Equivalent & Substitute Parts for Littelfuse 0219.050MXAP Glass Fuse Cartridge

Part Overview

The Littelfuse 0219.050MXAP is a 50 mA, 250 V AC/DC slow-blow glass fuse cartridge in a 5mm x 20mm form factor. This component is classified as Active product status and is designed for applications requiring overcurrent protection in low-voltage circuits. Substitute parts become necessary due to inventory availability, supply chain considerations, or specific certification requirements for regional compliance.

Key Parameters

Parameter	Value
Current Rating	50 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Operating Temperature Range	-55°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 0219.050MXAP is determined by strict equivalence across the following parameters:

Current Rating: 50 mA (exact match required)
Voltage Rating: 250 V AC (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Mounting Type: Requires Holder (exact match required)
Operating Temperature Range: -55°C to 125°C (exact match required)

All substitute parts listed below meet these electrical and mechanical parameters. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agencies do not disqualify substitution eligibility when core parameters align.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Current Rating	Voltage Rating (AC)	Response Time	Package / Case	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Product Status
0219.050MXAP	Littelfuse Inc.	219XA	50 mA	250 V	Slow Blow	5mm x 20mm	150 A	0.017	21.292	Active
0218.050HXP	Littelfuse Inc.	218	50 mA	250 V	Slow Blow	5mm x 20mm	35 A	0.00692	23.3	Active
0218.050MXP	Littelfuse Inc.	218	50 mA	250 V	Slow Blow	5mm x 20mm	35 A	0.00692	23.3	Active
0034.3104	SCHURTER Inc.	FST 5x20	50 mA	250 V	Slow Blow	5mm x 20mm	35 A	0.0363	Not Specified	Active
0034.5604.11	SCHURTER Inc.	SMD-FST	50 mA	250 V	Slow Blow	5mm x 20mm	35 A	0.0363	Not Specified	Active
TSD-50MA	OptiFuse	TSD	50 mA	250 V	Slow Blow	5mm x 20mm	35 A	Not Specified	Not Specified	Active

Engineering Selection Recommendations

All substitute parts listed are classified as Active product status, indicating current availability and ongoing manufacturer support. Selection among equivalent parts should be based on the following factors:

Littelfuse 0218.050HXP and 0218.050MXP: Both are Littelfuse products within the 218 series. These parts carry expanded approval agency certifications including CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE, providing broader regional compliance coverage compared to the primary part.

SCHURTER 0034.3104 and 0034.5604.11: Both SCHURTER parts are certified by cURus and VDE. The 0034.3104 (FST 5x20 series) and 0034.5604.11 (SMD-FST series) provide alternatives from an established fuse manufacturer with strong European certification credentials.

OptiFuse TSD-50MA: This part represents an alternative manufacturer option within the TSD series. It carries ROHS3 compliance and is suitable for applications where manufacturer diversity is a procurement requirement.

Frequently Asked Questions (FAQ)

Q: Can I substitute the Littelfuse 0219.050MXAP with any of the listed parts?

A: Yes. All listed parts meet the core electrical and mechanical parameters: 50 mA current rating, 250 V AC voltage rating, slow-blow response time, 5mm x 20mm package, and -55°C to 125°C operating temperature range. Physical form factor and holder compatibility are identical.

Q: What is the difference between the 0219.050MXAP and the 0218.050MXP?

A: Both parts share identical electrical ratings and package dimensions. The primary differences are the series designation (219XA versus 218) and breaking capacity (150 A versus 35 A). The 0218.050MXP carries additional approval certifications including CCC, CSA, and K-MARK.

Q: Are SCHURTER and OptiFuse parts direct replacements?

A: Yes. The SCHURTER 0034.3104, 0034.5604.11, and OptiFuse TSD-50MA all meet the specified electrical and mechanical parameters. Certification differences reflect regional approval variations rather than functional incompatibility.

Q: Does the melting I²t value affect substitution eligibility?

A: Melting I²t is a secondary characteristic that reflects thermal response behavior. While variations exist among the listed parts (ranging from 0.00692 to 0.0363), all parts maintain the same 50 mA current rating and slow-blow response classification, confirming functional equivalence for the specified application.

Q: What certifications should I consider for my application?

A: Certification requirements depend on regional and application-specific standards. The Littelfuse 0218 series parts offer the broadest certification coverage (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE). SCHURTER parts provide cURus and VDE certifications suitable for European applications. Verify your specific regulatory requirements before final selection.

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