Littelfuse 0230.375DRT2W Equivalent & Substitute Parts

Part Overview

The Littelfuse 0230.375DRT2W 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, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for continued system support and procurement.

Key Parameters

Parameter	Value
Current Rating	375 mA
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)
Melting I²t	0.58
Operating Temperature	-55°C ~ 125°C
Breaking Capacity @ Rated Voltage	35A

Substitute Part Grouping Explanation

Substitute parts for the 0230.375DRT2W are qualified based on the following critical parameters that determine functional equivalence:

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)
Melting I²t: 0.58 (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)
Mounting Type: Through Hole (exact match required)

All substitute parts listed below meet these criteria and are classified as active products with current manufacturing status.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage (AC)	Voltage (DC)	Response Time	Breaking Capacity (AC)	Product Status	RoHS Status	Packaging
0230.375DRT2W	Littelfuse Inc.	375 mA	250 V	—	Slow Blow	35A	Obsolete	RoHS non-compliant	—
0230.375DRT2P	Littelfuse Inc.	375 mA	250 V	125 V	Slow Blow	35A	Active	ROHS3 Compliant	Tape & Reel (TR)
0230.375DRT1P	Littelfuse Inc.	375 mA	250 V	125 V	Slow Blow	35A	Active	ROHS3 Compliant	Tape & Reel (TR)
0230.375DRT1SP	Littelfuse Inc.	375 mA	250 V	125 V	Slow Blow	35A	Active	ROHS3 Compliant	Tape & Reel (TR)
0230.375DRT2SP	Littelfuse Inc.	375 mA	250 V	125 V	Slow Blow	35A	Active	ROHS3 Compliant	Tape & Reel (TR)
0230.375DRT3P	Littelfuse Inc.	375 mA	250 V	125 V	Slow Blow	35A	Active	ROHS3 Compliant	Tape & Reel (TR)
0230.375DRT3SP	Littelfuse Inc.	375 mA	250 V	125 V	Slow Blow	35A	Active	ROHS3 Compliant	Tape & Reel (TR)

Engineering Selection Recommendations

All substitute parts listed maintain identical AC voltage and current ratings with the obsolete 0230.375DRT2W. The primary distinctions are:

Product Status: The 0230.375DRT2W is obsolete. All substitute parts (0230.375DRT2P, 0230.375DRT1P, 0230.375DRT1SP, 0230.375DRT2SP, 0230.375DRT3P, 0230.375DRT3SP) are active products with current manufacturing support.

Regulatory Compliance: Substitute parts are ROHS3 compliant and carry CE, CSA, and UL approvals, compared to the main part's CSA and UL approvals only. Substitute parts include REACH Unaffected status.

DC Voltage Rating: Substitute parts include 125 V DC rating capability, providing extended application flexibility beyond the main part's AC-only specification.

Packaging: Substitute parts are supplied in Tape & Reel (TR) format, enabling automated assembly processes. The main part packaging format is not specified.

Electrical Performance: All parts share identical melting I²t (0.58), breaking capacity (35A AC), and DC cold resistance (1.1685 Ohms for substitute parts).

Selection among substitute parts should be based on procurement availability, packaging requirements, and supply chain lead times, as all parts are electrically and mechanically equivalent.

Frequently Asked Questions (FAQ)

Q: Can the 0230.375DRT2W be directly replaced 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 (cartridge, glass), response time (slow blow), physical dimensions (0.177" Dia x 0.571" L), and melting I²t (0.58). Direct substitution is supported for AC applications.

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

A: The 0230.375DRT2W is obsolete with no DC voltage rating specified. All substitute parts are active products with 125 V DC rating capability, ROHS3 compliance, and Tape & Reel packaging. AC electrical performance is identical.

Q: Are there differences between the various substitute part numbers?

A: All substitute parts (0230.375DRT2P, 0230.375DRT1P, 0230.375DRT1SP, 0230.375DRT2SP, 0230.375DRT3P, 0230.375DRT3SP) are parametrically equivalent. Differences exist only in internal manufacturing designations (P, SP, 1, 2, 3 suffixes) and do not affect electrical or mechanical performance. Selection should be based on availability and packaging format.

Q: What certifications do the substitute parts carry?

A: Substitute parts carry CE, CSA, and UL approvals with REACH Unaffected status. The main part carries CSA and UL approvals only.

Q: Is the Tape & Reel packaging compatible with my through-hole assembly process?

A: Tape & Reel packaging is standard for automated component placement and is compatible with through-hole mounting applications. Confirm with your assembly process specifications.

Q: Can substitute parts be used in DC applications?

A: Substitute parts are rated for 125 V DC operation. The main part has no DC rating specified. Confirm DC voltage requirements against the 125 V DC rating of substitute parts.

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