Littelfuse 0316005.NRT1 Equivalent & Substitute Parts

Part Overview

The Littelfuse 0316005.NRT1 is a 5A 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 PICO® II 251 series provides direct functional equivalents with enhanced specifications and active product status.

Key Parameters

Parameter	Value
Current Rating	5 A
Voltage Rating (AC)	125 V
Voltage Rating (DC)	125 V
Response Time	Fast Blow
Fuse Type	Board Mount (Cartridge Style Excluded)
Mounting Type	Through Hole
Package / Case	Axial
Size / Dimension	0.110" Dia x 0.280" L (2.80mm x 7.11mm)
Breaking Capacity @ Rated Voltage	50A
Melting I²t	4.14
Operating Temperature Range	-55°C ~ 125°C
DC Cold Resistance	0.0155 Ohms
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 0316005.NRT1 is based on strict electrical and mechanical parameter matching:

Electrical Parameters (Critical):

Current Rating: 5 A (exact match required)
Voltage Rating AC: 125 V (exact match required)
Voltage Rating DC: 125 V (exact match required)
Response Time: Fast Blow (exact match required)
Melting I²t: 4.14 (exact match required)

Mechanical Parameters (Critical):

Fuse Type: Board Mount (Cartridge Style Excluded)
Mounting Type: Through Hole
Package / Case: Axial
Size / Dimension: 0.110" Dia x 0.280" L (2.80mm x 7.11mm)

Environmental & Compliance Parameters:

Operating Temperature Range: -55°C ~ 125°C
RoHS Status: ROHS3 Compliant

All substitute parts listed below meet these exact specifications. The primary difference between the main part and substitutes is product status (obsolete vs. active) and packaging format (bulk vs. cut tape vs. tape & reel).

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Current Rating (A)	Voltage AC (V)	Voltage DC (V)	Response Time	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Packaging	Inventory (Pcs)
0316005.NRT1	Littelfuse Inc.	PICO® II 316	Obsolete	5	125	125	Fast Blow	50A	4.14	0.0155	Bulk	913
0251005.MRT1L	Littelfuse Inc.	PICO® II 251	Active	5	125	125	Fast Blow	50A AC, 300A DC	4.14	0.0158	Cut Tape (CT)	5271
0251005.NRT1L	Littelfuse Inc.	PICO® II 251	Active	5	125	125	Fast Blow	50A AC, 300A DC	4.14	0.0158	Cut Tape (CT)	185000
0251005.HAT1L	Littelfuse Inc.	PICO® II 251	Active	5	125	125	Fast Blow	50A AC, 300A DC	4.14	0.0158	Cut Tape (CT)	3370
0251005.MAT1L	Littelfuse Inc.	PICO® II 251	Active	5	125	125	Fast Blow	50A AC, 300A DC	4.14	0.0158	Cut Tape (CT)	1930
0251005.NAT1L	Littelfuse Inc.	PICO® II 251	Active	5	125	125	Fast Blow	50A AC, 300A DC	4.14	0.0158	Cut Tape (CT)	1516
0251005.PARL	Littelfuse Inc.	PICO® II 251	Active	5	125	125	Fast Blow	50A AC, 300A DC	4.14	0.0158	Tape & Reel (TR)	1022

Engineering Selection Recommendations

Primary Recommendation: 0251005.NRT1L

The 0251005.NRT1L is the preferred substitute for the obsolete 0316005.NRT1. This part maintains electrical and mechanical equivalence while offering:

Active product status with long-term availability
Highest inventory level (185,000 pcs) ensuring supply continuity
Enhanced DC breaking capacity (300A DC vs. 50A DC)
Expanded approval certifications (CSA, cURus, PSE, TUV in addition to CCC)
Cut Tape packaging suitable for automated assembly processes

Alternative Recommendations by Packaging:

For tape & reel applications requiring automated high-volume assembly, select 0251005.PARL. This variant provides identical electrical specifications with Tape & Reel packaging format.

For cut tape applications with specific inventory requirements, 0251005.MRT1L, 0251005.HAT1L, and 0251005.MAT1L are functionally equivalent alternatives. Selection among these variants depends on packaging quantity and delivery schedule requirements.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and operating temperature range equivalence (-55°C ~ 125°C). The PICO® II 251 series substitutes include additional regulatory approvals (CSA, cURus, PSE, TUV) beyond the original part's CCC certification, providing enhanced global market acceptance.

Frequently Asked Questions (FAQ)

Q: Can 0251005.NRT1L directly replace 0316005.NRT1 in existing designs?

A: Yes. The 0251005.NRT1L maintains identical electrical ratings (5A, 125VAC/VDC, Fast Blow response), mechanical dimensions (0.110" Dia x 0.280" L), and mounting configuration (Through Hole Axial). Physical footprint and circuit board compatibility are preserved.

Q: What is the difference between the various 0251005 part numbers?

A: All 0251005 variants share identical electrical and mechanical specifications. The suffix designates packaging format and tape configuration: MRT1L, NRT1L, HAT1L, MAT1L use Cut Tape (CT) packaging; PARL uses Tape & Reel (TR) packaging. Selection depends on assembly process requirements and order quantity.

Q: Why does the substitute have higher DC breaking capacity (300A DC vs. 50A)?

A: The PICO® II 251 series represents an enhanced product generation with improved DC performance characteristics. This higher breaking capacity does not affect AC circuit operation and provides additional safety margin in DC applications.

Q: Are there any temperature or environmental differences?

A: No. Both the original 0316005.NRT1 and all substitute parts operate across the identical temperature range (-55°C ~ 125°C) and maintain ROHS3 compliance.

Q: Which substitute should be selected for high-volume production?

A: For automated assembly processes, 0251005.PARL (Tape & Reel format) is recommended. For manual or semi-automated assembly, any Cut Tape variant (0251005.NRT1L, 0251005.MRT1L, 0251005.HAT1L, 0251005.MAT1L) is suitable. The 0251005.NRT1L offers the largest inventory reserve (185,000 pcs).

Q: Are all substitutes RoHS compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance status, matching the original part's environmental certification.

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