Littelfuse 0430002.WR Surface Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0430002.WR is a 2 A, 63 V AC/DC board mount surface mount fuse in 1206 (3216 Metric) package with slow blow response characteristics. This part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support and procurement continuity. The part features CSA and UL approval agencies and operates across a temperature range of -55°C to 90°C.

Key Parameters

Parameter	Value
Current Rating	2 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	35 A
Approval Agency	CSA, UL
Operating Temperature Range	-55°C ~ 90°C

Substitute Part Grouping Explanation

Substitute parts for the 0430002.WR are qualified based on the following electrical and mechanical parameters:

Current Rating: 2 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)

Two substitute parts meet these criteria: the Littelfuse 0468002.NR (SlimLine™ 468 series, active status) and the Bourns SF-1206S200-2 (SinglFuse™ SF-1206S series, active status).

Parameter Comparison

Parameter	0430002.WR (Main)	0468002.NR (Littelfuse)	SF-1206S200-2 (Bourns)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Bourns Inc.
Current Rating (Amps)	2 A	2 A	2 A
Voltage Rating - AC	63 V	63 V	Not specified
Voltage Rating - DC	63 V	63 V	63 V
Response Time	Slow Blow	Slow Blow	Slow Blow
Package / Case	1206 (3216 Metric)	1206 (3216 Metric)	1206 (3216 Metric)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Fuse Type	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)
Breaking Capacity @ Rated Voltage	35 A	35 A AC, 50 A DC	50 A
Melting I²t	0.494	0.506	0.339
Approval Agency	CSA, UL	CSA, UL	UL
Operating Temperature Range	-55°C ~ 90°C	-55°C ~ 90°C	-20°C ~ 105°C
DC Cold Resistance (Ohms)	0.039	0.0324	0.032
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active
Size / Dimension (mm)	3.18 x 1.52 x 1.14	3.18 x 1.52 x 0.58	3.10 x 1.55 x 0.60

Engineering Selection Recommendations

The Littelfuse 0468002.NR is the primary substitute for the obsolete 0430002.WR. Both parts are manufactured by Littelfuse, share identical electrical ratings (2 A, 63 V AC/DC, slow blow), and maintain the same 1206 package footprint. The 0468002.NR offers improved product status (active), ROHS3 compliance, and enhanced breaking capacity (50 A DC versus 35 A). The reduced profile height (0.58 mm versus 1.14 mm) provides design flexibility for space-constrained applications.

The Bourns SF-1206S200-2 serves as a cross-manufacturer alternative. It meets all critical electrical parameters and maintains the 1206 package standard. The SF-1206S200-2 provides ROHS3 compliance and UL approval. The extended operating temperature range (-20°C to 105°C) and lower melting I²t value (0.339) should be evaluated against specific application requirements. The slightly reduced physical dimensions (3.10 x 1.55 x 0.60 mm) are compatible with standard 1206 footprints.

Frequently Asked Questions (FAQ)

Q: Can the 0468002.NR directly replace the 0430002.WR in existing designs?

A: Yes. The 0468002.NR matches all critical electrical parameters: 2 A current rating, 63 V AC/DC voltage rating, slow blow response, and 1206 package. The reduced height (0.58 mm versus 1.14 mm) is compatible with standard 1206 PCB footprints. Verify board layout clearance if height-sensitive constraints exist.

Q: What are the key differences between the Littelfuse 0468002.NR and Bourns SF-1206S200-2?

A: Both parts meet the core electrical requirements. The 0468002.NR maintains identical voltage ratings and breaking capacity specifications to the original part. The SF-1206S200-2 offers a lower melting I²t value (0.339 versus 0.506) and extended operating temperature range (-20°C to 105°C). Manufacturer preference, supply chain availability, and application-specific thermal requirements should guide selection.

Q: Are there RoHS compliance considerations for substitution?

A: The original 0430002.WR is RoHS non-compliant. Both substitute parts (0468002.NR and SF-1206S200-2) are ROHS3 compliant. If RoHS compliance is a design requirement, either substitute is acceptable.

Q: Does the reduced height of the 0468002.NR affect PCB assembly?

A: The 0468002.NR height of 0.58 mm is within standard 1206 package tolerances and compatible with existing 1206 footprints. Verify solder reflow profiles and pick-and-place equipment settings to ensure proper placement and solder joint formation.

Q: What is the significance of the melting I²t parameter in fuse selection?

A: Melting I²t defines the thermal energy required to melt the fuse element. The 0468002.NR (0.506) and SF-1206S200-2 (0.339) show variation. The lower value in the Bourns part indicates faster thermal response. Application-specific inrush current profiles and circuit protection requirements should determine which value is appropriate.

Q: Are both substitute parts available in tape and reel packaging?

A: Yes. The 0468002.NR and SF-1206S200-2 are both available in Tape & Reel (TR) packaging, suitable for automated PCB assembly processes.

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