Littelfuse 021801.6H Glass Cartridge Fuse 1.6A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 021801.6H is a 1.6A 250VAC glass cartridge fuse in 5x20mm form factor, classified as obsolete. This slow-blow fuse cartridge requires a holder for installation and is designed for AC/DC applications with a breaking capacity of 35A at rated voltage. Due to its obsolete product status, equivalent active alternatives are necessary for ongoing system maintenance and new designs requiring identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Current Rating	1.6 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Slow Blow
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35A
Operating Temperature Range	-55°C ~ 125°C
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)

Substitute Part Grouping Explanation

Substitution for the 021801.6H is determined by strict equivalence across the following critical parameters:

Current Rating: 1.6 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Response Time: Slow Blow (exact match required)
Mounting Type: Requires Holder (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)

All substitute parts listed maintain these core electrical and mechanical parameters. Variations in melting I²t, DC cold resistance, breaking capacity, and approval agencies do not affect functional substitution within the specified parameter set.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (A)	Voltage (V AC)	Package	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Product Status	RoHS Status
021801.6H	Littelfuse Inc.	218	1.6	250	5x20mm	Slow Blow	35	10.61	0.032	Obsolete	RoHS non-compliant
021301.6MXBP	Littelfuse Inc.	213	1.6	250	5x20mm	Slow Blow	35	44.2	0.0551	Active	ROHS3 Compliant
021301.6MXP	Littelfuse Inc.	213	1.6	250	5x20mm	Slow Blow	35	44.2	0.0551	Active	ROHS3 Compliant
021301.6TXP	Littelfuse Inc.	213	1.6	250	5x20mm	Slow Blow	35	44.2	0.0551	Active	ROHS3 Compliant
021801.6HXP	Littelfuse Inc.	218	1.6	250	5x20mm	Slow Blow	35	23.35	0.0336	Active	ROHS3 Compliant
021801.6MXBP	Littelfuse Inc.	218	1.6	250	5x20mm	Slow Blow	35	23.35	0.0336	Active	ROHS3 Compliant
021801.6MXP	Littelfuse Inc.	218	1.6	250	5x20mm	Slow Blow	35	23.35	0.0336	Active	ROHS3 Compliant
021801.6TXP	Littelfuse Inc.	218	1.6	250	5x20mm	Slow Blow	35	23.35	0.0336	Active	ROHS3 Compliant
021801.6VXP	Littelfuse Inc.	218	1.6	250	5x20mm	Slow Blow	35	23.35	0.0336	Active	ROHS3 Compliant
021901.6MXABP	Littelfuse Inc.	219XA	1.6	250	5x20mm	Slow Blow	150	44.2	0.0551	Active	ROHS3 Compliant
021901.6MXAF5P	Littelfuse Inc.	219XA	1.6	250	5x20mm	Slow Blow	150	44.2	0.0551	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain electrical and mechanical equivalence to the 021801.6H across the specified parameter set. Selection among active alternatives should be based on:

Product Status: All substitute parts carry Active product status, ensuring long-term availability and supply chain continuity compared to the obsolete 021801.6H.

RoHS Compliance: All substitute parts are ROHS3 compliant, meeting current environmental and regulatory requirements. The original 021801.6H is RoHS non-compliant.

Approval Agencies: Substitute parts from Series 218 (021801.6HXP, 021801.6MXBP, 021801.6MXP, 021801.6TXP, 021801.6VXP) carry certifications including CCC, CE, CSA, PSE, SEMKO, UL, and VDE. Series 213 parts (021301.6MXBP, 021301.6MXP, 021301.6TXP) include additional certifications such as CCC and PSE. Series 219XA parts (021901.6MXABP, 021901.6MXAF5P) provide the highest breaking capacity at 150A while maintaining all core electrical parameters.

Packaging: All substitute parts are available in Bulk packaging. Inventory levels range from 704 to 2757 pieces, supporting both immediate and sustained procurement needs.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 021801.6H with any of the listed substitute parts?

A: Yes. All listed substitute parts maintain identical current rating (1.6A), voltage rating (250V AC), fuse type (cartridge glass), package dimensions (5x20mm), response time (slow blow), and operating temperature range (-55°C to 125°C). Direct mechanical and electrical substitution is supported.

Q: What is the difference between Series 218, Series 213, and Series 219XA fuses?

A: Series 218 and Series 213 both maintain a 35A breaking capacity. Series 219XA provides enhanced breaking capacity at 150A. Melting I²t values differ: Series 218 variants show 23.35, Series 213 variants show 44.2, and Series 219XA variants show 44.2. These differences do not affect substitution within the specified parameter set.

Q: Why is the original 021801.6H marked as obsolete?

A: The 021801.6H is classified as obsolete due to product lifecycle management. Active equivalent alternatives are available with identical electrical and mechanical specifications and improved compliance status (ROHS3 compliant vs. RoHS non-compliant).

Q: Does the difference in DC cold resistance affect substitution?

A: DC cold resistance variations (ranging from 0.032 to 0.0551 Ohms across the part list) do not affect functional substitution for the specified application parameters. These values remain within acceptable tolerance for cartridge fuse operation.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts are supplied in Bulk packaging. The 021801.6H was supplied with "-" packaging designation. Bulk packaging is standard for all active alternatives.

Q: Which substitute part offers the best regulatory coverage?

A: Series 219XA parts (021901.6MXABP, 021901.6MXAF5P) carry certifications from CCC, CE, CSA, PSE, SEMKO, UL, and VDE, with the highest breaking capacity (150A). Series 218 variants provide comparable regulatory coverage with additional certifications including K-MARK and KC depending on specific part number.

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