Littelfuse 023702.5M Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 023702.5M is a 2.5 A, 125 V AC/DC glass cartridge fuse with a 5mm x 20mm form factor, designed for use in fuse holders. This part is classified as obsolete and has been superseded by active alternatives from Littelfuse's current product lines. Identifying equivalent substitute parts ensures continued availability and access to components with matching electrical and mechanical specifications for replacement and new design applications.

Key Parameters

Parameter	Value
Current Rating	2.5 A
Voltage Rating (AC)	125 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Medium Blow
Breaking Capacity @ Rated Voltage	10 kA
Mounting Type	Requires Holder
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the 023702.5M are qualified based on strict electrical and mechanical parameter matching:

Qualifying Parameters for Substitution:

Current Rating: 2.5 A (exact match required)
Voltage Rating (AC): 125 V (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Response Time: Medium Blow (exact match required)
Breaking Capacity @ Rated Voltage: 10 kA (exact match required)
Mounting Type: Requires Holder (exact match required)

All substitute parts listed below meet these criteria and are sourced from Littelfuse's active product series (232 and 233), ensuring current manufacturing support and availability.

Parameter Comparison

Parameter	023702.5M (Main)	023302.5MXP	023202.5MX125P	023302.5MXBP	023302.5MXF11P
Current Rating (Amps)	2.5 A	2.5 A	2.5 A	2.5 A	2.5 A
Voltage Rating - AC	125 V	125 V	125 V	125 V	125 V
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	10 kA	10 kA	10 kA	10 kA	10 kA
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	Not specified	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Approval Agency	CE, CSA, PSE, UL	CE, CSA, KC, PSE, UL	CE, KC, PSE	CE, CSA, KC, PSE, UL	CE, CSA, KC, PSE, UL

Engineering Selection Recommendations

All substitute parts are electrically and mechanically equivalent to the 023702.5M and are sourced from Littelfuse's active product portfolio. Selection among the four substitute options should be based on the following criteria:

023302.5MXP — Manufacturer-recommended primary substitute. Carries full approval agency certifications (CE, CSA, KC, PSE, UL) and ROHS3 compliance. Highest inventory availability (4084 pcs).

023302.5MXBP — Parametrically equivalent alternative from Series 233. Identical electrical specifications and approval certifications to 023302.5MXP. Suitable for applications requiring bulk packaging.

023302.5MXF11P — Parametrically equivalent alternative from Series 233. Identical electrical specifications and approval certifications to 023302.5MXP. Suitable for applications requiring specific packaging configurations.

023202.5MX125P — Parametrically equivalent alternative from Series 232. Carries CE, KC, and PSE certifications. Reduced approval agency coverage compared to Series 233 alternatives. Lower inventory availability (896 pcs).

All substitute parts are ROHS3 compliant and REACH unaffected, addressing environmental compliance requirements not met by the obsolete 023702.5M.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts interchangeably with the 023702.5M?

A: Yes. All substitute parts meet the identical electrical and mechanical specifications: 2.5 A, 125 V AC/DC, 5mm x 20mm glass cartridge fuse with medium blow response and 10 kA breaking capacity. Direct substitution is supported without circuit modification.

Q: What is the difference between the Series 233 and Series 232 substitutes?

A: Both series meet the required electrical parameters. Series 233 parts (023302.5MXP, 023302.5MXBP, 023302.5MXF11P) carry broader approval agency certifications including CSA and UL. Series 232 (023202.5MX125P) carries CE, KC, and PSE certifications. Selection depends on your application's regulatory requirements.

Q: Why is the 023702.5M classified as obsolete?

A: The 023702.5M is no longer in active production. Littelfuse has transitioned to Series 232 and 233 alternatives, which offer improved compliance (ROHS3), broader certifications, and defined operating temperature ranges.

Q: Are there any differences in physical dimensions between the main part and substitutes?

A: No. All parts share identical dimensions: 0.205" diameter x 0.787" length (5.20mm x 20.00mm). They are mechanically interchangeable in any fuse holder designed for 5mm x 20mm cartridge fuses.

Q: Which substitute should I select for new designs?

A: For new designs, 023302.5MXP is the manufacturer-recommended choice. It provides the broadest approval agency coverage (CE, CSA, KC, PSE, UL), ROHS3 compliance, and highest inventory availability.

Q: Do these substitutes require any changes to my fuse holder or circuit design?

A: No. All substitute parts are designed for use in standard 5mm x 20mm fuse holders. No holder modifications or circuit redesign is required.

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