Littelfuse 0239001.VXP Glass Cartridge Fuse 1A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0239001.VXP is a 1 A, 250 V AC/DC glass cartridge fuse in 5mm x 20mm form factor with slow-blow response characteristics. This component is classified as Active product status and is designed for applications requiring overcurrent protection in electrical circuits. Substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when alternative manufacturers' components meet identical electrical and mechanical specifications for circuit protection requirements.

Key Parameters

Parameter	Value
Current Rating	1 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35A
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 0239001.VXP is determined by strict equivalence across the following critical parameters:

Current Rating: 1 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Mounting Type: Requires Holder (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)

All substitute parts listed below meet these mandatory 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 specifications align.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Product Status
0239001.VXP	Littelfuse Inc.	239	1	250	Slow Blow	5x20mm	35	11.295	0.2965	Active
0213001.MXP	Littelfuse Inc.	213	1	250	Slow Blow	5x20mm	35	19.2	0.1165	Active
0213001.TXP	Littelfuse Inc.	213	1	250	Slow Blow	5x20mm	35	19.2	0.1165	Active
0218001.HXP	Littelfuse Inc.	218	1	250	Slow Blow	5x20mm	35	6.73	0.0613	Active
0218001.MXP	Littelfuse Inc.	218	1	250	Slow Blow	5x20mm	35	6.73	0.0613	Active
0218001.TXP	Littelfuse Inc.	218	1	250	Slow Blow	5x20mm	35	6.73	0.0613	Active
0219001.MXABP	Littelfuse Inc.	219XA	1	250	Slow Blow	5x20mm	150	19.2	0.1165	Active
0219001.MXAP	Littelfuse Inc.	219XA	1	250	Slow Blow	5x20mm	150	19.2	0.1165	Active
0034.3117	SCHURTER Inc.	FST 5x20	1	250	Slow Blow	5x20mm	35	3.3	—	Active
0034.3117.G	SCHURTER Inc.	FST 5x20	1	250	Slow Blow	5x20mm	35	3.3	—	Active
0034.5617.11	SCHURTER Inc.	SMD-FST	1	250	Slow Blow	5x20mm	35	3.3	—	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status, ensuring continued availability and manufacturer support. Selection among equivalent parts should be based on:

Littelfuse Series 218 (0218001.HXP, 0218001.MXP, 0218001.TXP): These parts offer the lowest DC cold resistance (0.0613 Ω) and fastest response characteristics (Melting I²t: 6.73). Approval agencies include CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, and VDE, providing broad international compliance coverage.

Littelfuse Series 213 (0213001.MXP, 0213001.TXP): These parts provide moderate response time (Melting I²t: 19.2) with approval from BSI, CCC, CE, CSA, PSE, SEMKO, UR, and VDE. Inventory availability is substantial (10,400 and 783 units respectively).

Littelfuse Series 219XA (0219001.MXABP, 0219001.MXAP): These parts feature elevated breaking capacity (150A versus 35A) with Melting I²t of 19.2. Approval agencies include CCC, CE, CSA, PSE, SEMKO, UL, and VDE.

SCHURTER FST Series (0034.3117, 0034.3117.G, 0034.5617.11): These parts deliver the fastest response (Melting I²t: 3.3) with approval from CCC, cURus, PSE/JET, and VDE. The SCHURTER option provides cross-manufacturer diversity for supply chain resilience.

All substitute parts are ROHS3 compliant and REACH unaffected, maintaining environmental and regulatory alignment with the primary part.

Frequently Asked Questions (FAQ)

Q: Can I substitute a Littelfuse Series 218 part for the 0239001.VXP?

A: Yes. Series 218 parts (0218001.HXP, 0218001.MXP, 0218001.TXP) are direct electrical and mechanical equivalents. All share identical current rating (1 A), voltage rating (250 V AC), response time (Slow Blow), and 5x20mm package. The lower DC cold resistance and faster melting characteristics do not prevent substitution in circuits designed for the primary part.

Q: What is the difference between Littelfuse Series 213 and Series 218?

A: Both series meet all primary substitution criteria. Series 218 exhibits faster response (Melting I²t: 6.73 versus 19.2) and lower DC cold resistance (0.0613 Ω versus 0.1165 Ω). Series 213 provides higher Melting I²t, resulting in slower response to transient overcurrents. Selection depends on circuit protection requirements and approval agency preferences.

Q: Are SCHURTER parts compatible with Littelfuse fuse holders?

A: Yes. SCHURTER FST 5x20 series parts (0034.3117, 0034.3117.G, 0034.5617.11) maintain identical 5mm x 20mm mechanical dimensions and mounting requirements. Physical compatibility with standard fuse holders is assured.

Q: Why do some parts have higher breaking capacity (150A versus 35A)?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt. Littelfuse Series 219XA parts (0219001.MXABP, 0219001.MXAP) feature 150A breaking capacity compared to 35A in other series. This parameter does not affect substitution eligibility when primary electrical specifications align. Selection should reflect circuit fault current levels.

Q: What does Melting I²t represent?

A: Melting I²t is the thermal energy required to melt the fuse element, expressed in ampere-squared seconds. Lower values indicate faster response to overcurrent. SCHURTER parts (Melting I²t: 3.3) respond fastest, followed by Series 218 (6.73), Series 239 (11.295), and Series 213/219XA (19.2). All values are acceptable for the specified 1 A current rating and 250 V voltage rating.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant status, ensuring compliance with hazardous substance restrictions in electronics manufacturing and end-of-life recycling requirements.

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