Littelfuse 0239.200TXP Equivalent & Substitute Parts

Part Overview

The Littelfuse 0239.200TXP is a 200 mA, 250 V AC/DC glass cartridge fuse in 5mm x 20mm form factor with slow-blow response characteristics. This fuse is designed for circuit protection in applications requiring moderate current limiting with delayed response to transient overcurrents. The part is active in production and widely available. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity.

Key Parameters

Parameter	Value
Current Rating	200 mA
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 to 125°C
Breaking Capacity @ Rated Voltage	35 A
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 0239.200TXP is determined by strict equivalence across the following critical parameters:

Current Rating: 200 mA (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Mounting Type: Requires Holder (exact match required)
Operating Temperature Range: -55°C to 125°C (exact match required)

All substitute parts listed meet these criteria. Variations in secondary parameters such as melting I²t, DC cold resistance, breaking capacity, and approval agencies do not disqualify substitution when primary electrical and mechanical parameters are identical.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating	Voltage (AC)	Package	Response Time	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Approval Agencies	Inventory (Pcs)
0239.200TXP	Littelfuse Inc.	239	200 mA	250 V	5mm x 20mm	Slow Blow	35 A	0.165	3.8725	CE, CSA, KC, UL	1145
0218.200HXP	Littelfuse Inc.	218	200 mA	250 V	5mm x 20mm	Slow Blow	35 A	0.341	1.6	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE	2343
0218.200MXP	Littelfuse Inc.	218	200 mA	250 V	5mm x 20mm	Slow Blow	35 A	0.341	1.6	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE	3993
0219.200MXAP	Littelfuse Inc.	219XA	200 mA	250 V	5mm x 20mm	Slow Blow	150 A	0.32	1.6	CCC, CE, CSA, SEMKO, UL, VDE	2418
0239.200HXP	Littelfuse Inc.	239	200 mA	250 V	5mm x 20mm	Slow Blow	35 A	0.165	3.8725	CE, CSA, KC, UL	1578
0239.200MXP	Littelfuse Inc.	239	200 mA	250 V	5mm x 20mm	Slow Blow	35 A	0.165	3.8725	CE, CSA, KC, UL	2167
0034.3110	SCHURTER Inc.	FST 5x20	200 mA	250 V	5mm x 20mm	Slow Blow	35 A	0.256	Not Provided	CCC, cURus, VDE	2290
0034.5610.11	SCHURTER Inc.	SMD-FST	200 mA	250 V	5mm x 20mm	Slow Blow	35 A	0.256	Not Provided	cURus, VDE	1028
TSD-200MA	OptiFuse	TSD	200 mA	250 V	5mm x 20mm	Slow Blow	35 A	0.1628	Not Provided	IEC 60127	1691

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance and REACH unaffected status, matching the environmental and regulatory posture of the 0239.200TXP.

Littelfuse 239 series parts (0239.200HXP, 0239.200MXP) are direct functional equivalents within the same manufacturer family, offering identical electrical characteristics and approval agency coverage (CE, CSA, KC, UL).

Littelfuse 218 series parts (0218.200HXP, 0218.200MXP) provide equivalent functionality with expanded approval agency coverage (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE) and higher inventory availability. These parts feature lower DC cold resistance (1.6 Ohms vs. 3.8725 Ohms) and higher melting I²t (0.341 vs. 0.165).

Littelfuse 219XA series part (0219.200MXAP) offers equivalent electrical performance with significantly higher breaking capacity (150 A vs. 35 A) and expanded approval agency coverage.

SCHURTER FST 5x20 series parts (0034.3110, 0034.5610.11) provide cross-manufacturer equivalence with approval agencies CCC, cURus, and VDE. The 0034.3110 offers higher inventory (2290 pcs) compared to 0034.5610.11 (1028 pcs).

OptiFuse TSD-200MA provides cross-manufacturer equivalence with IEC 60127 approval and the lowest melting I²t value (0.1628).

Frequently Asked Questions (FAQ)

Q: Can I substitute the 0239.200TXP with any of the listed parts?

A: Yes. All listed parts meet the critical substitution criteria: 200 mA current rating, 250 V AC voltage rating, 5mm x 20mm package, slow-blow response, and -55°C to 125°C operating temperature range. Physical form factor and electrical performance are equivalent.

Q: What is the difference between Littelfuse 239 and 218 series fuses?

A: Both series meet the electrical and mechanical requirements for substitution. The 218 series has lower DC cold resistance (1.6 Ohms vs. 3.8725 Ohms) and higher melting I²t (0.341 vs. 0.165). The 218 series also carries broader approval agency certifications (CCC, K-MARK, SEMKO in addition to CE, CSA, UL, VDE).

Q: Why does the 0219.200MXAP have a higher breaking capacity?

A: The 0219.200MXAP is rated for 150 A breaking capacity at rated voltage, compared to 35 A for other parts. This does not affect substitution eligibility, as breaking capacity is not a primary substitution criterion. The part remains functionally equivalent for the specified current rating and voltage.

Q: Are cross-manufacturer substitutes (SCHURTER, OptiFuse) fully compatible?

A: Yes. SCHURTER 0034.3110 and 0034.5610.11, and OptiFuse TSD-200MA meet all critical electrical and mechanical parameters. Physical dimensions, current rating, voltage rating, response time, and package form factor are identical. Approval agency coverage differs but does not affect functional compatibility in applications where the original certifications are acceptable.

Q: What inventory levels should I consider for procurement?

A: Littelfuse 0218.200MXP offers the highest inventory (3993 pcs), followed by 0218.200HXP (2343 pcs) and SCHURTER 0034.3110 (2290 pcs). The main part 0239.200TXP has 1145 pcs available. Inventory levels support both immediate and planned procurement needs.

Q: Do all substitute parts have the same approval certifications?

A: No. Approval agencies vary by manufacturer and series. The 0239.200TXP carries CE, CSA, KC, and UL certifications. Littelfuse 218 series parts add CCC, K-MARK, and SEMKO. SCHURTER parts carry CCC, cURus, and VDE. OptiFuse TSD-200MA is certified to IEC 60127. Select the part whose certifications match your application requirements.

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