Littelfuse 023003.5DRT3SW Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 023003.5DRT3SW is a 3.5 A 250 V AC glass cartridge fuse with slow-blow response characteristics, designed for through-hole mounting in axial configuration. This part is classified as obsolete. Equivalent and substitute parts are necessary to maintain circuit protection functionality in applications where the original part is no longer available or where alternative packaging and compliance options are required.

Key Parameters

Parameter	Value
Current Rating	3.5 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	Cartridge, Non-Standard (Axial)
Mounting Type	Through Hole
Size / Dimension	0.177" Dia x 0.571" L (4.50mm x 14.50mm)
Operating Temperature Range	-55°C ~ 125°C
Melting I²t	110
DC Cold Resistance	0.031 Ohms

Substitute Part Grouping Explanation

Substitution of the 023003.5DRT3SW is determined by the following critical parameters:

Current Rating: 3.5 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Physical Dimensions: 0.177" Dia x 0.571" L (exact match required)
Mounting Type: Through Hole, Axial (exact match required)

All substitute parts listed maintain these core electrical and mechanical specifications. Differences exist in packaging format (Tape & Reel vs. Cut Tape), product status (Active vs. Obsolete), and regulatory compliance certifications. The 023003.5DRT3SW operates at 250 V AC only, while all substitute parts support both 250 V AC and 125 V DC operation, providing expanded application compatibility without compromising the primary 250 V AC specification.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage AC	Voltage DC	Response Time	Packaging	Product Status	Breaking Capacity (AC)	DC Cold Resistance	RoHS Status
023003.5DRT3SW	Littelfuse Inc.	3.5 A	250 V	—	Slow Blow	Axial	Obsolete	100 A	0.031 Ω	Non-compliant
023003.5DRT3SP	Littelfuse Inc.	3.5 A	250 V	125 V	Slow Blow	Tape & Reel	Active	100 A	0.0312 Ω	ROHS3 Compliant
023003.5DRT1P	Littelfuse Inc.	3.5 A	250 V	125 V	Slow Blow	Cut Tape	Active	100 A	0.0312 Ω	ROHS3 Compliant
023003.5DRT2P	Littelfuse Inc.	3.5 A	250 V	125 V	Slow Blow	Tape & Reel	Active	100 A	0.0312 Ω	ROHS3 Compliant
023003.5DRT2SP	Littelfuse Inc.	3.5 A	250 V	125 V	Slow Blow	Tape & Reel	Active	100 A	0.0312 Ω	ROHS3 Compliant
023003.5MRT1SSP	Littelfuse Inc.	3.5 A	250 V	125 V	Slow Blow	Tape & Reel	Active	100 A	0.0312 Ω	ROHS3 Compliant

Engineering Selection Recommendations

The 023003.5DRT3SW is obsolete and no longer in active production. All listed substitute parts are active products manufactured by Littelfuse Inc. and maintain identical electrical and mechanical specifications for the primary 250 V AC application.

For new designs and production applications, 023003.5DRT3SP, 023003.5DRT1P, 023003.5DRT2P, 023003.5DRT2SP, and 023003.5MRT1SSP are direct functional equivalents. All substitute parts are ROHS3 compliant and carry CE, CSA, PSE, and UL certifications, compared to the original part's CSA, METI, and UL certifications.

Packaging selection depends on procurement requirements: Tape & Reel (TR) packaging is suitable for automated assembly processes, while Cut Tape (CT) packaging accommodates lower-volume or manual assembly operations. All substitute parts support both 250 V AC and 125 V DC operation, providing compatibility with a broader range of circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can 023003.5DRT3SP, 023003.5DRT1P, 023003.5DRT2P, 023003.5DRT2SP, or 023003.5MRT1SSP be used as direct replacements for 023003.5DRT3SW?

A: Yes. All substitute parts maintain the same current rating (3.5 A), AC voltage rating (250 V), fuse type (glass cartridge), response time (slow blow), physical dimensions (0.177" Dia x 0.571" L), and mounting configuration (through-hole axial). The primary electrical specification for 250 V AC operation is preserved across all parts.

Q: What is the difference between the substitute parts?

A: The substitute parts differ in packaging format and product status. 023003.5DRT3SP, 023003.5DRT2P, 023003.5DRT2SP, and 023003.5MRT1SSP are supplied in Tape & Reel packaging, while 023003.5DRT1P is supplied in Cut Tape packaging. All substitute parts are active products with ROHS3 compliance and expanded DC voltage ratings (125 V DC).

Q: Does the addition of 125 V DC rating on substitute parts affect 250 V AC operation?

A: No. The 125 V DC rating is an additional capability that does not alter the 250 V AC performance characteristics. The fuse maintains identical response time, breaking capacity, and thermal characteristics for AC applications.

Q: Are all substitute parts certified to the same standards?

A: All substitute parts carry CE, CSA, PSE, and UL certifications. The original 023003.5DRT3SW carries CSA, METI, and UL certifications. Substitute parts provide equivalent or expanded regulatory approval coverage.

Q: Which substitute part should be selected for automated assembly?

A: For automated assembly processes, select parts supplied in Tape & Reel packaging: 023003.5DRT3SP, 023003.5DRT2P, 023003.5DRT2SP, or 023003.5MRT1SSP. For manual or lower-volume assembly, 023003.5DRT1P in Cut Tape packaging is appropriate.

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