Littelfuse 0218.100H Glass Cartridge Fuse 100mA 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0218.100H is a 100 mA, 250 V AC/DC glass cartridge fuse in 5mm x 20mm form factor, designed for circuit protection in applications requiring slow-blow response characteristics. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for direct replacement in existing designs and new production applications.

Key Parameters

Parameter	Value
Current Rating	100 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Slow Blow
Mounting Type	Requires Holder
Operating Temperature Range	-55°C to 125°C
Breaking Capacity @ Rated Voltage	35A (base specification)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters: current rating (100 mA), voltage rating (250 V AC), fuse type (cartridge glass), physical dimensions (5mm x 20mm), response time (slow blow), and mounting configuration (requires holder). All listed substitutes maintain these core specifications. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agencies are documented but do not preclude functional equivalence within the specified electrical and mechanical envelope.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage (AC)	Response Time	Package	Breaking Capacity @ Rated Voltage	Product Status	RoHS Status
0218.100H	Littelfuse Inc.	100 mA	250 V	Slow Blow	5mm x 20mm	35A	Obsolete	Non-compliant
0218.100HXP	Littelfuse Inc.	100 mA	250 V	Slow Blow	5mm x 20mm	35A	Active	ROHS3 Compliant
0218.100MXF4P	Littelfuse Inc.	100 mA	250 V	Slow Blow	5mm x 20mm	80A	Active	ROHS3 Compliant
0218.100MXP	Littelfuse Inc.	100 mA	250 V	Slow Blow	5mm x 20mm	35A	Active	ROHS3 Compliant
0218.100TXP	Littelfuse Inc.	100 mA	250 V	Slow Blow	5mm x 20mm	35A	Active	ROHS3 Compliant
0218.100VXP	Littelfuse Inc.	100 mA	250 V	Slow Blow	5mm x 20mm	35A	Active	ROHS3 Compliant
0219.100MXAP	Littelfuse Inc.	100 mA	250 V	Slow Blow	5mm x 20mm	150A	Active	ROHS3 Compliant
0239.100MXP	Littelfuse Inc.	100 mA	250 V	Slow Blow	5mm x 20mm	35A	Active	ROHS3 Compliant
BK/GDC-100MA	Eaton - Electronics Division	100 mA	250 V	Slow Blow	5mm x 20mm	35A	Active	ROHS3 Compliant
0034.5607.22	SCHURTER Inc.	100 mA	250 V	Slow Blow	5mm x 20mm	35A	Active	ROHS3 Compliant
5ST 100-R	Bel Fuse Inc.	100 mA	250 V	Slow Blow	5mm x 20mm	35A	Active	ROHS3 Compliant

Engineering Selection Recommendations

For direct replacement of the obsolete 0218.100H, the Littelfuse 0218.100HXP, 0218.100MXP, 0218.100TXP, and 0218.100VXP series provide active-status alternatives with identical electrical specifications and ROHS3 compliance. The 0218.100HXP maintains the closest parametric alignment with the original part.

For applications requiring enhanced breaking capacity, the 0219.100MXAP (150A breaking capacity) and 0218.100MXF4P (80A breaking capacity) are functionally equivalent while offering increased fault current handling. The 0219.100MXAP operates under the 219XA series designation.

Cross-manufacturer alternatives include the Eaton BK/GDC-100MA, SCHURTER 0034.5607.22, and Bel Fuse 5ST 100-R, all of which maintain the specified 100 mA, 250 V, 5mm x 20mm configuration with active product status and ROHS3 compliance. Selection among these alternatives should be based on supply chain availability, approval agency requirements specific to the application, and existing design qualification history.

Frequently Asked Questions (FAQ)

Q: Can the 0218.100H be directly replaced with any of the listed substitutes?

A: Yes. All listed substitutes maintain the critical electrical parameters: 100 mA current rating, 250 V AC voltage rating, slow-blow response, and 5mm x 20mm physical dimensions. Direct mechanical and electrical compatibility is established across all alternatives.

Q: What is the significance of the different breaking capacity ratings?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt at rated voltage. The base specification is 35A. The 0219.100MXAP (150A) and 0218.100MXF4P (80A) provide higher fault current ratings for applications with greater available short-circuit current. Selection should align with the actual fault current available in the circuit.

Q: Are there packaging differences among the substitutes?

A: Yes. Most substitutes are supplied in bulk packaging. The SCHURTER 0034.5607.22 is supplied in Tape & Reel (TR) format. Packaging selection depends on production volume and assembly process requirements.

Q: Why is the original 0218.100H marked as obsolete?

A: Obsolescence typically reflects manufacturer discontinuation. Active alternatives with identical specifications are available from Littelfuse and other manufacturers, ensuring continued design support and supply chain continuity.

Q: Do all substitutes carry the same regulatory approvals?

A: No. Approval agencies vary by part number. The original 0218.100H carries BSI, CSA, SEMKO, UL, and VDE approvals. Substitute parts carry different combinations of CCC, CE, CSA, K-MARK, SEMKO, UL, VDE, cULus, IMQ, and KC approvals. Application-specific regulatory requirements should determine final part selection.

Q: What is the difference between Littelfuse series 218, 219XA, and 239?

A: These represent different product series within the Littelfuse cartridge fuse portfolio. All maintain the specified 100 mA, 250 V, 5mm x 20mm configuration. Series designation reflects internal design variations, manufacturing processes, and approval certifications. Functional equivalence is maintained across series for the specified electrical envelope.

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