Equivalent & Substitute Parts for 021901.6MXAF5P

Part Overview

The Littelfuse 021901.6MXAF5P is a 1.6 A, 250 V AC/DC glass cartridge fuse with 5mm x 20mm dimensions, designed for applications requiring slow-blow response characteristics. This fuse is part of the 219XA series and carries Active product status with full compliance to international safety standards including UL, CE, CSA, and VDE certifications. Alternative equivalent parts become necessary when addressing supply chain constraints, specific approval agency requirements, or application-specific breaking capacity and melting I²t specifications.

Key Parameters

Parameter	Specification
Current Rating	1.6 A
Voltage Rating (AC)	250 V
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Mounting Type	Requires Holder
Operating Temperature Range	-55°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 021901.6MXAF5P is determined by strict equivalence across the following parameters: current rating (1.6 A), voltage rating (250 V AC), package dimensions (5mm x 20mm), fuse type (cartridge glass), response time (slow blow), and mounting requirement (requires holder). All identified substitute parts maintain these core electrical and mechanical specifications. Variations in breaking capacity at rated voltage, melting I²t values, and approval agency certifications are documented but do not disqualify substitution when the primary electrical and physical parameters align. The substitute parts are grouped into two categories based on breaking capacity performance: high-capacity variants (150 A breaking capacity, 219XA and 239 series) and standard-capacity variants (35 A or 100 A breaking capacity, 213, 218, and 618 series).

Parameter Comparison

Part Number	Series	Current (A)	Voltage (V AC)	Package	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Inventory (Pcs)
021901.6MXAF5P	219XA	1.6	250	5x20mm	Slow Blow	150	44.2	0.0551	1065
021301.6MXP	213	1.6	250	5x20mm	Slow Blow	35	44.2	0.0551	1001
021301.6TXP	213	1.6	250	5x20mm	Slow Blow	35	44.2	0.0551	904
021801.6HXP	218	1.6	250	5x20mm	Slow Blow	35	23.35	0.0336	1213
021801.6MXP	218	1.6	250	5x20mm	Slow Blow	35	23.35	0.0336	2622
021801.6TXP	218	1.6	250	5x20mm	Slow Blow	35	23.35	0.0336	704
021901.6MXABP	219XA	1.6	250	5x20mm	Slow Blow	150	44.2	0.0551	2757
021901.6MXAP	219XA	1.6	250	5x20mm	Slow Blow	150	44.2	0.0551	2200
023901.6HXP	239	1.6	250	5x20mm	Slow Blow	100	30.43	0.1205	2100
023901.6MXP	239	1.6	250	5x20mm	Slow Blow	100	30.43	0.1205	5626
061801.6MXP	618	1.6	250	5x20mm	Slow Blow	35	23.35	0.0336	10400

Engineering Selection Recommendations

All substitute parts listed maintain electrical and mechanical compatibility with the 021901.6MXAF5P across current rating, voltage, package dimensions, response time, and operating temperature range. Selection among equivalents should be based on the following criteria:

High Breaking Capacity Applications (150 A): Parts 021901.6MXABP and 021901.6MXAP maintain identical breaking capacity and melting I²t characteristics to the primary part, with full compliance to CCC, CE, CSA, PSE, SEMKO, UL, and VDE standards. These are direct functional equivalents.

Standard Breaking Capacity Applications (35 A or 100 A): Parts from the 213, 218, 239, and 618 series provide reduced breaking capacity suitable for lower-fault-current environments. The 218 and 618 series exhibit lower DC cold resistance (0.0336 Ω) and reduced melting I²t (23.35) compared to the primary part. The 239 series offers intermediate breaking capacity (100 A) with moderate melting I²t (30.43).

Approval Agency Considerations: The 213 series includes BSI and UR certifications in addition to standard approvals. The 218 series includes K-MARK certification. The 239 series carries CE, CSA, KC, PSE, and UL certifications. Selection should align with regional regulatory requirements.

Inventory Availability: The 061801.6MXP (618 series) offers the highest inventory level at 10,400 pieces, followed by 023901.6MXP (239 series) at 5,626 pieces.

Frequently Asked Questions (FAQ)

Q: Can I substitute a 218 series fuse for the 219XA series fuse? A: Yes, from an electrical and mechanical standpoint. Both maintain 1.6 A, 250 V AC, 5mm x 20mm specifications and slow-blow response. However, the 218 series has a lower breaking capacity (35 A versus 150 A) and lower melting I²t (23.35 versus 44.2). Substitution is valid only if your application's fault current does not exceed 35 A and the lower melting I²t is acceptable for your circuit protection requirements.

Q: What is the difference between the 219XA and 239 series? A: Both are equivalent in current rating, voltage, and package. The 219XA series (021901.6MXAF5P, 021901.6MXABP, 021901.6MXAP) has a breaking capacity of 150 A and melting I²t of 44.2. The 239 series (023901.6HXP, 023901.6MXP) has a breaking capacity of 100 A and melting I²t of 30.43. The 219XA series is suitable for higher fault-current environments.

Q: Does DC cold resistance variation affect substitution? A: DC cold resistance differences (ranging from 0.0336 Ω to 0.1205 Ω across the substitute parts) reflect internal construction variations but do not prevent substitution. These values are within acceptable ranges for 1.6 A cartridge fuses and do not compromise circuit protection function when all other electrical parameters match.

Q: Are all substitute parts ROHS3 compliant? A: Yes, all listed substitute parts carry ROHS3 compliance and REACH Unaffected status, matching the primary part's environmental compliance profile.

Q: Which substitute part has the best availability? A: The 061801.6MXP (618 series) offers the highest inventory at 10,400 pieces. This part maintains electrical equivalence with 1.6 A, 250 V AC, 5mm x 20mm specifications and is suitable for applications with fault currents not exceeding 35 A.

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