Equivalent & Substitute Parts for 066401.6HXLL

Part Overview

The Littelfuse 066401.6HXLL is a 1.6 A, 250 V AC/DC board mount fuse with slow blow response characteristics, designed for through-hole radial mounting in vertical orientation. This component belongs to the LT-5™ 664 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

066401.6HXLL

Littelfuse Inc.In Stock: 1218066401.6HXLL Datasheet

Current PartRFQ

38211600000

Littelfuse Inc.In Stock: 427738211600000 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The substitute part 38211600000 (Littelfuse TR5® 382 series) qualifies as a direct functional equivalent based on the following critical parameters:

• Current Rating: Both parts are rated at 1.6 A
• Voltage Rating: Both parts are rated at 250 V AC
• Response Time: Both parts feature slow blow characteristics
• Mounting Type: Both are through-hole mounted
• Fuse Type: Both are board mount types (cartridge style excluded)
• Package / Case: Both use radial, can, vertical configuration
• Breaking Capacity: Both are rated at 100 A @ rated voltage
• Operating Temperature: Both operate across -40°C to 85°C
• RoHS Compliance: Both are ROHS3 compliant

The substitute part represents an active product with improved availability and current manufacturing status, making it suitable for direct replacement in applications requiring the specified electrical and mechanical characteristics.

Parameter Comparison

Engineering Selection Recommendations

The 38211600000 substitute part is suitable for applications currently using the 066401.6HXLL. Selection is based on:

• Product Status Alignment: The substitute is an active product with current manufacturing support, addressing the obsolescence of the original part
• Electrical Equivalence: Identical current and voltage ratings ensure functional compatibility in the circuit
• Mechanical Compatibility: Radial, can, vertical package configuration and through-hole mounting are identical, supporting direct PCB placement without layout modifications
• Regulatory Compliance: Both parts maintain ROHS3 compliance and are approved by equivalent certification agencies (CCC, CSA, KTL, METI, SEMKO, UL, VDE for the original; CCC, cURus, KC, PSE/JET, SEMKO, VDE for the substitute)
• Thermal Performance: Operating temperature range is identical across both parts

Minor dimensional variation (0.333" H vs. 0.315" H) and resistance differences (0.06 Ohms vs. 0.0377 Ohms) do not affect functional substitution in standard board mount applications.

Frequently Asked Questions (FAQ)

Q: Can 38211600000 be used as a direct replacement for 066401.6HXLL?

A: Yes. Both parts share identical current rating (1.6 A), voltage rating (250 V AC), response time (slow blow), mounting type (through hole), and package configuration (radial, can, vertical). The substitute is electrically and mechanically compatible.

Q: What is the primary reason for substitution?

A: The original part 066401.6HXLL is classified as obsolete. The substitute 38211600000 is an active product with current manufacturing availability.

Q: Are there dimensional differences between the parts?

A: Yes. The main part measures 0.335" Dia x 0.333" H (8.50mm x 8.45mm), while the substitute measures 0.335" Dia x 0.315" H (8.50mm x 8.00mm). The diameter is identical; the height difference is 0.018" (0.45mm). This minor variation does not affect through-hole PCB mounting.

Q: Do the resistance and I²t values differ?

A: Yes. The main part has 0.06 Ohms DC cold resistance and 10 melting I²t, while the substitute has 0.0377 Ohms and 12.67 melting I²t. These differences reflect design improvements in the active TR5® 382 series and do not compromise functional substitution in standard applications.

Q: Are regulatory certifications equivalent?

A: Both parts are ROHS3 compliant and hold multiple international certifications. The substitute carries certifications from CCC, cURus, KC, PSE/JET, SEMKO, and VDE, providing equivalent regulatory coverage for global applications.

Q: What packaging is available for the substitute?

A: The substitute 38211600000 is available in Cut Tape (CT) packaging, with 4179 pieces in current stock.