Littelfuse 0316002.NAT1 Equivalent & Substitute Parts

Part Overview

The Littelfuse 0316002.NAT1 is a 2A 125VAC/VDC board mount axial fuse from the PICO® II 316 series. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part maintains fast-blow response characteristics with a 50A breaking capacity at rated voltage and operates across the -55°C to 125°C temperature range. Active equivalent models from the PICO® II 251 and PICO® II 491 series provide direct functional replacement while offering improved availability and expanded certification coverage.

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)
DC Cold Resistance	0.0473 Ohms
Melting I²t	0.405
Operating Temperature	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the obsolete 0316002.NAT1 is based on strict electrical and mechanical parameter matching. All substitute parts maintain identical specifications 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)
DC Cold Resistance: 0.0473 Ohms
Melting I²t: 0.405
Operating Temperature Range: -55°C ~ 125°C
RoHS3 Compliance

Substitute parts are grouped into two series families: PICO® II 251 (primary recommendation) and PICO® II 491 (alternative). Both series provide equivalent electrical performance with identical breaking capacity specifications at rated voltage. Differences exist only in packaging format (Cut Tape vs. Tape & Box) and approval agency certifications.

Parameter Comparison

Part Number	Series	Status	Current (A)	Voltage AC/DC (V)	Response	Breaking Capacity	Melting I²t	Packaging	Certifications
0316002.NAT1	PICO® II 316	Obsolete	2	125/125	Fast Blow	50A	0.405	Axial	CCC
0251002.NAT1L	PICO® II 251	Active	2	125/125	Fast Blow	50A AC, 300A DC	0.405	Cut Tape (CT)	CCC, CSA, cURus, PSE, TUV
0251002.HAT1L	PICO® II 251	Active	2	125/125	Fast Blow	50A AC, 300A DC	0.405	Cut Tape (CT)	CCC, CSA, cURus, PSE, TUV
0251002.MAT1L	PICO® II 251	Active	2	125/125	Fast Blow	50A AC, 300A DC	0.405	Cut Tape (CT)	CCC, CSA, cURus, PSE, TUV
0251002.NAT6L	PICO® II 251	Active	2	125/125	Fast Blow	50A AC, 300A DC	0.405	Tape & Box (TB)	CCC, CSA, cURus, PSE, TUV
0251002.PAT1L	PICO® II 251	Active	2	125/125	Fast Blow	50A AC, 300A DC	0.405	Tape & Box (TB)	CCC, CSA, cURus, PSE, TUV
0491002.MAT1	PICO® II 491	Active	2	125/125	Fast Blow	50A	0.405	Tape & Box (TB)	CSA, PSE, UL

Engineering Selection Recommendations

The PICO® II 251 series (0251002.NAT1L, 0251002.HAT1L, 0251002.MAT1L, 0251002.NAT6L, 0251002.PAT1L) represents the primary substitute option. All PICO® II 251 variants maintain active product status with expanded certification coverage including CCC, CSA, cURus, PSE, and TUV approvals. These parts provide enhanced DC breaking capacity (300A DC versus 50A) while maintaining identical AC specifications and all critical electrical parameters.

Selection between PICO® II 251 variants depends on packaging requirements. Cut Tape (CT) packaging is available through 0251002.NAT1L, 0251002.HAT1L, and 0251002.MAT1L. Tape & Box (TB) packaging is available through 0251002.NAT6L and 0251002.PAT1L. All PICO® II 251 parts are ROHS3 compliant with Not Applicable MSL rating.

The PICO® II 491 series (0491002.MAT1) provides an alternative substitute with identical electrical specifications and 50A breaking capacity matching the original part. This option carries CSA, PSE, and UL certifications. PICO® II 491 maintains MSL rating of 1 (Unlimited) consistent with the original 0316002.NAT1.

Frequently Asked Questions (FAQ)

Q: Can PICO® II 251 series parts directly replace the obsolete 0316002.NAT1?

A: Yes. All PICO® II 251 variants (0251002.NAT1L, 0251002.HAT1L, 0251002.MAT1L, 0251002.NAT6L, 0251002.PAT1L) maintain identical electrical specifications including 2A current rating, 125V AC/DC voltage rating, fast-blow response, and 0.405 melting I²t. Physical dimensions and mounting characteristics are identical. The primary difference is expanded certification coverage and improved DC breaking capacity (300A DC).

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

A: Cut Tape (CT) packaging is supplied on continuous tape suitable for automated pick-and-place assembly. Tape & Box (TB) packaging includes the same tape format with protective boxing for storage and handling. Both packaging formats contain identical electrical components. Selection depends on assembly process requirements and inventory management practices.

Q: Does the PICO® II 491 series offer equivalent performance?

A: Yes. The 0491002.MAT1 maintains all critical electrical parameters identical to the original part, including 2A current rating, 125V AC/DC voltage rating, fast-blow response, and 0.405 melting I²t. Breaking capacity is 50A, matching the original specification. Certification coverage differs (CSA, PSE, UL versus CCC). This option is suitable where these certifications satisfy application requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance. The original 0316002.NAT1 is also ROHS3 compliant.

Q: What certifications apply to each substitute series?

A: PICO® II 251 series carries CCC, CSA, cURus, PSE, and TUV certifications. PICO® II 491 series carries CSA, PSE, and UL certifications. Application requirements determine which certification set is appropriate for your design.

Q: Can I mix packaging formats in production?

A: Yes. All PICO® II 251 variants are electrically and mechanically identical. Packaging format selection depends on assembly equipment compatibility and supply chain logistics. Mixing formats is acceptable provided assembly processes accommodate both tape formats.

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