Littelfuse 023701.6M Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 023701.6M is a 1.6 A 125 V AC/DC glass cartridge fuse with a 5mm x 20mm form factor, rated for medium blow response. This part is classified as obsolete and requires a fuse holder for installation. Due to its obsolete status, equivalent substitute parts from the active Littelfuse 232 and 233 series are available to maintain circuit protection functionality in applications requiring identical electrical and mechanical specifications.

Key Parameters

Parameter	Specification
Current Rating	1.6 A
Voltage Rating (AC)	125 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Medium Blow
Breaking Capacity	10 kA @ Rated Voltage
Mounting Type	Requires Holder
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 023701.6M is determined by strict equivalence across the following critical parameters: current rating (1.6 A), AC voltage rating (125 V), fuse type (cartridge glass), physical dimensions (5mm x 20mm), response time (medium blow), and breaking capacity (10 kA). All substitute parts listed maintain these core electrical and mechanical specifications, ensuring direct functional replacement in existing fuse holder assemblies.

The substitute parts are grouped into two categories based on manufacturer recommendation and parametric equivalence:

Manufacturer Recommended Substitute: 023301.6MXP (Series 233) is the primary recommended replacement, offering active product status and comprehensive approval certifications.

Parametric Equivalents: 023201.6MX125P (Series 232), 023301.6MXBP (Series 233), and 023301.6MXF11P (Series 233) provide equivalent electrical performance and mechanical compatibility.

Parameter Comparison

Parameter	023701.6M (Main)	023301.6MXP	023201.6MX125P	023301.6MXBP	023301.6MXF11P
Current Rating (A)	1.6	1.6	1.6	1.6	1.6
Voltage Rating - AC (V)	125	125	125	125	125
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Package / Case	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm
Response Time	Medium Blow	Medium Blow	Medium Blow	Medium Blow	Medium Blow
Breaking Capacity @ Rated Voltage (kA)	10	10	10	10	10
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Operating Temperature Range	Not specified	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
DC Cold Resistance (Ohms)	Not specified	0.088	0.0537	0.088	0.088
Melting I²t	Not specified	6.14	6.96	6.14	6.14

Engineering Selection Recommendations

All substitute parts maintain electrical and mechanical compatibility with the 023701.6M through identical current rating, voltage rating, fuse type, physical dimensions, response time, and breaking capacity specifications.

023301.6MXP is the manufacturer-recommended primary substitute. It carries active product status, ROHS3 compliance, and comprehensive approval certifications including CE, CSA, KC, PSE, and UL. This part is suitable for new designs and ongoing production requiring RoHS compliance.

023201.6MX125P provides parametric equivalence with active product status and ROHS3 compliance. Approval certifications include CE, KC, and PSE. This part is suitable for applications where the specified certifications are sufficient.

023301.6MXBP and 023301.6MXF11P are parametric equivalents from the Series 233 family with active product status, ROHS3 compliance, and identical electrical characteristics to 023301.6MXP. Both carry CE, CSA, KC, PSE, and UL certifications and are suitable for direct replacement applications.

Frequently Asked Questions (FAQ)

Q: Can the 023701.6M be directly replaced with any of the listed substitute parts?

A: Yes. All substitute parts maintain identical current rating (1.6 A), AC voltage rating (125 V), fuse type (cartridge glass), physical dimensions (5mm x 20mm), response time (medium blow), and breaking capacity (10 kA). Direct mechanical and electrical compatibility is ensured in existing fuse holder assemblies.

Q: What is the primary difference between the substitute parts?

A: The substitute parts differ in series designation (232 vs. 233), DC cold resistance values, melting I²t characteristics, and approval certifications. 023301.6MXP is the manufacturer-recommended option. 023201.6MX125P offers an alternative with different resistance and thermal characteristics. 023301.6MXBP and 023301.6MXF11P are Series 233 variants with identical electrical performance to 023301.6MXP.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts are ROHS3 compliant, whereas the 023701.6M is RoHS non-compliant. This makes the substitutes suitable for applications requiring RoHS compliance.

Q: What certifications should I consider for my application?

A: 023301.6MXP, 023301.6MXBP, and 023301.6MXF11P carry CE, CSA, KC, PSE, and UL certifications. 023201.6MX125P carries CE, KC, and PSE certifications. Select based on your regional and application-specific certification requirements.

Q: Does the fuse holder remain compatible with all substitute parts?

A: Yes. All substitute parts maintain the 5mm x 20mm form factor and require a fuse holder for installation, identical to the 023701.6M. Existing fuse holder assemblies are compatible without modification.

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