Littelfuse 021901.6M Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 021901.6M is a 1.6 A, 250 V AC/DC glass cartridge fuse in 5mm x 20mm form factor with slow-blow response characteristics. This part is classified as obsolete. Equivalent and substitute parts are available from the active Littelfuse product lines, specifically the Series 213 and Series 218 families, which maintain the same electrical ratings and mechanical dimensions while offering improved product status and compliance certifications.

Key Parameters

Parameter	Value
Current Rating	1.6 A
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Mounting Type	Requires Holder
Operating Temperature Range	-55°C to 125°C
Breaking Capacity @ Rated Voltage	150 A

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence in the following parameters:

Current Rating: 1.6 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (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 criteria. Variations in Breaking Capacity, Melting I²t, DC Cold Resistance, and approval agency certifications do not preclude substitution when the above parameters are identical.

Parameter Comparison

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

Engineering Selection Recommendations

All listed substitute parts are electrically and mechanically equivalent to the 021901.6M. Selection among substitutes should be based on the following criteria:

Product Status: All substitute parts carry Active product status, whereas the 021901.6M is Obsolete. Active parts ensure continued availability and manufacturer support.

RoHS Compliance: All substitute parts are ROHS3 Compliant. The original 021901.6M is RoHS non-compliant. For applications subject to RoHS directives or customer requirements, ROHS3-compliant substitutes are necessary.

Approval Certifications: The 021901.6M carries BSI, CCC, CSA, KTL, PSE, SEMKO, UR, and VDE approvals. Substitute parts carry overlapping certification sets. Series 218 and 219XA parts include UL certification in addition to other agencies. Series 213 parts include CE certification. Verify that the selected substitute meets all required certifications for your application.

Breaking Capacity Consideration: The original 021901.6M has a Breaking Capacity of 150 A. Series 213 and Series 218 substitutes have a Breaking Capacity of 35 A. Series 219XA substitutes (021901.6MXABP and 021901.6MXAF5P) maintain the 150 A Breaking Capacity. For applications requiring 150 A Breaking Capacity, select from the 219XA series.

Melting I²t and DC Cold Resistance: These parameters vary among substitutes but do not affect basic substitution eligibility. Series 218 parts exhibit lower Melting I²t (23.35) and lower DC Cold Resistance (0.0336 Ω) compared to Series 213 and 219XA parts. These differences may influence thermal response characteristics in specific circuit designs.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 021901.6M with any of the listed substitutes?

A: Yes. All listed parts are parametrically equivalent in current rating, voltage rating, response time, package dimensions, fuse type, and mounting requirements. Direct mechanical and electrical substitution is valid.

Q: What is the primary reason to substitute the 021901.6M?

A: The 021901.6M is classified as Obsolete. Substitute parts from the active Series 213, 218, and 219XA lines ensure continued availability and support. Additionally, all substitutes are ROHS3 Compliant, whereas the original part is RoHS non-compliant.

Q: Are there differences in thermal response between substitute options?

A: Yes. Series 218 parts have a Melting I²t of 23.35, while Series 213 and 219XA parts have a Melting I²t of 44.2. This indicates that Series 218 parts respond faster to thermal stress. Series 219XA parts (021901.6MXABP and 021901.6MXAF5P) also maintain the original 150 A Breaking Capacity, whereas Series 213 and 218 parts have a 35 A Breaking Capacity.

Q: Do all substitutes have the same approval certifications as the original?

A: No. While all substitutes carry multiple certifications, the specific agencies differ. The original 021901.6M includes KTL and UR certifications not present in all substitutes. Series 218 and 219XA parts include UL certification. Series 213 parts include CE certification. Verify that your selected substitute meets all required certifications for your application.

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

A: All three series meet the electrical and mechanical requirements for substitution. Series 213 and 218 have a 35 A Breaking Capacity, while Series 219XA maintains the original 150 A Breaking Capacity. Series 218 has a lower Melting I²t (23.35) compared to Series 213 and 219XA (44.2), resulting in faster thermal response. Series 219XA parts are the closest functional match to the original 021901.6M.

Q: Can I use these substitutes in applications requiring 150 A Breaking Capacity?

A: Only Series 219XA substitutes (021901.6MXABP and 021901.6MXAF5P) maintain the 150 A Breaking Capacity of the original part. Series 213 and 218 substitutes have a 35 A Breaking Capacity and are suitable only for applications where this lower capacity is acceptable.

Q: Are packaging options different among substitutes?

A: All substitutes are supplied in Bulk packaging. The original 021901.6M packaging designation is listed as "-". All parts maintain the same 5mm x 20mm physical dimensions and Requires Holder mounting type.

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