Littelfuse 0230.375HXSW Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0230.375HXSW 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 identification of active equivalent and substitute parts essential for ongoing system support and procurement planning. The 0230 series fuses in this current and voltage rating are available in multiple active variants that maintain electrical and mechanical compatibility while offering improved compliance status and expanded voltage ratings.

Key Parameters

Parameter	Value
Manufacturer	Littelfuse Inc.
Series	230
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)
Melting I²t	0.58
Breaking Capacity @ Rated Voltage	35A
Operating Temperature Range	-55°C ~ 125°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 0230.375HXSW is determined by strict equivalence across 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)
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 obsolete 0230.375HXSW and active substitutes is the addition of DC voltage rating (125 V DC) and enhanced compliance certifications (ROHS3, CE, REACH Unaffected) in the active variants.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage - AC	Voltage - DC	Response Time	Breaking Capacity (AC)	Melting I²t	Product Status	RoHS Status	Approvals
0230.375HXSW	Littelfuse Inc.	375 mA	250 V	—	Slow Blow	35A	0.58	Obsolete	RoHS non-compliant	CSA, UL
0230.375HXSP	Littelfuse Inc.	375 mA	250 V	125 V	Slow Blow	35A	0.58	Active	ROHS3 Compliant	CE, CSA, UL
0230.375HXP	Littelfuse Inc.	375 mA	250 V	125 V	Slow Blow	35A	0.58	Active	ROHS3 Compliant	CE, CSA, UL
0230.375MXP	Littelfuse Inc.	375 mA	250 V	125 V	Slow Blow	35A	0.58	Active	ROHS3 Compliant	CE, CSA, UL
0230.375MXSP	Littelfuse Inc.	375 mA	250 V	125 V	Slow Blow	35A	0.58	Active	ROHS3 Compliant	CE, CSA, UL
0230.375VXP	Littelfuse Inc.	375 mA	250 V	125 V	Slow Blow	35A	0.58	Active	ROHS3 Compliant	CE, CSA, UL
0230.375VXSP	Littelfuse Inc.	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 equivalence to the 0230.375HXSW across current rating, voltage rating, response time, and thermal characteristics. The transition from the obsolete 0230.375HXSW to active variants provides the following engineering advantages:

Compliance Enhancement: Active substitutes achieve ROHS3 compliance, addressing regulatory requirements for new designs and procurement cycles. The original part carries RoHS non-compliant status.

Expanded Voltage Rating: Active variants add 125 V DC rating capability, extending application flexibility without changing AC performance characteristics. This addition does not compromise AC-only applications.

Certification Expansion: Active parts include CE certification in addition to existing CSA and UL approvals, supporting broader market deployment and regulatory acceptance.

Product Availability: All substitute parts maintain active production status with documented inventory levels, ensuring supply chain continuity compared to the obsolete original part.

Selection among the active variants (0230.375HXSP, 0230.375HXP, 0230.375MXP, 0230.375MXSP, 0230.375VXP, 0230.375VXSP) is determined by packaging and internal construction specifications not differentiated in core electrical parameters. All variants are mechanically and electrically interchangeable for the 0230.375HXSW application.

Frequently Asked Questions (FAQ)

Q: Can the 0230.375HXSW be directly replaced with any of the listed substitute parts?

A: Yes. All substitute parts maintain identical electrical ratings (375 mA, 250 V AC), response time (slow blow), physical dimensions (0.177" Dia x 0.571" L), and thermal characteristics (melting I²t of 0.58). Mechanical mounting and electrical performance are fully compatible.

Q: What is the significance of the DC voltage rating (125 V) in the active substitutes?

A: The addition of 125 V DC rating in active variants extends the fuse's application range to circuits with DC components. For AC-only applications, this parameter does not affect performance. The AC rating of 250 V remains the controlling specification for AC circuits.

Q: Why is the 0230.375HXSW classified as obsolete?

A: Obsolete status indicates the part is no longer in active production. Active substitutes with equivalent electrical and mechanical specifications are available to support ongoing system requirements and new procurement.

Q: Are there differences in breaking capacity between the original and substitute parts?

A: The original 0230.375HXSW specifies 35A breaking capacity at rated voltage. Active substitutes specify 35A AC and 10kA DC breaking capacity. For AC applications at 250 V, the 35A specification is equivalent and applicable.

Q: What packaging options are available for the substitute parts?

A: All substitute parts are available in bulk packaging. Specific packaging configurations (tape and reel, tube, or other formats) should be confirmed with the supplier based on procurement volume and assembly requirements.

Q: Do all substitute parts have the same DC cold resistance?

A: Active substitute parts specify 1.1685 Ohms DC cold resistance. The original 0230.375HXSW does not provide this specification. For AC-only applications, DC cold resistance is not a controlling parameter.

Q: Which substitute part should be selected for new designs?

A: Any of the active variants (0230.375HXSP, 0230.375HXP, 0230.375MXP, 0230.375MXSP, 0230.375VXP, 0230.375VXSP) meets the electrical and mechanical requirements. Selection among variants is based on internal construction specifications and supplier availability. All variants provide ROHS3 compliance and expanded certifications suitable for current regulatory requirements.

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