Littelfuse 0662.500HXLL Equivalent & Substitute Parts

Part Overview

The Littelfuse 0662.500HXLL is a 500 mA, 250 V AC/DC board mount fuse with radial, can-style vertical packaging. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. The LT-5™ 662 series fuse has been superseded by newer product lines that maintain electrical and mechanical compatibility while offering improved availability and active product status.

Substiute Parts

0662.500HXLL

Littelfuse Inc.In Stock: 9810662.500HXLL Datasheet

Current PartRFQ

37005000000

Littelfuse Inc.In Stock: 309237005000000 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 0662.500HXLL is determined by strict equivalence across the following critical parameters:

• Current Rating: 500 mA (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package Style: Radial, Can, Vertical (exact match required)
• Breaking Capacity @ Rated Voltage: 35 A (exact match required)
• Regulatory Compliance: CSA, SEMKO, UL, VDE certifications (minimum required)
• RoHS Status: ROHS3 Compliant (exact match required)

The Littelfuse TR5® 370 series part number 37005000000 meets all substitution criteria. Both components share identical electrical ratings, mechanical form factors, and regulatory approvals, enabling direct functional replacement in board mount applications.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 37005000000 (TR5® 370 series) is the direct functional equivalent for the obsolete 0662.500HXLL. Selection of this substitute is based on:

• Product Status Alignment: The substitute maintains active product status, ensuring long-term availability and supply chain continuity.
• Electrical Equivalence: Identical current rating (500 mA), voltage rating (250 V AC), response time (Fast Blow), and breaking capacity (35 A) provide complete functional compatibility.
• Mechanical Compatibility: Radial, can-style vertical packaging with through-hole mounting enables direct board-level replacement without PCB redesign.
• Regulatory Compliance: Both components carry SEMKO and VDE certifications. The substitute adds CCC and cURus approvals while maintaining ROHS3 compliance.
• Physical Dimensions: Minimal height variation (0.333" vs. 0.315") presents no practical installation constraints in standard board mount applications.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 37005000000 be used as a direct replacement for the 0662.500HXLL?

A: Yes. Both components share identical electrical ratings (500 mA, 250 V AC), response time (Fast Blow), breaking capacity (35 A), and mechanical form factor (radial, can, vertical through-hole). Direct substitution is functionally equivalent.

Q: What is the significance of the product status change from Obsolete to Active?

A: The obsolete status of the 0662.500HXLL indicates discontinued manufacturing and limited availability. The active status of the 37005000000 ensures ongoing production, stable supply, and manufacturer support for new designs and field replacements.

Q: Are there dimensional differences between these parts?

A: The substitute has a slightly reduced height (0.315" vs. 0.333"), representing a 0.018" difference. This minor variation does not affect board-level mounting or electrical performance in standard applications.

Q: Do both parts carry the same regulatory certifications?

A: Both parts are ROHS3 compliant and carry SEMKO and VDE certifications. The substitute adds CCC and cURus approvals. The main part includes CSA certification. All certifications meet industry standards for board mount fuse applications.

Q: What is the difference in DC Cold Resistance between these parts?

A: The substitute exhibits slightly lower DC cold resistance (0.121 Ohms vs. 0.128 Ohms), representing a 5.5% reduction. This minor difference does not affect functional performance in typical circuit protection applications.

Q: Is the packaging format identical?

A: Both components use radial, can-style vertical packaging for through-hole board mounting. The substitute is available in Cut Tape (CT) packaging, while the main part uses standard packaging. This does not affect component functionality or installation.