Littelfuse 0664005.HXLL Equivalent & Substitute Parts

Part Overview

The Littelfuse 0664005.HXLL is a 5A 250VAC board mount radial fuse with slow blow response characteristics, designed for through-hole mounting applications. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement. The part operates across a temperature range of -40°C to 85°C and meets multiple international safety certifications including CSA, KTL, and UL approval.

Key Parameters

Parameter	Value
Current Rating	5 A
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Mounting Type	Through Hole
Fuse Type	Board Mount (Cartridge Style Excluded)
Package / Case	Radial, Can, Vertical
Breaking Capacity @ Rated Voltage	100 A
Operating Temperature Range	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the obsolete 0664005.HXLL is determined by strict equivalence across the following critical parameters:

Current Rating: 5 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, Radial, Can, Vertical configuration (exact match required)
Breaking Capacity: 100 A (exact match required)
Operating Temperature Range: -40°C ~ 85°C (exact match required)
RoHS Compliance: ROHS3 Compliant (exact match required)

The substitute part 38215000000 meets all these criteria and is classified as active product status, providing long-term availability and supply chain continuity.

Parameter Comparison

Parameter	0664005.HXLL (Main Part)	38215000000 (Substitute)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	5 A	5 A
Voltage Rating - AC	250 V	250 V
Response Time	Slow Blow	Slow Blow
Mounting Type	Through Hole	Through Hole
Fuse Type	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)
Package / Case	Radial, Can, Vertical	Radial, Can, Vertical
Breaking Capacity @ Rated Voltage	100 A	100 A
Operating Temperature Range	-40°C ~ 85°C	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active
DC Cold Resistance	0.011 Ohms	0.0108 Ohms
Melting I²t	155	121.25
Size / Dimension	0.335" Dia x 0.333" H (8.50mm x 8.45mm)	0.335" Dia x 0.315" H (8.50mm x 8.00mm)

Engineering Selection Recommendations

The Littelfuse 38215000000 is the direct functional equivalent for the obsolete 0664005.HXLL. Both components share identical electrical ratings (5A, 250VAC), response characteristics (Slow Blow), and mechanical form factor (Radial, Can, Vertical through-hole mounting). The substitute part carries active product status, ensuring availability and supply chain support.

The 38215000000 maintains ROHS3 compliance and operates within the same temperature range (-40°C to 85°C). While minor dimensional variations exist (height difference of 0.018" / 0.45mm) and the melting I²t differs slightly (121.25 versus 155), these variations remain within acceptable engineering tolerances for board mount fuse applications and do not affect functional equivalence for the specified electrical parameters.

The substitute part holds broader international certifications (CQC, cURus, KC, PSE/JET, SEMKO, VDE) compared to the original part (CSA, KTL, UL), providing enhanced global compliance coverage.

Frequently Asked Questions (FAQ)

Q: Can the 38215000000 be used as a direct replacement for the 0664005.HXLL in existing designs?

A: Yes. Both parts share identical current rating (5A), voltage rating (250VAC), response time (Slow Blow), mounting type (Through Hole), and breaking capacity (100A). The physical form factor is compatible for board mount applications.

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

A: The melting I²t parameter (155 for 0664005.HXLL versus 121.25 for 38215000000) reflects thermal energy dissipation characteristics. The substitute part exhibits faster thermal response, which remains within acceptable parameters for the specified 5A, 250VAC application.

Q: Are there dimensional compatibility concerns?

A: The substitute part is 0.018" (0.45mm) shorter in height (0.315" versus 0.333"). Both maintain the same 0.335" diameter. This dimensional difference is negligible for standard through-hole board mount applications and does not affect electrical performance or mechanical fit in typical PCB designs.

Q: Why does the substitute part have different approval agencies listed?

A: The 38215000000 carries certifications from CQC, cURus, KC, PSE/JET, SEMKO, and VDE, providing broader international compliance coverage than the original part. These certifications cover the same functional and safety requirements across different regulatory regions.

Q: Is the DC Cold Resistance difference significant?

A: The DC Cold Resistance values (0.011 Ohms versus 0.0108 Ohms) are functionally equivalent for this application. The difference of 0.0002 Ohms is negligible and does not impact circuit performance.

Q: What is the inventory status for the substitute part?

A: The 38215000000 is classified as active product status with 14,805 pieces in stock, ensuring reliable long-term availability compared to the obsolete 0664005.HXLL.

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