Littelfuse 0251012.MAT1L Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0251012.MAT1L is a 12 A, 32 V AC/DC board mount fuse in the PICO® II 251 series, designed for through-hole axial mounting applications. This fast-blow fuse is actively manufactured and widely used in circuit protection applications requiring reliable overcurrent protection at low voltage levels. Finding equivalent substitute parts becomes necessary when the original packaging format (Tape & Box) is unavailable or when alternative packaging options better suit procurement, inventory, or assembly requirements.

Key Parameters

Parameter	Value
Manufacturer	Littelfuse Inc.
Series	PICO® II 251
Current Rating	12 A
Voltage Rating (AC)	32 V
Voltage Rating (DC)	32 V
Response Time	Fast Blow
Mounting Type	Through Hole
Package / Case	Axial
Breaking Capacity	50 A AC, 300 A DC
Operating Temperature Range	-55°C to 125°C
Size / Dimension	0.110" Dia x 0.280" L (2.80 mm x 7.11 mm)
DC Cold Resistance	0.0059 Ohms
Melting I²t	45.2
Approval Agencies	CSA, cURus
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution of the 0251012.MAT1L is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part 0251012.NAT1L maintains identical specifications across the following key parameters:

Current Rating: 12 A
Voltage Rating: 32 V AC and 32 V DC
Response Time: Fast Blow
Mounting Type: Through Hole
Package / Case: Axial
Breaking Capacity: 50 A AC, 300 A DC
Melting I²t: 45.2
Operating Temperature Range: -55°C to 125°C
Physical Dimensions: 0.110" Dia x 0.280" L (2.80 mm x 7.11 mm)
DC Cold Resistance: 0.0059 Ohms
Approval Agencies: CSA, cURus
RoHS Status: ROHS3 Compliant

The only difference between these parts is the packaging format: the main part is supplied in Tape & Box (TB) configuration, while the substitute is supplied in Cut Tape (CT) configuration. Both are manufactured by Littelfuse Inc. and belong to the same PICO® II 251 series.

Parameter Comparison

Parameter	0251012.MAT1L (Main)	0251012.NAT1L (Substitute)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.
Series	PICO® II 251	PICO® II 251
Current Rating (Amps)	12 A	12 A
Voltage Rating - AC	32 V	32 V
Voltage Rating - DC	32 V	32 V
Response Time	Fast Blow	Fast Blow
Mounting Type	Through Hole	Through Hole
Package / Case	Axial	Axial
Breaking Capacity @ Rated Voltage	50 A AC, 300 A DC	50 A AC, 300 A DC
Melting I²t	45.2	45.2
Approval Agency	CSA, cURus	CSA, cURus
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C
Size / Dimension	0.110" Dia x 0.280" L (2.80 mm x 7.11 mm)	0.110" Dia x 0.280" L (2.80 mm x 7.11 mm)
DC Cold Resistance	0.0059 Ohms	0.0059 Ohms
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active
Packaging Format	Tape & Box (TB)	Cut Tape (CT)

Engineering Selection Recommendations

Both the 0251012.MAT1L and 0251012.NAT1L are active products manufactured by Littelfuse Inc. and carry identical electrical and mechanical specifications. Selection between these parts should be based on packaging requirements and inventory availability.

The 0251012.MAT1L in Tape & Box format is suitable for applications requiring bulk packaging with protective boxing. The 0251012.NAT1L in Cut Tape format is appropriate for automated assembly processes and applications where individual component access is prioritized.

Both parts maintain full compliance with CSA and cURus certifications and meet ROHS3 requirements, ensuring regulatory compliance across standard industrial applications. The identical electrical characteristics, breaking capacity, and thermal operating range guarantee functional interchangeability in circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can 0251012.NAT1L be used as a direct replacement for 0251012.MAT1L?

A: Yes. Both parts are electrically and mechanically identical. The only difference is packaging format (Tape & Box versus Cut Tape). Functional performance in the circuit is identical.

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

A: Tape & Box packaging includes protective boxing around the tape reel, suitable for storage and manual handling. Cut Tape packaging provides individual components on tape without boxing, optimized for automated pick-and-place assembly equipment.

Q: Are both parts certified by the same approval agencies?

A: Yes. Both 0251012.MAT1L and 0251012.NAT1L carry CSA and cURus certifications and are ROHS3 compliant.

Q: Do these fuses have the same breaking capacity?

A: Yes. Both parts have identical breaking capacity ratings of 50 A AC and 300 A DC at rated voltage.

Q: What is the operating temperature range for these fuses?

A: Both parts operate reliably across -55°C to 125°C, suitable for industrial and commercial applications.

Q: Are the physical dimensions identical?

A: Yes. Both parts have identical axial dimensions of 0.110" diameter by 0.280" length (2.80 mm x 7.11 mm).

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