Littelfuse 0251002.MAT1 2A 125VAC/VDC Board Mount Axial Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0251002.MAT1 is a 2A 125VAC/VDC board mount axial fuse from the PICO® II 251 series. This part is currently obsolete. Equivalent and substitute parts are available in active product status with improved compliance characteristics, including RoHS3 compliance and REACH unaffected status. Substitution is necessary due to the obsolete status of the original part number.

Key Parameters

Parameter	Value
Current Rating	2 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
Size / Dimension	0.110" Dia x 0.280" L (2.80mm x 7.11mm)
Breaking Capacity @ Rated Voltage	50A AC, 300A DC
Melting I²t	0.405
DC Cold Resistance	0.0473 Ohms
Operating Temperature Range	-55°C ~ 125°C
Approval Agency	CCC, CSA, cURus, PSE, TUV

Substitute Part Grouping Explanation

Substitute parts for the 0251002.MAT1 are determined by strict equivalence across the following critical parameters:

Current Rating: 2 A
Voltage Rating: 125 V AC / 125 V DC
Response Time: Fast Blow
Mounting Type: Through Hole
Package / Case: Axial
Physical Dimensions: 0.110" Dia x 0.280" L (2.80mm x 7.11mm)
Melting I²t: 0.405
DC Cold Resistance: 0.0473 Ohms
Operating Temperature: -55°C ~ 125°C

All substitute parts maintain identical electrical and mechanical specifications. Variations exist only in packaging format (Cut Tape vs. Tape & Box), product status (Active vs. Obsolete), and compliance certifications (RoHS3 Compliant vs. RoHS non-compliant).

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating	Voltage AC/DC	Response Time	Breaking Capacity	Melting I²t	DC Cold Resistance	Operating Temp	Packaging	Product Status	RoHS Status
0251002.MAT1	Littelfuse	PICO® II 251	2 A	125V / 125V	Fast Blow	50A AC, 300A DC	0.405	0.0473 Ω	-55°C ~ 125°C	Bulk	Obsolete	RoHS non-compliant
0251002.MAT1L	Littelfuse	PICO® II 251	2 A	125V / 125V	Fast Blow	50A AC, 300A DC	0.405	0.0473 Ω	-55°C ~ 125°C	Cut Tape (CT)	Active	ROHS3 Compliant
0251002.HAT1L	Littelfuse	PICO® II 251	2 A	125V / 125V	Fast Blow	50A AC, 300A DC	0.405	0.0473 Ω	-55°C ~ 125°C	Cut Tape (CT)	Active	ROHS3 Compliant
0251002.NAT1L	Littelfuse	PICO® II 251	2 A	125V / 125V	Fast Blow	50A AC, 300A DC	0.405	0.0473 Ω	-55°C ~ 125°C	Cut Tape (CT)	Active	ROHS3 Compliant
0251002.NAT6L	Littelfuse	PICO® II 251	2 A	125V / 125V	Fast Blow	50A AC, 300A DC	0.405	0.0473 Ω	-55°C ~ 125°C	Tape & Box (TB)	Active	ROHS3 Compliant
0251002.PAT1L	Littelfuse	PICO® II 251	2 A	125V / 125V	Fast Blow	50A AC, 300A DC	0.405	0.0473 Ω	-55°C ~ 125°C	Tape & Box (TB)	Active	ROHS3 Compliant
0491002.MAT1	Littelfuse	PICO® II 491	2 A	125V / 125V	Fast Blow	50A AC	0.405	0.0473 Ω	-55°C ~ 125°C	Tape & Box (TB)	Active	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts maintain full electrical and mechanical equivalence to the 0251002.MAT1. Selection criteria are based on product status and compliance requirements:

Primary Recommendation: 0251002.MAT1L, 0251002.HAT1L, or 0251002.NAT1L from the PICO® II 251 series. These parts are active products with RoHS3 compliance and REACH unaffected status. They are direct functional equivalents with identical electrical characteristics and dimensional specifications.

Packaging Considerations: Cut Tape (CT) packaging (0251002.MAT1L, 0251002.HAT1L, 0251002.NAT1L) is suitable for automated assembly processes. Tape & Box (TB) packaging (0251002.NAT6L, 0251002.PAT1L) is appropriate for manual assembly or lower-volume applications.

Alternative Series: 0491002.MAT1 from the PICO® II 491 series maintains identical electrical specifications and physical dimensions. This part differs in approval agency certifications (CSA, PSE, UL vs. CCC, CSA, cURus, PSE, TUV) and has a reduced breaking capacity specification (50A AC only, without DC specification). Use this part only when the reduced certification set and breaking capacity specification are acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 0251002.MAT1 with any of the listed substitute parts?

A: Yes. All substitute parts maintain identical current rating (2A), voltage rating (125V AC/DC), response time (Fast Blow), physical dimensions (0.110" Dia x 0.280" L), and electrical characteristics (Melting I²t 0.405, DC Cold Resistance 0.0473 Ohms). Direct substitution is electrically and mechanically compatible.

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

A: Cut Tape packaging is supplied on continuous tape suitable for automated pick-and-place assembly equipment. Tape & Box packaging includes the same tape format but is boxed for manual handling and lower-volume applications. Electrical and mechanical specifications are identical.

Q: Why is 0491002.MAT1 listed as a substitute if it is from a different series?

A: The 0491002.MAT1 maintains identical electrical specifications (2A, 125V AC/DC, Fast Blow response) and physical dimensions. However, it differs in approval agency certifications and breaking capacity specification. Use this part only when the certification and breaking capacity differences are acceptable for your application.

Q: Is the 0251002.MAT1 still available?

A: The 0251002.MAT1 is obsolete. Active equivalent parts are available: 0251002.MAT1L, 0251002.HAT1L, 0251002.NAT1L, 0251002.NAT6L, and 0251002.PAT1L. These parts are recommended for new designs and production.

Q: What compliance certifications apply to the substitute parts?

A: PICO® II 251 series parts (0251002.MAT1L, 0251002.HAT1L, 0251002.NAT1L, 0251002.NAT6L, 0251002.PAT1L) carry CCC, CSA, cURus, PSE, and TUV approvals with RoHS3 compliance and REACH unaffected status. The PICO® II 491 series part (0491002.MAT1) carries CSA, PSE, and UL approvals with RoHS3 compliance and REACH unaffected status.

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