Littelfuse 0446005.ZR Surface Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0446005.ZR is a 5A, 350VAC/125VDC surface mount board fuse with fast-blow response characteristics. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design support and procurement. The part features a 2-SMD gull wing package configuration suitable for automated assembly processes.

Substiute Parts

0446005.ZR

Littelfuse Inc.In Stock: 8770446005.ZR Datasheet

Current PartRFQ

0446005.ZRP

Littelfuse Inc.In Stock: 78880446005.ZRP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0446005.ZR is determined by strict equivalence across the following electrical and mechanical parameters:

• Current rating: 5 A (exact match required)
• Voltage ratings: 350 VAC and 125 VDC (exact match required)
• Response time: Fast Blow (exact match required)
• Package configuration: 2-SMD, Gull Wing (exact match required)
• Physical dimensions: 10.92mm × 8.76mm × 3.81mm (exact match required)
• Breaking capacity: 100A AC / 50A DC (exact match required)
• Melting I²t: 25 (exact match required)

The substitute part 0446005.ZRP maintains identical electrical and mechanical specifications while differing in packaging format and product status classification.

Parameter Comparison

Engineering Selection Recommendations

The 0446005.ZRP is the direct parametric equivalent for the obsolete 0446005.ZR. Both parts share identical electrical performance characteristics and physical form factors, ensuring functional interchangeability in circuit applications.

Selection between these parts should be based on the following factors:

Product Status: The 0446005.ZRP maintains active production status, ensuring long-term availability and supply chain continuity. The 0446005.ZR is obsolete and subject to inventory depletion.

Regulatory Compliance: The 0446005.ZRP achieves ROHS3 compliance, meeting current environmental and regulatory requirements. The 0446005.ZR does not meet this standard.

Certification Scope: Both parts carry UL and CSA approvals. The 0446005.ZR includes METI certification; the 0446005.ZRP does not list this agency.

Packaging Considerations: The 0446005.ZRP is supplied in Tape & Reel format, optimized for high-volume automated assembly. Standard packaging of the 0446005.ZR may be preferred for low-volume or prototype applications where reel quantities exceed requirements.

Frequently Asked Questions (FAQ)

Q: Are the 0446005.ZR and 0446005.ZRP electrically identical?

A: Yes. Both parts are rated for 5A at 350VAC/125VDC with fast-blow response, identical breaking capacity (100A AC / 50A DC), and matching melting I²t values of 25. Electrical performance is equivalent.

Q: Can the 0446005.ZRP be used as a direct replacement for the 0446005.ZR?

A: Yes. The parts share identical physical dimensions (10.92mm × 8.76mm × 3.81mm), package configuration (2-SMD gull wing), and electrical specifications. PCB layout and assembly processes require no modification.

Q: What is the primary difference between these parts?

A: The 0446005.ZRP is the active production equivalent with ROHS3 compliance and Tape & Reel packaging. The 0446005.ZR is obsolete. For new designs and ongoing procurement, the 0446005.ZRP is the specified choice.

Q: Does the Tape & Reel packaging of the 0446005.ZRP affect compatibility?

A: No. Tape & Reel is a supply format for automated pick-and-place assembly. The component itself is identical. Standard packaging can be requested from distributors if required for low-volume applications.

Q: Are there any temperature or environmental differences between these parts?

A: No. Both parts operate across the identical temperature range of -40°C to 125°C with matching DC cold resistance of 0.018 Ohms.

Q: Which certifications apply to both parts?

A: Both parts carry CSA and UL approvals. The 0446005.ZR includes METI certification; this is not listed for the 0446005.ZRP.