C	Tape & Reel (TR)	946 Pcs
0251003.HAT1L	Littelfuse Inc.	3 A	125 V / 125 V	Fast Blow	50 A / 300 A	1.19	0.0295 Ω	-55°C to 125°C	Cut Tape (CT)	1110 Pcs
0251003.MAT1L	Littelfuse Inc.	3 A	125 V / 125 V	Fast Blow	50 A / 300 A	1.19	0.0295 Ω	-55°C to 125°C	Cut Tape (CT)	3818 Pcs
0251003.MRT1L	Littelfuse Inc.	3 A	125 V / 125 V	Fast Blow	50 A / 300 A	1.19	0.0295 Ω	-55°C to 125°C	Cut Tape (CT)	1800 Pcs
0251003.NAT1L	Littelfuse Inc.	3 A	125 V / 125 V	Fast Blow	50 A / 300 A	1.19	0.0295 Ω	-55°C to 125°C	Cut Tape (CT)	5058 Pcs
0251003.NRT1L	Littelfuse Inc.	3 A	125 V / 125 V	Fast Blow	50 A / 300 A	1.19	0.0295 Ω	-55°C to 125°C	Cut Tape (CT)	184357 Pcs

Engineering Selection Recommendations

All substitute parts listed maintain identical electrical performance and mechanical compatibility with the primary part 0251003.PARL. Selection between the main part and substitutes should be based on the following factors:

Packaging Format Consideration: The primary part 0251003.PARL is supplied in Tape & Reel (TR) format, suitable for automated assembly processes. Substitute parts 0251003.HAT1L, 0251003.MAT1L, 0251003.MRT1L, 0251003.NAT1L, and 0251003.NRT1L are supplied in Cut Tape (CT) format, appropriate for manual or semi-automated placement operations.

Regulatory Compliance: All parts carry identical approval certifications from CCC, CSA, cURus, PSE, and TUV, ensuring compliance with applicable safety and performance standards across all markets.

Product Status: All parts maintain active production status with no planned obsolescence, ensuring long-term availability for production and field replacement applications.

Inventory Availability: Part 0251003.NRT1L offers the highest inventory level at 184,357 pieces, followed by 0251003.NAT1L at 5,058 pieces. The primary part 0251003.PARL maintains 946 pieces in stock.

Frequently Asked Questions (FAQ)

Q: Can I substitute 0251003.PARL with any of the listed Cut Tape parts in my circuit design?

A: Yes. All substitute parts are electrically and mechanically identical to 0251003.PARL. The only difference is packaging format. If your assembly process accommodates Cut Tape components, substitution is direct with no circuit modifications required.

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

A: Tape & Reel (TR) packaging supplies components on continuous carrier tape suitable for automated pick-and-place equipment. Cut Tape (CT) packaging provides the same components on tape segments, typically used for manual placement or lower-volume assembly operations. Electrical and mechanical specifications are identical.

Q: Are all substitute parts from the same manufacturer?

A: Yes. All parts listed, including the primary part 0251003.PARL and all substitutes, are manufactured by Littelfuse Inc. and belong to the PICO® II 251 series.

Q: Do the substitute parts have the same regulatory approvals?

A: Yes. All parts carry identical certifications: CCC, CSA, cURus, PSE, and TUV. RoHS3 compliance and REACH unaffected status are consistent across all parts.

Q: Can I mix packaging formats in the same production run?

A: Packaging format selection should align with your assembly equipment capabilities. Mixing formats within a single production run may require process adjustments. Consult your assembly documentation for specific handling requirements.

Q: What is the lead configuration difference indicated by the part number suffixes?

A: The suffixes (HAT1L, MAT1L, MRT1L, NAT1L, NRT1L) indicate internal lead configuration designations. These variations do not affect electrical performance, mechanical fit, or circuit compatibility. All configurations are functionally equivalent for board-level applications.

Q: Which substitute part should I select for maximum inventory availability?

A: Part 0251003.NRT1L offers the highest inventory level at 184,357 pieces, providing optimal availability for high-volume production or extended supply chain requirements.

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