Littelfuse 023901.6VXP Glass Cartridge Fuse 1.6A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 023901.6VXP is a 1.6 A, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm form factor, requiring a fuse holder for installation. This Series 239 component is actively produced and widely used in industrial and consumer electronics for circuit protection. Substitute parts become necessary due to inventory availability, regional certification requirements, or specific application performance characteristics such as breaking capacity and melting I²t values.

Key Parameters

Parameter	Value
Manufacturer Part Number	023901.6VXP
Manufacturer	Littelfuse Inc.
Current Rating	1.6 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	100 A
Melting I²t	30.43
Operating Temperature Range	-55°C to 125°C
DC Cold Resistance	0.1205 Ohms
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the 023901.6VXP are grouped based on strict electrical and mechanical compatibility criteria. All substitute candidates maintain the following core parameters:

Current Rating: 1.6 A
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

Substitutes differ in the following parameters, which may be selected based on application requirements:

Breaking Capacity @ Rated Voltage (35 A, 100 A, or 150 A)
Melting I²t (23.35, 30.43, or 44.2)
DC Cold Resistance (0.0336, 0.0551, or 0.1205 Ohms)
Series designation (213, 218, 219XA, 239, 618)
Approval Agency certifications

Parameter Comparison

Part Number	Series	Current (A)	Voltage (V AC)	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Inventory (Pcs)
023901.6VXP	239	1.6	250	100	30.43	0.1205	1110
021301.6MXP	213	1.6	250	35	44.2	0.0551	1001
021301.6TXP	213	1.6	250	35	44.2	0.0551	904
021801.6HXP	218	1.6	250	35	23.35	0.0336	1213
021801.6MXP	218	1.6	250	35	23.35	0.0336	2622
021801.6TXP	218	1.6	250	35	23.35	0.0336	704
021901.6MXABP	219XA	1.6	250	150	44.2	0.0551	2757
021901.6MXAP	219XA	1.6	250	150	44.2	0.0551	2200
023901.6HXP	239	1.6	250	100	30.43	0.1205	2100
023901.6MXP	239	1.6	250	100	30.43	0.1205	5626
061801.6MXP	618	1.6	250	35	23.35	0.0336	10400

Engineering Selection Recommendations

Selection of substitute parts should be based on the following criteria:

Breaking Capacity Matching: The 023901.6VXP has a 100 A breaking capacity. Series 239 parts (023901.6HXP, 023901.6MXP) maintain this specification. Series 218 and 618 parts offer 35 A breaking capacity, suitable for lower-fault-current applications. Series 219XA parts (021901.6MXABP, 021901.6MXAP) provide 150 A breaking capacity for high-fault-current environments.

Melting I²t Characteristics: The 023901.6VXP has a melting I²t of 30.43. Series 218 and 618 parts have lower I²t values (23.35), providing faster response. Series 213 and 219XA parts have higher I²t values (44.2), providing slower response characteristics.

Certification Alignment: The 023901.6VXP carries CE, CSA, KC, PSE, and UL certifications. Series 218 parts include additional certifications (CCC, K-MARK, SEMKO, VDE). Series 213 parts include BSI, CCC, SEMKO, UR, and VDE. Series 219XA parts include CCC, SEMKO, and VDE. Series 618 parts include CCC, UR, and VDE. Select substitutes based on regional compliance requirements.

Resistance Characteristics: The 023901.6VXP has 0.1205 Ohms DC cold resistance. Lower-resistance alternatives (0.0336 or 0.0551 Ohms) may be selected where voltage drop minimization is required.

Frequently Asked Questions (FAQ)

Q: Can Series 218 parts substitute for Series 239 parts? A: Series 218 parts are electrically compatible in terms of current, voltage, and package dimensions. However, they have lower breaking capacity (35 A vs. 100 A) and lower melting I²t (23.35 vs. 30.43). Use only in applications where fault current does not exceed 35 A and faster response is acceptable.

Q: What is the difference between melting I²t values? A: Melting I²t determines the thermal energy required to melt the fuse element. Lower I²t values (23.35) indicate faster response to overcurrent. Higher I²t values (44.2) indicate slower response, providing better tolerance for inrush currents. Select based on application requirements.

Q: Are all substitute parts ROHS3 compliant? A: Yes, all listed substitute parts are ROHS3 compliant and carry REACH Unaffected status.

Q: Does DC cold resistance affect fuse selection? A: DC cold resistance affects voltage drop across the fuse during normal operation. Lower resistance (0.0336 Ohms) minimizes voltage drop. Higher resistance (0.1205 Ohms) may be acceptable in applications where voltage drop is not critical. Select based on circuit design requirements.

Q: Can Series 219XA parts with 150 A breaking capacity be used in place of Series 239? A: Yes, Series 219XA parts are compatible and provide higher breaking capacity (150 A vs. 100 A), offering enhanced protection in high-fault-current environments. They maintain the same current rating, voltage, and package dimensions.

Q: What certifications should I verify for my application? A: Verify that the selected substitute part carries all certifications required by your regional standards and application. The 023901.6VXP requires CE, CSA, KC, PSE, and UL. Confirm that substitute parts include these or equivalent certifications for your market.

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