Littelfuse 023901.6H Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 023901.6H is a 1.6 A, 250 V AC/DC glass cartridge fuse with slow-blow response characteristics, designed for 5mm x 20mm holder mounting. This part is classified as obsolete. Equivalent and substitute parts from the active product lines provide direct functional replacement with enhanced compliance certifications and improved electrical characteristics.

Key Parameters

Parameter	023901.6H
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
Operating Temperature Range	-55°C to 125°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution is determined by strict equivalence across the following parameters:

Current Rating: 1.6 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (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. Differences in breaking capacity, melting I²t, DC cold resistance, and approval agencies are noted but do not preclude substitution when electrical and mechanical parameters are identical.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating	Voltage (AC)	Package	Response Time	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Product Status	RoHS Status
023901.6H	Littelfuse Inc.	239	1.6 A	250 V	5mm x 20mm	Slow Blow	100 A	31.25	0.122	Obsolete	Non-compliant
021301.6MXBP	Littelfuse Inc.	213	1.6 A	250 V	5mm x 20mm	Slow Blow	35 A	44.2	0.0551	Active	ROHS3 Compliant
021301.6MXP	Littelfuse Inc.	213	1.6 A	250 V	5mm x 20mm	Slow Blow	35 A	44.2	0.0551	Active	ROHS3 Compliant
021301.6TXP	Littelfuse Inc.	213	1.6 A	250 V	5mm x 20mm	Slow Blow	35 A	44.2	0.0551	Active	ROHS3 Compliant
021801.6HXP	Littelfuse Inc.	218	1.6 A	250 V	5mm x 20mm	Slow Blow	35 A	23.35	0.0336	Active	ROHS3 Compliant
021801.6MXBP	Littelfuse Inc.	218	1.6 A	250 V	5mm x 20mm	Slow Blow	35 A	23.35	0.0336	Active	ROHS3 Compliant
021801.6MXP	Littelfuse Inc.	218	1.6 A	250 V	5mm x 20mm	Slow Blow	35 A	23.35	0.0336	Active	ROHS3 Compliant
021801.6TXP	Littelfuse Inc.	218	1.6 A	250 V	5mm x 20mm	Slow Blow	35 A	23.35	0.0336	Active	ROHS3 Compliant
021801.6VXP	Littelfuse Inc.	218	1.6 A	250 V	5mm x 20mm	Slow Blow	35 A	23.35	0.0336	Active	ROHS3 Compliant
021901.6MXABP	Littelfuse Inc.	219XA	1.6 A	250 V	5mm x 20mm	Slow Blow	150 A	44.2	0.0551	Active	ROHS3 Compliant
021901.6MXAF5P	Littelfuse Inc.	219XA	1.6 A	250 V	5mm x 20mm	Slow Blow	150 A	44.2	0.0551	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance, addressing the RoHS non-compliance status of the obsolete 023901.6H. Selection among substitutes depends on application-specific requirements:

Series 213 (021301.6MXBP, 021301.6MXP, 021301.6TXP): Active status with broad international certifications (BSI, CCC, CE, CSA, PSE, SEMKO, UR, VDE). Breaking capacity of 35 A and melting I²t of 44.2 provide moderate protection levels.

Series 218 (021801.6HXP, 021801.6MXBP, 021801.6MXP, 021801.6TXP, 021801.6VXP): Active status with comprehensive certifications including K-MARK and UL. Lower melting I²t (23.35) and DC cold resistance (0.0336 Ohms) compared to Series 213. Breaking capacity of 35 A.

Series 219XA (021901.6MXABP, 021901.6MXAF5P): Active status with enhanced breaking capacity of 150 A. Certifications include CCC, CE, CSA, PSE, SEMKO, UL, and VDE. Melting I²t of 44.2 and DC cold resistance of 0.0551 Ohms match Series 213 electrical characteristics.

Frequently Asked Questions (FAQ)

Q: Can any of these substitute parts directly replace the 023901.6H?

A: Yes. All listed parts share identical current rating (1.6 A), voltage rating (250 V AC), package dimensions (5mm x 20mm), fuse type (cartridge glass), response time (slow blow), and operating temperature range (-55°C to 125°C). Physical and electrical compatibility is confirmed.

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

A: The primary differences are breaking capacity and melting I²t values. Series 218 has lower melting I²t (23.35) and DC cold resistance (0.0336 Ohms) compared to Series 213 and 219XA. Series 219XA offers the highest breaking capacity (150 A). All three series meet the core electrical and mechanical requirements for substitution.

Q: Does the 023901.6H require a specific holder type?

A: The 023901.6H requires a standard 5mm x 20mm fuse holder. All substitute parts use the same package dimensions and holder compatibility.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts carry ROHS3 compliance status, whereas the original 023901.6H is RoHS non-compliant. This represents an improvement in environmental and regulatory compliance.

Q: What certifications should I prioritize when selecting a substitute?

A: Selection depends on your application's regulatory requirements. Series 218 and 219XA include UL and K-MARK certifications. Series 213 includes UR and VDE certifications. All series include CSA and CE certifications. Verify that the selected part's certification set matches your application's geographic and industry requirements.

Q: Can I use Series 219XA parts in applications previously using the 023901.6H?

A: Yes. Series 219XA parts (021901.6MXABP, 021901.6MXAF5P) are direct electrical and mechanical equivalents with enhanced breaking capacity (150 A versus 100 A on the original). The higher breaking capacity provides additional protection margin without affecting normal circuit operation.

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