Littelfuse 023901.6TXP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 023901.6TXP is a 1.6 A, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm package format. This fuse is designed for circuit protection in applications requiring slow-blow response characteristics and is actively manufactured. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response time classification, and regulatory compliance certifications.

Key Parameters

Parameter	023901.6TXP
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
Breaking Capacity @ Rated Voltage	100 A
Operating Temperature Range	-55°C to 125°C
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the 023901.6TXP are grouped based on strict equivalence of the following parameters:

Current Rating: 1.6 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Response Time: Slow Blow (exact match required)
Package Dimensions: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Mounting Type: Requires Holder (exact match required)

All substitute parts listed maintain these core electrical and mechanical specifications. Variations in breaking capacity, melting I²t, DC cold resistance, and regulatory certifications are noted but do not disqualify substitution when the above parameters match.

Parameter Comparison

Part Number	Series	Current Rating	Voltage (AC)	Response Time	Package	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Inventory (Pcs)
023901.6TXP	239	1.6 A	250 V	Slow Blow	5mm x 20mm	100 A	30.43	0.1205	1080
021301.6MXP	213	1.6 A	250 V	Slow Blow	5mm x 20mm	35 A	44.2	0.0551	1001
021301.6TXP	213	1.6 A	250 V	Slow Blow	5mm x 20mm	35 A	44.2	0.0551	904
021801.6HXP	218	1.6 A	250 V	Slow Blow	5mm x 20mm	35 A	23.35	0.0336	1213
021801.6MXP	218	1.6 A	250 V	Slow Blow	5mm x 20mm	35 A	23.35	0.0336	2622
021801.6TXP	218	1.6 A	250 V	Slow Blow	5mm x 20mm	35 A	23.35	0.0336	704
021901.6MXABP	219XA	1.6 A	250 V	Slow Blow	5mm x 20mm	150 A	44.2	0.0551	2757
021901.6MXAP	219XA	1.6 A	250 V	Slow Blow	5mm x 20mm	150 A	44.2	0.0551	2200
023901.6HXP	239	1.6 A	250 V	Slow Blow	5mm x 20mm	100 A	30.43	0.1205	2100
023901.6MXP	239	1.6 A	250 V	Slow Blow	5mm x 20mm	100 A	30.43	0.1205	5626
061801.6MXP	618	1.6 A	250 V	Slow Blow	5mm x 20mm	35 A	23.35	0.0336	10400

Engineering Selection Recommendations

All listed substitute parts maintain the core electrical and mechanical specifications required for direct substitution with the 023901.6TXP. Selection among equivalents should be based on:

Regulatory Compliance: The 023901.6TXP carries CE, CSA, KC, PSE, and UL certifications. Series 218 parts (021801.6HXP, 021801.6MXP, 021801.6TXP) and Series 618 (061801.6MXP) provide expanded certification coverage including CCC, SEMKO, and VDE. Series 213 parts (021301.6MXP, 021301.6TXP) and Series 219XA parts (021901.6MXABP, 021901.6MXAP) offer additional certifications including BSI, CCC, and UR.

Breaking Capacity Considerations: The 023901.6TXP and Series 239 variants (023901.6HXP, 023901.6MXP) provide 100 A breaking capacity. Series 218, 213, and 618 parts provide 35 A breaking capacity. Series 219XA parts (021901.6MXABP, 021901.6MXAP) provide 150 A breaking capacity. Application requirements determine whether higher or lower breaking capacity is acceptable.

Inventory Availability: Series 618 (061801.6MXP) offers the highest stock level at 10,400 pieces. Series 239 (023901.6MXP) provides 5,626 pieces. Series 218 (021801.6MXP) provides 2,622 pieces.

Frequently Asked Questions (FAQ)

Q: Can I substitute 021801.6MXP for 023901.6TXP?

A: Yes. Both parts share identical current rating (1.6 A), voltage rating (250 V AC), response time (Slow Blow), and package dimensions (5mm x 20mm). The 021801.6MXP has a lower breaking capacity (35 A vs. 100 A) and different DC cold resistance (0.0336 Ohms vs. 0.1205 Ohms), but these differences do not prevent substitution when the application does not require the higher breaking capacity of the original part.

Q: What is the difference between 023901.6TXP and 021901.6MXABP?

A: Both parts are electrically and mechanically equivalent with 1.6 A, 250 V, slow-blow characteristics in 5mm x 20mm packages. The primary difference is breaking capacity: 023901.6TXP provides 100 A, while 021901.6MXABP provides 150 A. The 021901.6MXABP also carries expanded regulatory certifications (CCC, CE, CSA, PSE, SEMKO, UL, VDE) compared to the 023901.6TXP (CE, CSA, KC, PSE, UL).

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the environmental compliance status of the 023901.6TXP.

Q: Does the DC cold resistance difference affect substitution?

A: DC cold resistance varies among the substitute parts (ranging from 0.0336 Ohms to 0.1205 Ohms) but does not disqualify substitution. The application circuit design determines whether this parameter is critical. Consult application requirements before selecting a part with significantly different DC cold resistance.

Q: Which substitute part has the best availability?

A: The 061801.6MXP (Series 618) has the highest inventory at 10,400 pieces. This part maintains all core electrical and mechanical specifications of the 023901.6TXP while offering expanded regulatory certifications (CCC, CE, CSA, UR, VDE).

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