Littelfuse 0468001.WR Surface Mount Fuse 1A 63V Board Mount

Part Overview

The Littelfuse 0468001.WR is a 1 A, 63 V AC/DC surface mount board mount fuse in 1206 (3216 Metric) package configuration. This SlimLine™ 468 series fuse is designed for circuit protection in applications requiring slow blow response characteristics. The part is currently active in production with full inventory availability. Alternative part numbers exist due to packaging variations, manufacturer options, and enhanced performance specifications that may align with specific application requirements or supply chain considerations.

Key Parameters

Parameter	Value
Current Rating	1 A
Voltage Rating (AC)	63 V
Voltage Rating (DC)	63 V
Response Time	Slow Blow
Package / Case	1206 (3216 Metric)
Mounting Type	Surface Mount
Fuse Type	Board Mount (Cartridge Style Excluded)
Breaking Capacity @ Rated Voltage	50 A
Operating Temperature Range	-55°C ~ 90°C
RoHS Status	ROHS3 Compliant
Approval Agencies	CSA, UL

Substitute Part Grouping Explanation

Substitution eligibility for the 0468001.WR is determined by strict equivalence across the following critical parameters:

Current Rating: 1 A (exact match required)
Voltage Rating: 63 V AC and 63 V DC (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 1206 (3216 Metric) (exact match required)
Mounting Type: Surface Mount (exact match required)
Fuse Type: Board Mount (Cartridge Style Excluded) (exact match required)

The substitute parts listed below meet all these criteria. Variations in secondary parameters such as melting I²t, DC cold resistance, operating temperature range, and manufacturer certifications do not preclude substitution when the primary electrical and mechanical parameters are identical.

Parameter Comparison

Parameter	0468001.WR (Littelfuse)	0468001.NR (Littelfuse)	0468001.NRHF (Littelfuse)	0685T1000-01 (Bel Fuse)
Current Rating (Amps)	1 A	1 A	1 A	1 A
Voltage Rating - AC	63 V	63 V	63 V	63 V
Voltage Rating - DC	63 V	63 V	63 V	63 V
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	1206 (3216 Metric)	1206 (3216 Metric)	1206 (3216 Metric)	1206 (3216 Metric)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Fuse Type	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)
Breaking Capacity @ Rated Voltage	50 A	50 A	50 A	50 A
Melting I²t	0.127	0.127	0.127	0.12
Operating Temperature Range	-55°C ~ 90°C	-55°C ~ 90°C	-55°C ~ 90°C	-55°C ~ 125°C
DC Cold Resistance (Ohms)	0.0825	0.0825	0.0825	0.494
Approval Agency	CSA, UL	CSA, UL	CSA, UL	AEC-Q200, CE, cURus
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts maintain active production status and full ROHS3 compliance. Selection between 0468001.WR, 0468001.NR, and 0468001.NRHF should be based on packaging and inventory availability, as these Littelfuse parts are electrically and mechanically identical.

The Bel Fuse 0685T1000-01 represents an alternative from a different manufacturer with identical primary electrical and mechanical specifications. This part carries AEC-Q200 automotive qualification and supports an extended operating temperature range to 125°C, compared to 90°C for the Littelfuse variants. The DC cold resistance of 0685T1000-01 is higher (0.494 Ohms versus 0.0825 Ohms), which may be relevant in applications with stringent resistance requirements. Selection of this part should account for certification requirements and thermal operating conditions specific to the application.

Frequently Asked Questions (FAQ)

Q: Can 0468001.NR be used as a direct replacement for 0468001.WR?

A: Yes. Both parts are Littelfuse SlimLine™ 468 series fuses with identical electrical ratings (1 A, 63 V AC/DC), response time (Slow Blow), package (1206), and mounting configuration. The difference is packaging designation only.

Q: What is the difference between 0468001.NRHF and 0468001.NR?

A: Both parts are electrically and mechanically equivalent. The designation suffix indicates packaging or handling specification variations. Inventory availability differs significantly (105,560 units for NRHF versus 24,100 units for NR).

Q: Can the Bel Fuse 0685T1000-01 replace the Littelfuse 0468001.WR?

A: Yes, for applications where the primary electrical and mechanical parameters are the selection criteria. The 0685T1000-01 meets all core specifications: 1 A, 63 V AC/DC, Slow Blow response, 1206 package, and 50 A breaking capacity. However, the higher DC cold resistance (0.494 Ohms versus 0.0825 Ohms) and extended temperature rating (-55°C to 125°C) should be evaluated against application requirements.

Q: Are there any compliance differences between these parts?

A: The Littelfuse variants (0468001.WR, 0468001.NR, 0468001.NRHF) carry CSA and UL approvals. The Bel Fuse 0685T1000-01 carries AEC-Q200, CE, and cURus approvals. Application-specific compliance requirements should determine part selection.

Q: Does package size differ between these parts?

A: All parts use the 1206 (3216 Metric) package. Physical dimensions are nominally equivalent, with minor variations: Littelfuse parts measure 0.125" L × 0.060" W × 0.023" H; Bel Fuse measures 0.126" L × 0.062" W × 0.025" H. These differences are within standard manufacturing tolerances and do not affect PCB footprint compatibility.

Q: Which part should I select for high-temperature applications?

A: The Bel Fuse 0685T1000-01 supports operation to 125°C, compared to 90°C for Littelfuse variants. If application operating temperature exceeds 90°C, the 0685T1000-01 is the appropriate selection.

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