Littelfuse 0662001.HXLL Equivalent & Substitute Parts

Part Overview

The Littelfuse 0662001.HXLL is a 1 A, 250 V AC/DC board mount fuse with radial, can-style vertical packaging designed for through-hole applications. This component belongs to the LT-5™ 662 series and is classified as obsolete. Due to its obsolete status, identifying functionally equivalent active alternatives is essential for ongoing design support, production continuity, and component sourcing.

Substiute Parts

0662001.HXLL

LittelfuseIn Stock: 11990662001.HXLL Datasheet

Current PartRFQ

37311000000

Littelfuse Inc.In Stock: 237437311000000 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0662001.HXLL is determined by the following critical parameters:

• Current Rating: Must be 1 A
• Voltage Rating (AC): Must be 250 V
• Fuse Type: Must be Board Mount (Cartridge Style Excluded)
• Mounting Type: Must be Through Hole
• Package / Case: Must be Radial, Can, Vertical
• Response Time: Must be Fast Blow

The Littelfuse 37311000000 (TR5® 373 series) meets all substitution criteria. This part is an active product with current manufacturing support, making it suitable for replacing the obsolete 0662001.HXLL in applications requiring identical electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 37311000000 is the manufacturer-recommended substitute for the obsolete 0662001.HXLL. Selection of this active alternative is justified by:

• Product Status: The 37311000000 is an active product with ongoing manufacturing support, ensuring long-term availability and supply chain stability.
• Electrical Equivalence: Both parts share identical current rating (1 A), voltage rating (250 V AC), response time (Fast Blow), and fuse type specifications.
• Mechanical Compatibility: Both components feature identical mounting type (Through Hole) and package style (Radial, Can, Vertical), with negligible dimensional variation (0.333" H vs. 0.315" H).
• Regulatory Compliance: The substitute part maintains ROHS3 compliance and holds CSA and cULus certifications, meeting the regulatory requirements of the original part.
• Enhanced Performance: The 37311000000 provides higher breaking capacity (50 A vs. 35 A) and lower melting I²t (0.125 vs. 0.33), offering improved protection characteristics in the same form factor.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 37311000000 be used as a direct replacement for the 0662001.HXLL?

A: Yes. Both parts meet identical electrical specifications (1 A, 250 V AC, Fast Blow response) and mechanical requirements (Through Hole, Radial Can, Vertical). The substitute is the manufacturer-recommended alternative for the obsolete part.

Q: What is the significance of the different melting I²t values?

A: The melting I²t parameter defines the thermal energy required to melt the fuse element. The 37311000000 has a lower melting I²t (0.125 vs. 0.33), indicating faster thermal response. This represents an improvement in protection characteristics while maintaining the same current and voltage ratings.

Q: Are there dimensional differences between these parts?

A: Both parts share the same diameter (0.335" / 8.50mm). The height differs slightly: 0.333" H (8.45mm) for the 0662001.HXLL versus 0.315" H (8.00mm) for the 37311000000. This minimal variation (0.018" / 0.45mm) does not affect through-hole board mount compatibility.

Q: What certifications does the substitute part hold?

A: The 37311000000 holds CSA and cULus certifications. The original part held CSA, SEMKO, UL, and VDE certifications. Both parts are ROHS3 compliant.

Q: Is the substitute part available in different packaging options?

A: The 37311000000 is supplied in Cut Tape (CT) packaging. Packaging specifications for the original 0662001.HXLL were not provided in the technical data.

Q: What is the operating temperature range of the substitute part?

A: The 37311000000 operates across -40°C to 85°C. Operating temperature specifications for the original part were not provided.