Littelfuse 0429005.WRM Surface Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0429005.WRM is a 5A board mount surface mount fuse rated for 24V AC/DC operation in a 1206 (3216 Metric) package. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement continuity. The part operates across an industrial temperature range of -55°C to 90°C with fast-blow response characteristics typical of general-purpose circuit protection applications.

Substiute Parts

0429005.WRM

Littelfuse Inc.In Stock: 191420429005.WRM Datasheet

Current PartRFQ

0466005.NR

Littelfuse Inc.In Stock: 342030466005.NR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 0429005.WRM is determined by the following critical parameters:

• Current Rating: Must be 5 A to maintain circuit protection design intent
• Voltage Rating: Must support minimum 24V AC/DC operation; higher voltage ratings are acceptable as they provide enhanced safety margin
• Package / Case: Must be 1206 (3216 Metric) surface mount to ensure PCB footprint compatibility
• Mounting Type: Must be surface mount to match assembly process requirements
• Response Time: Fast-blow characteristic must be maintained for equivalent protection behavior
• Operating Temperature Range: Must support -55°C to 90°C minimum to match environmental specifications

The substitute part 0466005.NR meets all substitution criteria. It maintains identical current rating, package, mounting type, and response time while providing enhanced voltage rating (32V AC/DC versus 24V AC/DC) and improved product status (Active versus Obsolete).

Parameter Comparison

Engineering Selection Recommendations

The 0466005.NR is the direct substitute for the obsolete 0429005.WRM. Selection of this substitute is supported by the following factors:

• Product Status: The substitute is Active, ensuring long-term availability and manufacturing support compared to the obsolete main part
• Compliance: The 0466005.NR is ROHS3 compliant, meeting current regulatory requirements, whereas the main part is RoHS non-compliant
• Certifications: The substitute carries CSA and UL approvals, providing recognized safety agency validation
• Electrical Compatibility: The 32V rating provides a safety margin above the 24V requirement while maintaining identical current protection characteristics
• Physical Compatibility: Identical package dimensions and mounting type ensure direct PCB footprint compatibility

Frequently Asked Questions (FAQ)

Q: Can the 0466005.NR be used as a direct replacement for the 0429005.WRM?

A: Yes. The 0466005.NR is electrically and mechanically compatible. Both parts share identical current rating (5A), package (1206), mounting type (surface mount), and response time (fast-blow). The substitute's higher voltage rating (32V versus 24V) provides additional safety margin in 24V circuits.

Q: What is the difference in physical dimensions between these parts?

A: The main part measures 0.125" L x 0.060" W x 0.045" H. The substitute measures 0.125" L x 0.060" W x 0.023" H. The length and width are identical; the substitute is thinner (0.023" versus 0.045" height). Both fit the 1206 (3216 Metric) package specification and are compatible with standard 1206 PCB footprints.

Q: Why should I select the substitute over the main part?

A: The main part is obsolete with no guaranteed future availability. The substitute is an active product with established supply chains. Additionally, the substitute meets ROHS3 compliance and carries CSA/UL certifications, supporting modern design standards and regulatory requirements.

Q: Are there any electrical performance differences?

A: Both parts provide identical circuit protection at 5A with fast-blow response. The substitute includes specified electrical characteristics (Breaking Capacity: 50A, Melting I²t: 1.6, DC Cold Resistance: 0.011 Ohms) that define its protection performance. The main part does not provide these specifications.

Q: What packaging options are available for the substitute?

A: The 0466005.NR is supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes. The main part packaging format is not specified in available documentation.