Littelfuse 0664001.HXSL Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0664001.HXSL is a 1 A, 250 V AC/DC board mount fuse with radial, can, vertical package configuration. This part operates within the LT-5™ 664 series and is classified as obsolete. Due to its obsolete status, equivalent substitute parts from the active TR5® 382 series are available to maintain circuit protection functionality in applications requiring 1 A slow blow fuse protection at 250 V.

Substiute Parts

0664001.HXSL

Littelfuse Inc.In Stock: 10850664001.HXSL Datasheet

Current PartRFQ

38211000410

Littelfuse Inc.In Stock: 380438211000410 Datasheet

DirectRFQ

38211000000

Littelfuse Inc.In Stock: 2870838211000000 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete 0664001.HXSL is based on electrical and mechanical parameter alignment across the following criteria:

Critical Matching Parameters:

• Current Rating: 1 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Fuse Type: Board Mount, Cartridge Style Excluded (exact match required)
• Package / Case: Radial, Can, Vertical (exact match required)
• Breaking Capacity @ Rated Voltage: 100 A (exact match required)
• Operating Temperature Range: -40°C ~ 85°C (exact match required)

Acceptable Variation Parameters:

• Size / Dimension: Minor height variation (0.333" H vs. 0.315" H) within radial can package tolerance
• DC Cold Resistance: Variation from 0.123 Ohms to 0.0625 Ohms (both within acceptable fuse resistance specifications)
• Melting I²t: Variation from 4.4 to 4.85 (both within slow blow fuse thermal characteristics)

The substitute parts 38211000410 and 38211000000 satisfy all critical matching parameters and are classified as active products, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts 38211000410 and 38211000000 provide direct functional equivalence to the obsolete 0664001.HXSL. Selection between the two substitutes should be based on packaging and inventory requirements:

38211000000 (MFR Recommended): This part is the manufacturer-recommended substitute, available in Cut Tape (CT) packaging with the highest inventory level (28,679 pcs). It carries full regulatory approvals including CCC, cURus, KC, PSE/JET, SEMKO, and VDE certifications, ensuring compliance across global markets.

38211000410: Available in Bulk packaging with 3,773 pcs in stock. This substitute maintains identical electrical specifications and regulatory compliance, offering an alternative packaging option for high-volume applications.

Both parts are active products from the TR5® 382 series, ensuring sustained availability and supply chain reliability. The minor dimensional variation in height (0.315" vs. 0.333") remains within radial can package tolerance specifications and does not affect electrical performance or board mount compatibility.

Frequently Asked Questions (FAQ)

Q: Can 38211000410 and 38211000000 be used interchangeably with 0664001.HXSL?

A: Yes. Both substitute parts match all critical electrical parameters: 1 A current rating, 250 V AC voltage rating, slow blow response time, 100 A breaking capacity, and -40°C to 85°C operating temperature range. Both maintain identical mounting type (through hole) and package configuration (radial, can, vertical). The only differences are packaging format and minor height variation, which do not affect functional compatibility.

Q: What is the difference between the two substitute parts?

A: 38211000000 and 38211000410 are electrically identical. The primary differences are packaging (Cut Tape vs. Bulk) and inventory availability. 38211000000 is the manufacturer-recommended option with higher stock levels.

Q: Are there any regulatory compliance differences?

A: Both substitutes maintain RoHS3 compliance and carry regulatory approvals from CCC, SEMKO, and VDE. 38211000000 and 38211000410 include additional certifications (cURus, KC, PSE/JET) compared to the original part, providing broader global market compliance.

Q: Will the height difference (0.333" vs. 0.315") affect board layout?

A: No. The 0.018" height reduction remains within standard radial can package tolerance specifications and does not impact PCB footprint or component clearance requirements for through-hole mounted fuses.

Q: What is the difference in DC Cold Resistance between the original and substitute parts?

A: The original part has 0.123 Ohms while substitutes have 0.0625 Ohms. Both values are within acceptable fuse resistance specifications for 1 A slow blow fuses and do not affect circuit protection performance.