Littelfuse 0251.250MAT1 Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0251.250MAT1 is a 250 mA, 125 V AC/DC board mount axial fuse from the PICO® II 251 series. This part is classified as obsolete, which necessitates identification of active equivalent alternatives for new designs and ongoing production requirements. Direct functional equivalents are available within the same product series, differing primarily in packaging configuration and compliance status.

Key Parameters

Parameter	Value
Current Rating	250 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	0.0116
Operating Temperature Range	-55°C ~ 125°C
DC Cold Resistance	0.665 Ohms
Size / Dimension	0.110" Dia x 0.280" L (2.80mm x 7.11mm)
Approval Agency	CSA, cURus

Substitute Part Grouping Explanation

Substitution of the 0251.250MAT1 is determined by electrical and mechanical parameter equivalence within the PICO® II 251 series. All substitute parts maintain identical specifications for current rating, voltage ratings (AC and DC), response time, breaking capacity, melting I²t, operating temperature range, DC cold resistance, physical dimensions, and regulatory approvals.

The substitute parts differ only in packaging configuration and product status:

0251.250MAT1L: Cut Tape (CT) packaging, Active status, RoHS3 compliant
0251.250HAT1L: Cut Tape (CT) packaging, Active status, RoHS3 compliant
0251.250NAT1L: Cut Tape (CT) packaging, Active status, RoHS3 compliant, REACH Affected
0251.250PAT1L: Tape & Box (TB) packaging, Active status, RoHS3 compliant

All parts are manufactured by Littelfuse Inc. and carry identical electrical and thermal characteristics.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage AC/DC	Response Time	Breaking Capacity	Melting I²t	Operating Temp	DC Resistance	Packaging	Product Status	RoHS Status
0251.250MAT1	Littelfuse Inc.	250 mA	125V / 125V	Fast Blow	50A AC, 300A DC	0.0116	-55°C ~ 125°C	0.665 Ω	Axial	Obsolete	Non-compliant
0251.250MAT1L	Littelfuse Inc.	250 mA	125V / 125V	Fast Blow	50A AC, 300A DC	0.0116	-55°C ~ 125°C	0.665 Ω	Cut Tape (CT)	Active	RoHS3 Compliant
0251.250HAT1L	Littelfuse Inc.	250 mA	125V / 125V	Fast Blow	50A AC, 300A DC	0.0116	-55°C ~ 125°C	0.665 Ω	Cut Tape (CT)	Active	RoHS3 Compliant
0251.250NAT1L	Littelfuse Inc.	250 mA	125V / 125V	Fast Blow	50A AC, 300A DC	0.0116	-55°C ~ 125°C	0.665 Ω	Cut Tape (CT)	Active	RoHS3 Compliant
0251.250PAT1L	Littelfuse	250 mA	125V / 125V	Fast Blow	50A AC, 300A DC	0.0116	-55°C ~ 125°C	0.665 Ω	Tape & Box (TB)	Active	RoHS3 Compliant

Engineering Selection Recommendations

The 0251.250MAT1 is obsolete and should be replaced with an active equivalent. All four substitute parts provide identical electrical and thermal performance. Selection should be based on packaging requirements and supply chain considerations:

For automated assembly with tape feeding: 0251.250MAT1L, 0251.250HAT1L, or 0251.250NAT1L (Cut Tape packaging)

For manual assembly or bulk packaging: 0251.250PAT1L (Tape & Box packaging)

For RoHS3 compliance: All substitute parts meet RoHS3 requirements, whereas the original 0251.250MAT1 does not.

For REACH compliance: 0251.250PAT1L, 0251.250MAT1L, and 0251.250HAT1L are REACH Unaffected. 0251.250NAT1L is REACH Affected.

All substitute parts carry CSA and cURus regulatory approvals identical to the original part.

Frequently Asked Questions (FAQ)

Q: Can 0251.250MAT1L be used as a direct replacement for 0251.250MAT1?

A: Yes. Both parts are electrically and mechanically identical. The primary difference is packaging format (Cut Tape vs. unspecified original packaging) and product status (Active vs. Obsolete). The substitute is RoHS3 compliant.

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

A: Cut Tape (CT) packaging is supplied on continuous tape suitable for automated pick-and-place equipment. Tape & Box (TB) packaging includes the same tape format but with additional box packaging for storage and handling. Both formats contain the same component with identical electrical specifications.

Q: Are all substitute parts suitable for new product designs?

A: Yes. All four substitute parts carry Active product status and are suitable for new designs. They all meet current RoHS3 compliance requirements.

Q: Does REACH status affect component selection?

A: REACH status indicates regulatory substance tracking requirements. 0251.250NAT1L is REACH Affected, while 0251.250PAT1L, 0251.250MAT1L, and 0251.250HAT1L are REACH Unaffected. Selection depends on your supply chain and regulatory requirements.

Q: Are the electrical characteristics identical across all substitute parts?

A: Yes. All substitute parts maintain identical current rating (250 mA), voltage ratings (125 V AC/DC), response time (Fast Blow), breaking capacity (50A AC, 300A DC), melting I²t (0.0116), operating temperature range (-55°C ~ 125°C), and DC cold resistance (0.665 Ohms).

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