Littelfuse 0219.500TXAP Equivalent & Substitute Parts

Part Overview

The Littelfuse 0219.500TXAP is a 500 mA, 250 V AC/DC slow blow glass cartridge fuse in 5mm x 20mm form factor, designed for applications requiring overcurrent protection with delayed response characteristics. This part is Active status and widely used in industrial and consumer electronics. Substitute parts are identified when equivalent electrical parameters, mechanical dimensions, and functional characteristics align with the original specification, enabling direct replacement in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	500 mA
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 ~ 125°C
DC Cold Resistance	0.37 Ohms
Breaking Capacity @ Rated Voltage	150A
Melting I²t	3

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching the following critical parameters: current rating (500 mA), voltage rating (250 V AC), response time (Slow Blow), package dimensions (5mm x 20mm), fuse type (Cartridge, Glass), and mounting requirement (Requires Holder). Parts are grouped into two categories:

Category 1: Parametric Equivalents (Littelfuse Series) Parts 0214.600MXP, 0218.500HXP, 0218.500MXP, 0219.500MXAP, 0239.500HXP, 0239.500MXP, and 0618.500MXP share identical current, voltage, response time, package, and mounting specifications. Variations in breaking capacity and melting I²t do not prevent substitution when application requirements permit.

Category 2: Cross-Manufacturer Equivalents (SCHURTER Series) Parts 0034.3114 and 0034.5614.11 from SCHURTER Inc. match all critical electrical and mechanical parameters. Part 0034.2513 differs in response time classification (Medium Blow vs. Slow Blow) and includes DC voltage rating specification (125 V DC), making it suitable only for applications where medium blow response is acceptable.

Parameter Comparison

Part Number	Manufacturer	Current Rating (mA)	Voltage AC (V)	Response Time	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Inventory (Pcs)
0219.500TXAP	Littelfuse	500	250	Slow Blow	5x20mm	150	3	0.37	662
0214.600MXP	Littelfuse	500	250	Slow Blow	5x20mm	35	2.905	0.37	2100
0218.500HXP	Littelfuse	500	250	Slow Blow	5x20mm	35	2.825	0.37	4644
0218.500MXP	Littelfuse	500	250	Slow Blow	5x20mm	35	2.825	0.37	15465
0219.500MXAP	Littelfuse	500	250	Slow Blow	5x20mm	150	3	0.37	1056
0239.500HXP	Littelfuse	500	250	Slow Blow	5x20mm	35	1.985	0.909	1485
0239.500MXP	Littelfuse	500	250	Slow Blow	5x20mm	35	1.985	0.909	2300
0618.500MXP	Littelfuse	500	250	Slow Blow	5x20mm	35	2.825	0.37	16300
0034.3114	SCHURTER	500	250	Slow Blow	5x20mm	35	3	Not specified	12470
0034.5614.11	SCHURTER	500	250	Slow Blow	5x20mm	35	3	Not specified	1819
0034.2513	SCHURTER	500	250	Medium Blow	5x20mm	80	0.675	Not specified	911

Engineering Selection Recommendations

Primary Substitutes (Identical Response Characteristics) Parts 0218.500MXP, 0218.500HXP, 0214.600MXP, 0219.500MXAP, 0618.500MXP, 0034.3114, and 0034.5614.11 are direct functional equivalents with matching slow blow response. Selection among these should prioritize inventory availability and certification requirements. The 0218.500MXP offers highest inventory (15,465 pcs) with full compliance certifications (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE). The 0034.3114 (SCHURTER) provides 12,470 pcs with CCC, cURus, and VDE certifications.

High Breaking Capacity Alternative The 0219.500MXAP maintains identical electrical parameters and breaking capacity (150A) to the original 0219.500TXAP, with 1,056 pcs available. This part is suitable when application circuits require higher fault current interruption capability.

Resistance Considerations Parts 0239.500HXP and 0239.500MXP exhibit elevated DC cold resistance (0.909 Ohms vs. 0.37 Ohms), resulting in increased voltage drop and heat dissipation. These parts are suitable only when circuit design accommodates higher resistance characteristics.

Response Time Deviation Part 0034.2513 (SCHURTER) operates with Medium Blow response instead of Slow Blow, with lower melting I²t (0.675 vs. 3). This part is not recommended as a direct substitute unless application requirements explicitly permit faster response characteristics.

Compliance Alignment All recommended substitutes maintain ROHS3 compliance and REACH unaffected status. Littelfuse parts provide broader certification coverage (UL, VDE, CSA, CCC, SEMKO). SCHURTER parts 0034.3114 and 0034.5614.11 provide cURus and VDE certifications suitable for North American and European markets.

Frequently Asked Questions (FAQ)

Q: Can 0218.500MXP replace 0219.500TXAP directly? A: Yes. Both parts share identical current rating (500 mA), voltage rating (250 V AC), response time (Slow Blow), package dimensions (5mm x 20mm), and mounting type. The 0218.500MXP has lower breaking capacity (35A vs. 150A), which is acceptable in applications where fault current does not exceed 35A.

Q: What is the difference between Littelfuse 219 and 218 series? A: Both series provide 500 mA, 250 V AC slow blow response in 5x20mm packages. The 219 series (0219.500TXAP, 0219.500MXAP) offers 150A breaking capacity, while the 218 series (0218.500HXP, 0218.500MXP) provides 35A breaking capacity. Selection depends on maximum fault current in the application circuit.

Q: Are SCHURTER FST 5x20 fuses (0034.3114) compatible with Littelfuse holders? A: Yes. Both manufacturers produce 5mm x 20mm cartridge fuses requiring standard holders. Mechanical dimensions and electrical parameters are equivalent, enabling use in existing Littelfuse fuse holders.

Q: Why do 0239.500HXP and 0239.500MXP have higher DC cold resistance? A: The 239 series exhibits 0.909 Ohms resistance compared to 0.37 Ohms in other series. This characteristic affects voltage drop and thermal performance. These parts are suitable only when circuit design accommodates increased resistance.

Q: Can 0034.2513 (Medium Blow) replace 0219.500TXAP (Slow Blow)? A: No. The 0034.2513 operates with Medium Blow response and lower melting I²t (0.675 vs. 3), resulting in faster fuse operation. This part is not a direct substitute unless application requirements explicitly permit faster response.

Q: Which substitute offers best inventory availability? A: The 0618.500MXP provides highest inventory at 16,300 pcs, followed by 0218.500MXP at 15,465 pcs. Both are Littelfuse slow blow 500 mA, 250 V AC fuses in 5x20mm packages with full compliance certifications.

Q: What certifications should I verify for my application? A: Verify that the selected substitute meets your regional requirements. UL certification is required for North American applications. CE and VDE certifications apply to European markets. CCC certification is required for Chinese markets. All recommended substitutes carry at least one of these certifications.

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