Littelfuse 0232003.MXW Glass Cartridge Fuse 3A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0232003.MXW is a 3A 250VAC glass cartridge fuse with a 5mm x 20mm form factor, designed for applications requiring medium-blow response characteristics. This part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility. Substitute parts must match the core electrical parameters: 3A current rating, 250V AC voltage rating, medium-blow response, and 5x20mm package dimensions.

Key Parameters

Parameter	Value
Manufacturer Part Number	0232003.MXW
Manufacturer	Littelfuse Inc.
Current Rating	3 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Medium Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	100A
Operating Temperature Range	-55°C ~ 125°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the 0232003.MXW are grouped into two categories based on allowed electrical and mechanical parameters:

Category 1: Parametric Equivalents (Requires Holder Mounting) Parts that maintain identical electrical specifications and mounting requirements: 3A current rating, 250V AC voltage rating, medium-blow response, 5x20mm package, and requires-holder mounting type. These parts are direct functional replacements within the same mechanical interface.

Qualifying parts: 0232003.MXF19P, 0232003.MXF22P, 0232003.MXF34P, 0232003.MXP, 0234003.MXBP, 0234003.MXP, MSC-3A

Category 2: Manufacturer Recommended Alternative (Through Hole Mounting) Part 0232003.MXEP represents an active alternative with modified mounting characteristics (through-hole vs. requires-holder) and dimensional variation (5.80mm x 22.50mm vs. 5.20mm x 20.00mm). This part maintains electrical equivalence but requires mechanical redesign for integration.

Key parameters determining substitution eligibility:

Current Rating: 3A (mandatory match)
Voltage Rating: 250V AC (mandatory match)
Response Time: Medium Blow (mandatory match)
Fuse Type: Cartridge, Glass (mandatory match)
Breaking Capacity: 100A (mandatory match)
Operating Temperature: -55°C ~ 125°C (mandatory match)

Parameter Comparison

Part Number	Manufacturer	Current (A)	Voltage (V AC)	Response	Package	Mounting Type	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Product Status	RoHS Status
0232003.MXW	Littelfuse Inc.	3	250	Medium Blow	5x20mm	Requires Holder	100	17.65	0.0257	Obsolete	RoHS non-compliant
0232003.MXEP	Littelfuse Inc.	3	250	Medium Blow	5.80x22.50mm	Through Hole	100	17.19	0.0226	Active	ROHS3 Compliant
0232003.MXF19P	Littelfuse Inc.	3	250	Medium Blow	5x20mm	Requires Holder	100	17.19	0.0226	Active	ROHS3 Compliant
0232003.MXF22P	Littelfuse	3	250	Medium Blow	5x20mm	Requires Holder	100	17.19	0.0226	Active	ROHS3 Compliant
0232003.MXF34P	Littelfuse Inc.	3	250	Medium Blow	5x20mm	Requires Holder	100	17.19	0.0226	Active	ROHS3 Compliant
0232003.MXP	Littelfuse Inc.	3	250	Medium Blow	5x20mm	Requires Holder	100	17.19	0.0226	Active	ROHS3 Compliant
0234003.MXBP	Littelfuse Inc.	3	250	Medium Blow	5x20mm	Requires Holder	100	26.24	0.0431	Active	ROHS3 Compliant
0234003.MXP	Littelfuse Inc.	3	250	Medium Blow	5x20mm	Requires Holder	100	26.24	0.0431	Active	ROHS3 Compliant
MSC-3A	OptiFuse	3	250	Medium Blow	5x20mm	Requires Holder	100	15.5	N/A	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Mechanical Replacement (Requires Holder Mounting):

The following parts provide direct substitution with identical package dimensions and mounting interface:

0232003.MXP offers the highest inventory availability (8421 pcs) among Littelfuse parametric equivalents and maintains full electrical compatibility. All Littelfuse variants (0232003.MXF19P, 0232003.MXF22P, 0232003.MXF34P, 0232003.MXP) are ROHS3 compliant with active product status and CE/KC/PSE certifications.

0234003.MXBP and 0234003.MXP (Series 234) are functionally equivalent with higher melting I²t values (26.24 vs. 17.19) and expanded approval certifications including CSA, K-MARK, and UL. These parts are suitable for applications requiring broader regulatory compliance.

MSC-3A (OptiFuse) provides an alternative from a different manufacturer with cULus and UL 248 certifications and lower melting I²t (15.5). This part is suitable for applications where multi-source qualification is required.

For Mechanical Redesign (Through Hole Mounting):

0232003.MXEP is the manufacturer-recommended active alternative with through-hole mounting and modified dimensions (5.80mm x 22.50mm). This part requires PCB redesign but offers ROHS3 compliance and CE/KC/PSE certifications. Selection of this part is appropriate when board redesign is feasible and through-hole mounting is preferred.

Frequently Asked Questions (FAQ)

Q: Can 0232003.MXP be used as a direct replacement for 0232003.MXW?

A: Yes. Both parts share identical electrical specifications (3A, 250V AC, medium-blow response), package dimensions (5x20mm), and mounting type (requires holder). The primary difference is product status: 0232003.MXW is obsolete while 0232003.MXP is active with ROHS3 compliance and current certifications (CE, KC, PSE).

Q: What is the difference between Littelfuse Series 232 and Series 234 parts?

A: Series 232 parts (0232003.MXF19P, 0232003.MXF22P, 0232003.MXF34P, 0232003.MXP) and Series 234 parts (0234003.MXBP, 0234003.MXP) maintain identical electrical ratings and package dimensions. The primary difference is melting I²t: Series 232 has 17.19 while Series 234 has 26.24. Series 234 parts include expanded certifications (CSA, K-MARK, UL) in addition to CE and PSE.

Q: Can MSC-3A from OptiFuse be used interchangeably with Littelfuse parts?

A: Yes, for electrical and mechanical compatibility. MSC-3A matches all mandatory parameters: 3A current rating, 250V AC voltage, medium-blow response, 5x20mm package, and requires-holder mounting. MSC-3A carries cULus and UL 248 certifications. Substitution is appropriate when multi-source qualification or specific UL certification is required.

Q: What is the difference between 0232003.MXEP and other substitute parts?

A: 0232003.MXEP differs in mounting type (through-hole vs. requires-holder) and physical dimensions (5.80mm x 22.50mm vs. 5.20mm x 20.00mm). Electrical specifications remain equivalent. This part requires mechanical redesign for integration but is the manufacturer-recommended active alternative with current compliance certifications.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. The original 0232003.MXW is RoHS non-compliant. Compliance status is a key differentiator between the obsolete original part and active alternatives.

Q: Which substitute part has the highest inventory availability?

A: 0232003.MXP has the highest inventory with 8421 pcs in stock, followed by 0232003.MXF22P with 1143 pcs. Both are Littelfuse Series 232 parts with identical electrical and mechanical specifications.

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