Littelfuse 0230.350MXSP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0230.350MXSP is a 350 mA, 250 V AC / 125 V DC glass cartridge fuse with slow-blow response characteristics, designed for through-hole mounting in non-standard axial configurations. This part is classified as obsolete, necessitating identification of active equivalent alternatives for ongoing design support and procurement continuity. Substitute parts maintain identical electrical and mechanical specifications while offering current product availability.

Key Parameters

Parameter	Value
Current Rating	350 mA
Voltage Rating (AC)	250 V
Voltage Rating (DC)	125 V
Response Time	Slow Blow
Fuse Type	Cartridge, Glass
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 AC, 10kA DC
Melting I²t	0.49
DC Cold Resistance	1.31 Ohms
Operating Temperature Range	-55°C ~ 125°C
Approval Agencies	CE, CSA, UL
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 0230.350MXSP are qualified based on strict parametric equivalence across all critical electrical and mechanical specifications. The substitution criteria are:

Current Rating: 350 mA (exact match required)
Voltage Rating AC: 250 V (exact match required)
Voltage Rating DC: 125 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)
Breaking Capacity @ Rated Voltage: 35A AC, 10kA DC (exact match required)
Melting I²t: 0.49 (exact match required)
DC Cold Resistance: 1.31 Ohms (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)
Approval Agencies: CE, CSA, UL (exact match required)
RoHS Status: ROHS3 Compliant (exact match required)

All identified substitutes meet these criteria and are classified as active products with current manufacturing status.

Parameter Comparison

Parameter	0230.350MXSP (Main)	0230.350HXP	0230.350MXP
Manufacturer	Littelfuse Inc.	Littelfuse	Littelfuse Inc.
Current Rating (Amps)	350 mA	350 mA	350 mA
Voltage Rating - AC	250 V	250 V	250 V
Voltage Rating - DC	125 V	125 V	125 V
Response Time	Slow Blow	Slow Blow	Slow Blow
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Cartridge, Non-Standard (Axial)	Cartridge, Non-Standard (Axial)	Cartridge, Non-Standard (Axial)
Size / Dimension	0.177" Dia x 0.571" L (4.50mm x 14.50mm)	0.177" Dia x 0.571" L (4.50mm x 14.50mm)	0.177" Dia x 0.571" L (4.50mm x 14.50mm)
Breaking Capacity @ Rated Voltage	35A AC, 10kA DC	35A AC, 10kA DC	35A AC, 10kA DC
Melting I²t	0.49	0.49	0.49
DC Cold Resistance	1.31 Ohms	1.31 Ohms	1.31 Ohms
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Approval Agency	CE, CSA, UL	CE, CSA, UL	CE, CSA, UL
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

Both 0230.350HXP and 0230.350MXP are direct parametric equivalents to the obsolete 0230.350MXSP. Selection between these active alternatives should be based on procurement availability and packaging requirements:

0230.350HXP: Active product status with 817 units in stock, bulk packaging
0230.350MXP: Active product status with 657 units in stock, bulk packaging

Both parts carry identical electrical specifications, mechanical dimensions, breaking capacity ratings, and regulatory certifications (CE, CSA, UL). Both maintain ROHS3 compliance. The choice between these substitutes depends on supply chain logistics and inventory requirements rather than technical performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can 0230.350HXP or 0230.350MXP be used as direct replacements for 0230.350MXSP?

A: Yes. Both parts are parametric equivalents with identical current ratings (350 mA), voltage ratings (250 V AC / 125 V DC), response time (slow blow), physical dimensions (0.177" Dia x 0.571" L), breaking capacity (35A AC, 10kA DC), and regulatory certifications. The primary difference is product status: the main part is obsolete while both substitutes are active.

Q: Are there any packaging differences between the substitute parts?

A: Both 0230.350HXP and 0230.350MXP are supplied in bulk packaging. The main part 0230.350MXSP packaging type was not specified in the available data. Confirm packaging requirements with your procurement department before finalizing part selection.

Q: Do the substitute parts meet the same regulatory and compliance standards?

A: Yes. All three parts carry identical approvals (CE, CSA, UL) and maintain ROHS3 compliance status. Operating temperature ranges are identical (-55°C ~ 125°C).

Q: What is the significance of the melting I²t value of 0.49?

A: The melting I²t value characterizes the thermal energy required to melt the fuse element and is a critical parameter for circuit protection coordination. All three parts share this identical value, ensuring equivalent protection characteristics in the circuit.

Q: Are there any differences in DC cold resistance between the parts?

A: No. All three parts maintain 1.31 Ohms DC cold resistance, ensuring identical electrical behavior during normal circuit operation.

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