Littelfuse 0665002.HXSL Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0665002.HXSL is a 2A 250VAC board mount fuse with radial, can-style vertical mounting. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The fuse is designed for through-hole PCB mounting applications requiring slow-blow response characteristics and operates across a temperature range of -40°C to 85°C.

Substiute Parts

0665002.HXSL

Littelfuse Inc.In Stock: 8560665002.HXSL Datasheet

Current PartRFQ

37412000410

Littelfuse Inc.In Stock: 177737412000410 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 0665002.HXSL is determined by strict equivalence across the following critical parameters:

• Current Rating: 2 A (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Radial, Can, Vertical (exact match required)
• Breaking Capacity: 50 A (exact match required)
• Operating Temperature Range: -40°C to 85°C (exact match required)
• RoHS Compliance: ROHS3 Compliant (exact match required)

The primary substitute identified is the Littelfuse 37412000410 (TR5® 374 series), which maintains all critical electrical and mechanical parameters while offering active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 37412000410 is the direct substitute for the obsolete 0665002.HXSL. Both components are manufactured by Littelfuse Inc. and maintain identical electrical specifications across current rating, voltage rating, response time, and breaking capacity. The substitute part carries active product status, ensuring long-term availability and supply chain continuity.

Regulatory compliance is maintained through CSA and cULus certifications on the substitute part, which supersede the original UL certification. Both parts are ROHS3 compliant and operate within the same temperature range. The minor dimensional variation (0.333" H vs. 0.315" H) and DC cold resistance difference (0.034 Ohms vs. 0.0395 Ohms) remain within acceptable engineering tolerances for board mount fuse applications and do not affect functional performance in standard circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can the 37412000410 be used as a direct replacement for the 0665002.HXSL in existing designs?

A: Yes. The 37412000410 maintains all critical electrical parameters including current rating, voltage rating, response time, and breaking capacity. The component is mechanically compatible with through-hole radial mounting on PCBs designed for the original part.

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

A: The substitute part is in active production status, ensuring reliable supply availability and manufacturer support. The original part is obsolete and may face supply constraints or discontinuation.

Q: Are there differences in regulatory approvals between the two parts?

A: Both parts carry CSA approval. The substitute carries cULus certification, which is equivalent to and supersedes the original UL certification. Both maintain ROHS3 compliance.

Q: Does the slight height difference (0.333" vs. 0.315") affect PCB compatibility?

A: No. The height difference of 0.018" (0.45mm) is within standard PCB design tolerances for through-hole components and does not affect functional performance or mechanical fit in standard applications.

Q: What is the significance of the DC cold resistance values?

A: The DC cold resistance values (0.034 Ohms vs. 0.0395 Ohms) are both within acceptable ranges for 2A fuses and do not impact circuit protection performance in standard applications.