Littelfuse 0446002.ZR Surface Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0446002.ZR is a 2A 350VAC/125VDC surface mount board fuse with fast-blow response characteristics, designed for SMD applications requiring compact form factor protection. This part is classified as obsolete, necessitating identification of active equivalent components to maintain design continuity and ensure supply chain availability for new production runs and field replacements.

Substiute Parts

0446002.ZR

Littelfuse Inc.In Stock: 8010446002.ZR Datasheet

Current PartRFQ

0446002.ZRP

Littelfuse Inc.In Stock: 17360446002.ZRP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0446002.ZR is determined by strict equivalence across the following critical parameters:

• Current Rating: 2 A (exact match required)
• Voltage Rating - AC: 350 V (exact match required)
• Voltage Rating - DC: 125 V (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Package / Case: 2-SMD, Gull Wing (exact match required)
• Breaking Capacity @ Rated Voltage: 100A AC, 50A DC (exact match required)
• Melting I²t: 2.8 (exact match required)
• Operating Temperature Range: -40°C ~ 125°C (exact match required)
• DC Cold Resistance: 0.056 Ohms (exact match required)

The substitute part 0446002.ZRP meets all electrical and mechanical parameters specified above, confirming direct functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

The 0446002.ZRP is the direct active equivalent for the obsolete 0446002.ZR. Both parts are manufactured by Littelfuse Inc. within the 446 series and maintain identical electrical and mechanical specifications across all critical parameters.

The primary distinction between these parts is product status and compliance posture. The 0446002.ZR is classified as obsolete and carries RoHS non-compliant status. The 0446002.ZRP is an active product with ROHS3 compliance certification and REACH unaffected status, making it suitable for current production environments subject to environmental regulations.

Both parts carry CSA and UL approvals. The 0446002.ZR additionally lists METI approval, while the 0446002.ZRP does not; however, this difference does not affect functional equivalence for standard applications.

For new designs and production runs, the 0446002.ZRP is the appropriate selection. For legacy system maintenance where the original 0446002.ZR specification is mandated, the 0446002.ZRP provides full functional compatibility with enhanced regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the 0446002.ZRP be used as a direct replacement for the 0446002.ZR in existing designs?

A: Yes. The 0446002.ZRP is electrically and mechanically identical to the 0446002.ZR across all specified parameters, including current rating, voltage ratings, response time, package configuration, and thermal characteristics. Direct substitution is supported without circuit modification.

Q: What is the difference between the 0446002.ZR and 0446002.ZRP part numbers?

A: The primary difference is product status and packaging configuration. The 0446002.ZR is obsolete; the 0446002.ZRP is active. The 0446002.ZRP is supplied in Cut Tape (CT) and Digi-Reel packaging, whereas the 0446002.ZR does not specify active packaging options. The 0446002.ZRP also carries ROHS3 compliance certification.

Q: Are there any thermal or electrical performance differences between these parts?

A: No. Both parts operate across the identical temperature range (-40°C ~ 125°C), maintain the same DC cold resistance (0.056 Ohms), and exhibit identical melting I²t characteristics (2.8). Electrical performance is equivalent.

Q: What certifications apply to the 0446002.ZRP?

A: The 0446002.ZRP carries CSA and UL approvals. It is ROHS3 compliant and REACH unaffected. The part is classified under ECCN EAR99 and HTSUS 8536.10.0040.

Q: Is the 2-SMD, Gull Wing package suitable for automated assembly?

A: Yes. The 2-SMD, Gull Wing package is a standard surface mount configuration compatible with pick-and-place equipment and reflow soldering processes. The 0.430" x 0.345" x 0.150" form factor accommodates standard SMD assembly workflows.

Q: What is the Moisture Sensitivity Level (MSL) for the 0446002.ZRP?

A: The MSL rating is 2 with a 1-year floor life. This indicates moderate moisture sensitivity requiring standard dry storage and handling procedures during manufacturing.