Littelfuse 0230.375DRT1SW Equivalent & Substitute Parts

Part Overview

The Littelfuse 0230.375DRT1SW is a 375 mA, 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, making substitute parts necessary for new designs and ongoing production requirements. The 0230 series fuses are non-standard axial cartridge types with a 4.50mm diameter and 14.50mm length, rated for breaking capacity of 35A at rated voltage.

Key Parameters

Parameter	Value
Current Rating	375 mA
Voltage Rating - AC	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Mounting Type	Through Hole
Package / Case	Cartridge, Non-Standard (Axial)
Size / Dimension	0.177" Dia x 0.571" L (4.50mm x 14.50mm)
Breaking Capacity @ Rated Voltage	35A
Melting I²t	0.58
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitute parts for the 0230.375DRT1SW are qualified based on the following electrical and mechanical parameters:

Current Rating: 375 mA (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 / 4.50mm x 14.50mm (exact match required)
Breaking Capacity @ Rated Voltage: 35A AC minimum (exact match required)
Melting I²t: 0.58 (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)
Mounting Type: Through Hole, Axial (exact match required)

All substitute parts listed maintain identical electrical performance and physical form factor. The primary distinction between the main part and substitutes is product status (active vs. obsolete) and compliance certifications.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage AC	Voltage DC	Response Time	Breaking Capacity AC	Melting I²t	Product Status	RoHS Status	Certifications
0230.375DRT1SW	Littelfuse Inc.	375 mA	250 V	—	Slow Blow	35A	0.58	Obsolete	RoHS non-compliant	CSA, UL
0230.375DRT1SP	Littelfuse Inc.	375 mA	250 V	125 V	Slow Blow	35A	0.58	Active	ROHS3 Compliant	CE, CSA, UL
0230.375DRT1P	Littelfuse Inc.	375 mA	250 V	125 V	Slow Blow	35A	0.58	Active	ROHS3 Compliant	CE, CSA, UL
0230.375DRT2P	Littelfuse Inc.	375 mA	250 V	125 V	Slow Blow	35A	0.58	Active	ROHS3 Compliant	CE, CSA, UL
0230.375DRT2SP	Littelfuse Inc.	375 mA	250 V	125 V	Slow Blow	35A	0.58	Active	ROHS3 Compliant	CE, CSA, UL
0230.375DRT3P	Littelfuse Inc.	375 mA	250 V	125 V	Slow Blow	35A	0.58	Active	ROHS3 Compliant	CE, CSA, UL
0230.375DRT3SP	Littelfuse	375 mA	250 V	125 V	Slow Blow	35A	0.58	Active	ROHS3 Compliant	CE, CSA, UL

Engineering Selection Recommendations

All listed substitute parts maintain electrical and mechanical equivalence to the 0230.375DRT1SW. Selection among active alternatives should be based on the following factors:

Product Status: The 0230.375DRT1SW is obsolete. All substitute parts listed carry active product status, ensuring ongoing availability and manufacturer support.

Compliance & Certifications: The main part holds CSA and UL certifications with RoHS non-compliant status. All substitute parts are ROHS3 compliant and carry expanded certifications including CE, CSA, and UL, meeting current regulatory requirements for new designs and production.

DC Voltage Rating: The main part specifies AC voltage only (250 V AC). All substitute parts include DC voltage rating (125 V DC) with corresponding DC breaking capacity (10kA DC), providing enhanced application flexibility without compromising AC performance.

Packaging: The main part is supplied in standard packaging. Substitute parts 0230.375DRT1SP, 0230.375DRT1P, 0230.375DRT2P, 0230.375DRT2SP, 0230.375DRT3P, and 0230.375DRT3SP are available in Tape & Reel (TR) packaging, suitable for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 0230.375DRT1SW with any of the listed substitute parts?

A: Yes. All substitute parts maintain identical current rating (375 mA), AC voltage rating (250 V), fuse type (glass cartridge), response time (slow blow), physical dimensions (4.50mm x 14.50mm), breaking capacity (35A AC), and melting I²t (0.58). The electrical and mechanical performance in AC applications is equivalent.

Q: What is the difference between the main part and substitute parts?

A: The primary differences are product status (obsolete vs. active), RoHS compliance (non-compliant vs. ROHS3 compliant), and certifications (CSA/UL vs. CE/CSA/UL). Substitute parts also include DC voltage rating (125 V DC) and DC breaking capacity (10kA DC), which the main part does not specify.

Q: Are there packaging differences among the substitute parts?

A: All substitute parts are supplied in Tape & Reel (TR) packaging, suitable for automated assembly. The main part uses standard packaging. TR packaging is standard for high-volume production environments.

Q: Which substitute part should I select for new designs?

A: Any of the listed substitute parts are suitable for new designs. Selection may be based on inventory availability, packaging requirements, or specific application needs. All parts carry identical electrical specifications and current regulatory compliance.

Q: Is the DC voltage rating on substitute parts relevant if my application is AC-only?

A: No. For AC-only applications, the DC voltage rating does not affect performance. The AC specifications (250 V AC, 35A breaking capacity) remain the controlling parameters and are identical across all parts.

Q: Can I use these fuses in applications requiring both AC and DC operation?

A: Substitute parts rated for 250 V AC and 125 V DC with 10kA DC breaking capacity support dual-voltage applications. The main part specifies AC voltage only and should not be used in DC circuits.

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