Littelfuse 0230.375DRT1W Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0230.375DRT1W is a 375 mA, 250 V AC glass cartridge fuse with slow-blow response characteristics, designed for through-hole mounting in non-standard axial configuration. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs. The 0230 series fuses are approved by CSA and UL, meeting industrial safety standards for circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	375 mA
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Fuse Type	Cartridge, Glass
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
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitute parts for the 0230.375DRT1W are determined by strict equivalence in the following electrical and mechanical parameters:

Current Rating: 375 mA (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Response Time: Slow Blow (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Package / Case: Cartridge, Non-Standard (Axial) (exact match required)
Size / Dimension: 0.177" Dia x 0.571" L (4.50mm x 14.50mm) (exact match required)
Melting I²t: 0.58 (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)

All substitute parts listed below meet these criteria. The primary distinction between the main part and substitutes is product status (obsolete vs. active) and packaging configuration (bulk vs. tape & reel).

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage (AC)	Voltage (DC)	Response Time	Breaking Capacity (AC)	Melting I²t	Product Status	Packaging	RoHS Status	Approvals
0230.375DRT1W	Littelfuse Inc.	375 mA	250 V	—	Slow Blow	35A	0.58	Obsolete	Bulk	RoHS Non-Compliant	CSA, UL
0230.375DRT1P	Littelfuse Inc.	375 mA	250 V	125 V	Slow Blow	35A AC, 10kA DC	0.58	Active	Tape & Reel	ROHS3 Compliant	CE, CSA, UL
0230.375DRT1SP	Littelfuse Inc.	375 mA	250 V	125 V	Slow Blow	35A AC, 10kA DC	0.58	Active	Tape & Reel	ROHS3 Compliant	CE, CSA, UL
0230.375DRT2P	Littelfuse Inc.	375 mA	250 V	125 V	Slow Blow	35A AC, 10kA DC	0.58	Active	Tape & Reel	ROHS3 Compliant	CE, CSA, UL
0230.375DRT2SP	Littelfuse Inc.	375 mA	250 V	125 V	Slow Blow	35A AC, 10kA DC	0.58	Active	Tape & Reel	ROHS3 Compliant	CE, CSA, UL
0230.375DRT3P	Littelfuse Inc.	375 mA	250 V	125 V	Slow Blow	35A AC, 10kA DC	0.58	Active	Tape & Reel	ROHS3 Compliant	CE, CSA, UL
0230.375DRT3SP	Littelfuse Inc.	375 mA	250 V	125 V	Slow Blow	35A AC, 10kA DC	0.58	Active	Tape & Reel	ROHS3 Compliant	CE, CSA, UL

Engineering Selection Recommendations

All substitute parts listed maintain electrical and mechanical equivalence to the 0230.375DRT1W. The primary selection criteria are:

Product Status: The 0230.375DRT1W is obsolete. All substitute parts (0230.375DRT1P, 0230.375DRT1SP, 0230.375DRT2P, 0230.375DRT2SP, 0230.375DRT3P, 0230.375DRT3SP) are active products with ongoing manufacturer support.

Compliance: Substitute parts are ROHS3 compliant and carry CE certification in addition to CSA and UL approvals. The original part is RoHS non-compliant.

DC Voltage Rating: Substitute parts include a 125 V DC rating, providing expanded application flexibility beyond the AC-only specification of the original part.

Packaging: Substitute parts are supplied in tape & reel format, suitable for automated assembly processes. The original part is supplied in bulk packaging.

For new designs or system replacements, any of the active substitute parts provide equivalent circuit protection with improved compliance status and modern packaging options.

Frequently Asked Questions (FAQ)

Q: Can I use any of the substitute parts as a direct replacement for the 0230.375DRT1W?

A: Yes. All listed substitute parts are electrically and mechanically equivalent. They maintain the same 375 mA current rating, 250 V AC voltage rating, slow-blow response, and physical dimensions (0.177" Dia x 0.571" L). The primary differences are product status (active vs. obsolete), compliance certifications, and packaging format.

Q: What is the difference between the various substitute part numbers (1P, 1SP, 2P, 2SP, 3P, 3SP)?

A: The electrical and mechanical specifications are identical across all substitute parts. The suffix designations (1, 2, 3 and P, SP) indicate internal manufacturing or packaging variations within the Littelfuse 0230 series. All variants meet the same performance and safety standards.

Q: Does the addition of 125 V DC rating on substitute parts affect AC-only applications?

A: No. The 125 V DC rating is an additional capability that does not impact AC circuit protection performance. Substitute parts maintain full equivalence for 250 V AC applications.

Q: Are the substitute parts suitable for automated assembly?

A: Yes. Substitute parts are supplied in tape & reel packaging, which is standard for automated pick-and-place assembly processes. The original 0230.375DRT1W is supplied in bulk packaging.

Q: What compliance advantages do the substitute parts offer?

A: Substitute parts are ROHS3 compliant and include CE certification alongside CSA and UL approvals. The original part is RoHS non-compliant. For applications requiring environmental compliance or European market distribution, substitute parts are preferred.

Q: Can I mix the original part with substitute parts in the same circuit board assembly?

A: Yes, from an electrical standpoint. However, for manufacturing consistency and compliance documentation, using a single active part number across production runs is recommended.

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