Littelfuse 0219004.TXAP Equivalent & Substitute Parts

Part Overview

The Littelfuse 0219004.TXAP is a 4 A, 250 V AC/DC glass cartridge fuse with 5mm x 20mm form factor and slow-blow response characteristics. This fuse is designed for applications requiring overcurrent protection in AC and DC circuits. The part is active in production with 971 units in stock. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity when the primary part becomes unavailable or when alternative certifications are required for specific regional markets.

Key Parameters

Parameter	Value
Current Rating	4 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 ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters: current rating (4 A), voltage rating (250 V AC), fuse type (cartridge glass), physical package (5mm x 20mm), response time (slow blow), and mounting configuration (requires holder). All substitute parts listed maintain these core electrical and mechanical specifications.

Littelfuse 219XA series parts (0219004.TXAP and 0219004.MXABP) share identical breaking capacity (150 A) and melting I²t (330). Littelfuse 213 and 218 series parts provide equivalent electrical performance with lower breaking capacity (40 A) and reduced melting I²t values, suitable for applications where these characteristics are acceptable. SCHURTER parts (0034.3123 and 0034.5623.11) are glass cartridge fuses meeting the same electrical specifications with comparable melting I²t performance. The SCHURTER 0034.2522 is a ceramic cartridge fuse variant with medium-blow response and is listed as a direct alternative where ceramic construction and medium-blow characteristics are acceptable.

Parameter Comparison

Part Number	Manufacturer	Series	Current (A)	Voltage AC (V)	Fuse Type	Package	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Inventory (Pcs)
0219004.TXAP	Littelfuse	219XA	4	250	Glass	5x20mm	Slow Blow	150	330	0.0158	971
0219004.MXABP	Littelfuse	219XA	4	250	Glass	5x20mm	Slow Blow	150	330	0.0158	1154
0213004.MXP	Littelfuse	213	4	250	Glass	5x20mm	Slow Blow	40	226.505	0.017	5552
0213004.TXP	Littelfuse	213	4	250	Glass	5x20mm	Slow Blow	40	226.505	0.017	793
0218004.HXP	Littelfuse	218	4	250	Glass	5x20mm	Slow Blow	40	69.1	0.0129	5280
0218004.MXP	Littelfuse	218	4	250	Glass	5x20mm	Slow Blow	40	69.1	0.0129	22400
0218004.TXP	Littelfuse	218	4	250	Glass	5x20mm	Slow Blow	40	69.1	0.0129	994
0034.3123	SCHURTER	FST 5x20	4	250	Glass	5x20mm	Slow Blow	40	68.3	-	58155
0034.5623.11	SCHURTER	SMD-FST	4	250	Glass	5x20mm	Slow Blow	40	68.3	-	1838
0034.2522	SCHURTER	FSM 5x20	4	250	Ceramic	5x20mm	Medium Blow	1000	35.2	-	2264

Engineering Selection Recommendations

For direct replacement with identical electrical and mechanical characteristics, select 0219004.MXABP from the Littelfuse 219XA series. This part maintains the same 150 A breaking capacity and 330 melting I²t as the primary part, with higher inventory availability (1154 units).

For applications where 40 A breaking capacity is acceptable, Littelfuse 218 series parts (0218004.HXP, 0218004.MXP, 0218004.TXP) provide the lowest melting I²t (69.1) with the highest inventory stock (22400 units for 0218004.MXP). These parts carry identical certifications including UL, VDE, CSA, and PSE.

SCHURTER 0034.3123 (FST 5x20 series) offers equivalent glass cartridge fuse performance with 40 A breaking capacity and 68.3 melting I²t, with the largest available inventory (58155 units). This part is certified by cURus, VDE, and PSE/JET.

The SCHURTER 0034.2522 ceramic cartridge fuse is a direct alternative only when medium-blow response and 1 kA breaking capacity are required by the application design. This part differs in fuse type (ceramic vs. glass) and response time (medium vs. slow blow).

Frequently Asked Questions (FAQ)

Q: Can I substitute 0218004.MXP for 0219004.TXAP?

A: Yes, for applications where 40 A breaking capacity is acceptable. Both parts share identical current rating (4 A), voltage rating (250 V AC), glass cartridge construction, 5x20mm package, and slow-blow response. The primary difference is breaking capacity (40 A vs. 150 A) and melting I²t (69.1 vs. 330). Verify your circuit design requirements before substitution.

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

A: All three series are 4 A, 250 V AC glass cartridge fuses in 5x20mm packages with slow-blow response. The 219XA series (0219004.TXAP, 0219004.MXABP) provides 150 A breaking capacity and 330 melting I²t. The 213 and 218 series provide 40 A breaking capacity with lower melting I²t values (226.505 for 213 series, 69.1 for 218 series). Series selection depends on circuit protection requirements and regional certification needs.

Q: Can I use the SCHURTER 0034.2522 ceramic fuse as a substitute?

A: The SCHURTER 0034.2522 is a ceramic cartridge fuse with medium-blow response, differing from the glass cartridge slow-blow design of the primary part. This part is suitable only when your application specifically requires ceramic construction, medium-blow characteristics, and 1 kA breaking capacity. Verify compatibility with your circuit design and holder specifications before use.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant. The primary part 0219004.TXAP and all Littelfuse and SCHURTER alternatives meet ROHS3 requirements.

Q: Which substitute part has the highest inventory availability?

A: SCHURTER 0034.3123 has the highest inventory with 58155 units in stock. This part is a glass cartridge fuse with 4 A, 250 V AC rating, 5x20mm package, and slow-blow response, making it a direct functional equivalent for most applications.

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