Littelfuse 0429002.WRM Surface Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0429002.WRM is a 2A 63V AC/DC surface mount board fuse in 1206 (3216 Metric) package format, designed for fast-blow protection in compact electronic assemblies. This part operates across the temperature range of -55°C to 90°C and features unlimited moisture sensitivity rating (MSL 1).

The 0429002.WRM carries obsolete product status. Identifying functionally equivalent active alternatives is essential for ongoing production support, design refreshes, and supply chain continuity.

Substiute Parts

0429002.WRM

Littelfuse Inc.In Stock: 48750429002.WRM Datasheet

Current PartRFQ

0466002.NR

Littelfuse Inc.In Stock: 703300466002.NR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0429002.WRM is determined by strict alignment across the following electrical and mechanical parameters:

• Current Rating: 2 A (exact match required)
• Voltage Rating AC/DC: 63 V (exact match required)
• Response Time: Fast 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)
• Operating Temperature Range: -55°C ~ 90°C (minimum required)

The Littelfuse 0466002.NR (SlimLine™ 466 series) meets all mandatory substitution criteria. This part is currently in active production status and provides enhanced compliance certifications and improved physical characteristics.

Parameter Comparison

Engineering Selection Recommendations

The 0466002.NR is the qualified substitute for the obsolete 0429002.WRM based on the following factors:

Product Status: The 0466002.NR is in active production, ensuring long-term availability and supply chain stability compared to the obsolete 0429002.WRM.

Regulatory Compliance: The 0466002.NR achieves ROHS3 compliance and carries CSA and UL approvals, providing enhanced regulatory alignment for modern applications. The 0429002.WRM is RoHS non-compliant.

Physical Compatibility: Both parts share identical electrical ratings (2A, 63V AC/DC, Fast Blow) and package dimensions (1206 / 3216 Metric). The 0466002.NR features a reduced height profile (0.023" vs 0.045"), which may provide improved PCB layout flexibility in space-constrained designs.

Performance Specifications: The 0466002.NR provides documented breaking capacity (50A), melting I²t (0.2326), and DC cold resistance (0.031 Ohms), enabling precise circuit protection analysis.

Supply Availability: The 0466002.NR maintains significantly higher inventory levels (70,282 pcs vs 4,839 pcs), supporting production continuity and reducing lead time risk.

Frequently Asked Questions (FAQ)

Q: Can the 0466002.NR be used as a direct replacement for the 0429002.WRM in existing designs?

A: Yes. Both parts share identical electrical specifications (2A, 63V AC/DC, Fast Blow response) and package format (1206 / 3216 Metric). The reduced height of the 0466002.NR (0.023" vs 0.045") is physically compatible with standard 1206 footprints and may improve PCB assembly clearance.

Q: What are the key differences between these two parts?

A: The primary differences are product status (0466002.NR is active vs 0429002.WRM is obsolete), regulatory compliance (0466002.NR is ROHS3 compliant with CSA/UL approvals), and documented performance specifications (breaking capacity, melting I²t, and DC resistance are specified for 0466002.NR only).

Q: Are there any packaging considerations when switching to the 0466002.NR?

A: The 0466002.NR is supplied in Tape & Reel (TR) format, which is standard for high-volume surface mount assembly. Packaging format does not affect electrical or mechanical compatibility on the PCB.

Q: Does the height difference between these parts affect PCB design?

A: The 0466002.NR is thinner (0.023" vs 0.045"), which reduces overall assembly height. This is beneficial for space-constrained applications and does not create compatibility issues with standard 1206 footprints.

Q: What certifications does the 0466002.NR carry?

A: The 0466002.NR holds CSA and UL approvals and is ROHS3 compliant. The 0429002.WRM carries no specified approval agencies and is RoHS non-compliant.