Littelfuse 066201.6HXLL Equivalent & Substitute Parts

Part Overview

The Littelfuse 066201.6HXLL is a 1.6 A 250 V AC/DC board mount fuse with fast blow response time, designed for through-hole radial mounting in vertical orientation. This part is classified as obsolete, making identification of active equivalent components essential for ongoing system support and new design implementations. The substitute part 37311600000 from the TR5® 373 series provides functional equivalence with improved availability and active product status.

Substiute Parts

066201.6HXLL

Littelfuse Inc.In Stock: 701066201.6HXLL Datasheet

Current PartRFQ

37311600000

Littelfuse Inc.In Stock: 96737311600000 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete 066201.6HXLL with the active 37311600000 is based on strict equivalence of the following critical parameters:

• Current Rating: Both parts rated at 1.6 A
• Voltage Rating (AC): Both parts rated at 250 V
• Response Time: Both parts classified as Fast Blow
• Mounting Type: Both parts are Through Hole mounted
• Package / Case: Both parts use Radial, Can, Vertical configuration
• Fuse Type: Both parts are Board Mount (Cartridge Style Excluded)
• RoHS Compliance: Both parts meet ROHS3 requirements

The 37311600000 represents the manufacturer's recommended successor within the TR5® 373 series, maintaining functional compatibility while offering improved breaking capacity and active product status.

Parameter Comparison

Engineering Selection Recommendations

The 37311600000 is the appropriate selection for applications currently using the obsolete 066201.6HXLL. Both parts maintain identical current and voltage ratings with matching response characteristics, ensuring functional compatibility in existing circuit designs.

The substitute part offers enhanced breaking capacity (50 A versus 35 A) and improved melting I²t characteristics (0.38 versus 0.94), providing superior performance margins. The active product status of the TR5® 373 series ensures long-term availability and supply chain continuity.

Both parts maintain ROHS3 compliance and carry relevant safety certifications. The 37311600000 holds CSA and cULus approvals, meeting regulatory requirements for board mount fuse applications. Physical dimensions are compatible with existing through-hole mounting footprints, with the substitute part featuring a slightly reduced height (8.00mm versus 8.45mm).

Frequently Asked Questions (FAQ)

Q: Can the 37311600000 be used as a direct replacement for the 066201.6HXLL?

A: Yes. Both parts share identical current ratings (1.6 A), voltage ratings (250 V AC), response time (Fast Blow), and mounting configuration (Through Hole, Radial, Can, Vertical). The substitute part is compatible with existing PCB layouts and circuit designs.

Q: What are the differences between these two fuses?

A: The primary differences are product status and performance characteristics. The 37311600000 is an active product with higher breaking capacity (50 A versus 35 A) and lower melting I²t (0.38 versus 0.94). Physical height differs slightly (8.00mm versus 8.45mm), though both fit standard through-hole mounting footprints.

Q: Are there packaging differences?

A: The 066201.6HXLL packaging information is not specified in available data. The 37311600000 is supplied in Tape & Box (TB) packaging format, standard for active production components.

Q: Do both parts meet the same safety standards?

A: Both parts are ROHS3 compliant. The 066201.6HXLL carries CSA, SEMKO, UL, and VDE approvals. The 37311600000 carries CSA and cULus approvals. Both meet regulatory requirements for board mount fuse applications.

Q: Why is the 066201.6HXLL obsolete?

A: The LT-5™ 662 series has been superseded by the TR5® 373 series. The 37311600000 represents the manufacturer's active equivalent with improved specifications and ongoing production support.