Littelfuse 0251.500MAT1 Equivalent & Substitute Parts

Part Overview

The Littelfuse 0251.500MAT1 is a 500 mA, 125 V AC/DC board mount axial fuse from the PICO® II 251 series. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part 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	500 mA
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
Size / Dimension	0.110" Dia x 0.280" L (2.80mm x 7.11mm)
Breaking Capacity @ Rated Voltage	50 A AC, 300 A DC
DC Cold Resistance	0.302 Ohms
Melting I²t	0.0598
Operating Temperature Range	-55°C ~ 125°C
Approval Agencies	CCC, CSA, cURus, TUV

Substitute Part Grouping Explanation

Substitute parts for the 0251.500MAT1 are qualified based on identical electrical and mechanical parameters. All substitute parts maintain the same current rating (500 mA), voltage ratings (125 V AC/DC), response time (fast blow), mounting configuration (through hole), physical dimensions (0.110" Dia x 0.280" L), breaking capacity (50 A AC, 300 A DC), and thermal characteristics (melting I²t of 0.0598). The substitutes differ only in packaging format and product status. All substitute parts are active products with RoHS3 compliance and REACH unaffected status, providing improved availability compared to the obsolete main part.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating	Voltage AC/DC	Response Time	Mounting Type	Package	Product Status	RoHS Status	Inventory
0251.500MAT1	Littelfuse Inc.	PICO® II 251	500 mA	125 V / 125 V	Fast Blow	Through Hole	Axial	Obsolete	RoHS non-compliant	1039 Pcs
0251.500MAT1L	Littelfuse Inc.	PICO® II 251	500 mA	125 V / 125 V	Fast Blow	Through Hole	Cut Tape (CT)	Active	ROHS3 Compliant	8348 Pcs
0251.500HAT1L	Littelfuse Inc.	PICO® II 251	500 mA	125 V / 125 V	Fast Blow	Through Hole	Cut Tape (CT)	Active	ROHS3 Compliant	893 Pcs
0251.500NAT1L	Littelfuse Inc.	PICO® II 251	500 mA	125 V / 125 V	Fast Blow	Through Hole	Cut Tape (CT)	Active	ROHS3 Compliant	7125 Pcs
0251.500NAT6L	Littelfuse Inc.	PICO® II 251	500 mA	125 V / 125 V	Fast Blow	Through Hole	Tape & Box (TB)	Active	ROHS3 Compliant	895 Pcs
0251.500PAT1L	Littelfuse Inc.	PICO® II 251	500 mA	125 V / 125 V	Fast Blow	Through Hole	Tape & Box (TB)	Active	ROHS3 Compliant	1027 Pcs

Engineering Selection Recommendations

All listed substitute parts are electrically and mechanically equivalent to the 0251.500MAT1. Selection among substitutes should be based on packaging requirements and supply availability:

0251.500MAT1L provides the highest inventory availability (8348 Pcs) in Cut Tape format, suitable for automated assembly processes requiring tape-and-reel packaging.

0251.500NAT1L offers substantial inventory (7125 Pcs) in Cut Tape format as an alternative high-availability option.

0251.500NAT6L and 0251.500PAT1L are available in Tape & Box packaging, appropriate for applications requiring boxed component delivery. Both maintain active product status with full RoHS3 compliance.

All substitute parts carry identical regulatory approvals (CCC, CSA, cURus, TUV) and maintain the same thermal and electrical performance characteristics as the original part. The transition from the obsolete 0251.500MAT1 to any active substitute ensures continued compliance with current RoHS3 requirements.

Frequently Asked Questions (FAQ)

Q: Can 0251.500MAT1L be used as a direct replacement for 0251.500MAT1?

A: Yes. The 0251.500MAT1L is electrically and mechanically identical to the 0251.500MAT1, differing only in packaging format (Cut Tape vs. Axial bulk) and product status (Active vs. Obsolete). Both maintain identical electrical ratings, response characteristics, and physical dimensions.

Q: What is the difference between Cut Tape (CT) and Tape & Box (TB) packaging?

A: Cut Tape packaging delivers components on continuous tape suitable for automated pick-and-place assembly. Tape & Box packaging includes the same tape format but adds protective boxing for storage and handling. Both formats contain identical components with the same electrical specifications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts (0251.500MAT1L, 0251.500HAT1L, 0251.500NAT1L, 0251.500NAT6L, 0251.500PAT1L) are ROHS3 Compliant. The original 0251.500MAT1 is RoHS non-compliant due to its obsolete status.

Q: Do the substitute parts maintain the same breaking capacity?

A: Yes. All substitute parts maintain identical breaking capacity specifications of 50 A AC and 300 A DC at rated voltage, ensuring equivalent protection performance in circuit applications.

Q: Which substitute part should be selected for new production designs?

A: For new designs, select from the active substitute parts based on packaging requirements. 0251.500MAT1L, 0251.500HAT1L, or 0251.500NAT1L are recommended for automated assembly. 0251.500NAT6L or 0251.500PAT1L are suitable for manual assembly or applications requiring boxed delivery.

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