Littelfuse 0218.315VXP Glass Cartridge Fuse 315mA 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0218.315VXP is a slow-blow glass cartridge fuse rated at 315mA, 250VAC, with a 5mm x 20mm form factor. This fuse is designed for circuit protection in AC/DC applications requiring a slow-blow response characteristic. The part is active in production and widely stocked. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response time characteristics, and approval certifications to ensure direct functional interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	315 mA
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 is determined by the following criteria:

Primary Matching Parameters:

Current Rating: 315 mA (exact match required)
Voltage Rating: 250 V AC (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)

Secondary Considerations:

Operating Temperature Range: -55°C to 125°C (all substitutes match)
RoHS Compliance: ROHS3 Compliant (all substitutes match)

All identified substitute parts meet these criteria and are therefore functionally equivalent for direct replacement in applications designed for the 0218.315VXP.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Current Rating	Voltage Rating (AC)	Package	Response Time	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Product Status
0218.315VXP	Littelfuse Inc.	218	315 mA	250 V	5mm x 20mm	Slow Blow	35A	1.11	0.8475	Active
0213.315MXP	Littelfuse Inc.	213	315 mA	250 V	5mm x 20mm	Slow Blow	35A	1.14	0.8475	Active
0218.315MXP	Littelfuse Inc.	218	315 mA	250 V	5mm x 20mm	Slow Blow	35A	1.11	0.8475	Active
0219.315MXAP	Littelfuse Inc.	219XA	315 mA	250 V	5mm x 20mm	Slow Blow	150A	1.23	0.8475	Active
0034.3112	SCHURTER Inc.	FST 5x20	315 mA	250 V	5mm x 20mm	Slow Blow	35A	0.544	Not Specified	Active
0034.5612.11	SCHURTER Inc.	SMD-FST	315 mA	250 V	5mm x 20mm	Slow Blow	35A	0.544	Not Specified	Active
0034.5708.11	SCHURTER Inc.	SMD-FTT	315 mA	250 V	5mm x 20mm	Slow Blow	35A	4.17	Not Specified	Active
TSC-315MA	OptiFuse	TSC	315 mA	250 V	5mm x 20mm	Slow Blow	100A	0.5257	Not Specified	Active
TSD-315MA	OptiFuse	TSD	315 mA	250 V	5mm x 20mm	Slow Blow	35A	0.4833	Not Specified	Active

Engineering Selection Recommendations

All substitute parts listed are active products with current manufacturing status. Selection among equivalent parts should be based on:

Certification Requirements: The 0218.315VXP carries approvals from CCC, CE, CSA, KC, SEMKO, UL, and VDE. Littelfuse series 213, 218, and 219XA maintain overlapping certification coverage. SCHURTER parts (0034.3112, 0034.5612.11, 0034.5708.11) carry cURus and VDE certifications. OptiFuse parts (TSC-315MA, TSD-315MA) carry cULus and UL 248 certifications. Verify that the selected substitute meets the specific regulatory requirements of the target application.

Melting I²t Characteristics: Melting I²t values vary across substitutes (ranging from 0.4833 to 4.17). This parameter affects the thermal response profile of the fuse. Applications with specific thermal response requirements should match the I²t value closely to the original part or verify compatibility with circuit protection design parameters.

Breaking Capacity: Breaking capacity values range from 35A to 150A across the substitute list. The 0219.315MXAP and TSC-315MA offer higher breaking capacity (150A and 100A respectively) compared to the 0218.315VXP (35A). Higher breaking capacity provides enhanced protection margin in high-fault-current environments.

Inventory Availability: Stock levels vary significantly across manufacturers and part numbers, ranging from 879 to 8839 units. Procurement decisions may be influenced by availability and lead time requirements.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for the 0218.315VXP?

A: Yes. All listed substitute parts match the critical electrical and mechanical parameters: 315mA current rating, 250V AC voltage rating, 5mm x 20mm package, glass cartridge type, and slow-blow response characteristic. Direct mechanical and electrical interchangeability is confirmed for all substitutes.

Q: What is the significance of the different Melting I²t values?

A: Melting I²t defines the thermal energy required to melt the fuse element and is a measure of the fuse's thermal response time. Substitutes with significantly different I²t values (such as 0034.5708.11 at 4.17 versus TSD-315MA at 0.4833) will exhibit different response profiles under transient overcurrent conditions. For applications with specific thermal response requirements, match the I²t value to the original specification or verify circuit compatibility.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance status, matching the environmental compliance profile of the 0218.315VXP.

Q: Do all substitutes carry the same regulatory certifications?

A: No. While all substitutes are certified products, certification bodies differ. The 0218.315VXP carries UL, CSA, and KC approvals in addition to CE and VDE. Littelfuse series 213 and 218 maintain similar certification coverage. SCHURTER and OptiFuse parts carry different certification combinations (cURus, cULus, IEC 60127). Verify that the selected substitute meets the specific regulatory requirements mandated for your application region and end-use industry.

Q: What is the difference between the Littelfuse 218 series (0218.315VXP and 0218.315MXP)?

A: Both parts are from the Littelfuse 218 series with identical electrical ratings and package specifications. The primary difference is the response designation (VXP versus MXP). Both are active products and functionally equivalent for circuit protection applications.

Q: Can I substitute the 0219.315MXAP with its higher 150A breaking capacity?

A: Yes. The 0219.315MXAP is electrically and mechanically equivalent to the 0218.315VXP and offers enhanced breaking capacity (150A versus 35A). This higher breaking capacity provides additional protection margin in circuits subject to high fault currents. No compatibility issues arise from using the higher breaking capacity variant.

Q: Which substitute offers the best availability?

A: The 0218.315MXP (Littelfuse 218 series) offers the highest inventory level at 8839 units in stock, followed by 0034.3112 (SCHURTER) at 5998 units. Both are suitable for applications requiring immediate procurement.

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