V385LC40CP Equivalent & Substitute Parts

Part Overview

The V385LC40CP is a 620V varistor manufactured by Littelfuse Inc., designed for transient voltage suppression applications. This through-hole disc component (20mm) provides 10 kA surge current capacity with 370J energy absorption. The part is Active status and fully compliant with RoHS3 and REACH regulations, making it suitable for industrial and commercial voltage protection circuits. Substitute parts are identified to provide equivalent electrical performance for applications requiring alternative sourcing or inventory management.

Substiute Parts

V385LC40CP

Littelfuse Inc.In Stock: 1015V385LC40CP Datasheet

Current PartRFQ

ERZ-V20D621

Panasonic Electronic ComponentsIn Stock: 2438ERZ-V20D621 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the V385LC40CP is based on the following critical electrical and mechanical parameters:

• Varistor Voltage (Typical): 620 V nominal voltage must be maintained within the specified range (558 V – 682 V)
• Maximum AC Volts: 385 V continuous AC rating
• Number of Circuits: Single circuit configuration
• Mounting Type: Through-hole technology
• Package Form Factor: Disc geometry with compatible dimensions
• Operating Temperature: Functional range of -40°C to 85°C minimum
• Regulatory Compliance: RoHS3 and REACH compliance required

The ERZ-V20D621 (Panasonic Electronic Components) meets these substitution criteria with identical varistor voltage specifications, equivalent AC voltage rating, and compatible through-hole disc packaging. Differences in surge current capacity (7.5 kA vs. 10 kA) and energy absorption (382 J vs. 370 J) represent acceptable trade-offs for equivalent voltage protection functionality.

Parameter Comparison

Engineering Selection Recommendations

Both the V385LC40CP and ERZ-V20D621 are Active status components with full RoHS3 and REACH compliance. Selection between these parts should be based on the following criteria:

V385LC40CP (Littelfuse) is the primary choice when maximum surge current capacity (10 kA) and extended low-temperature operation (-55°C) are required. This part provides higher energy absorption (370 J) and is optimized for high-stress transient suppression applications.

ERZ-V20D621 (Panasonic) is suitable as a substitute when surge current requirements are 7.5 kA or lower and operating temperature range of -40°C to 85°C is acceptable. The slightly larger disc diameter (22.50mm vs. 20mm) must be verified for PCB layout compatibility. Energy absorption (382 J) is marginally higher, providing equivalent protection in moderate surge environments.

Both parts maintain identical varistor voltage specifications (620 V nominal) and maximum AC voltage rating (385 V), ensuring equivalent voltage clamping performance in circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can ERZ-V20D621 directly replace V385LC40CP in all applications?

A: Direct substitution is valid when circuit surge current does not exceed 7.5 kA and operating temperature remains within -40°C to 85°C. The larger disc diameter (22.50mm) requires verification against PCB layout constraints. Voltage protection performance is equivalent due to identical varistor voltage specifications.

Q: What is the significance of the 2.5 kA difference in surge current rating?

A: The V385LC40CP handles 10 kA surge events, while ERZ-V20D621 is rated for 7.5 kA. This difference affects component reliability under high-energy transient conditions. Applications with predictable surge currents below 7.5 kA can use the Panasonic substitute without performance degradation.

Q: Are there package dimension compatibility issues?

A: The V385LC40CP uses a 20mm disc package, while ERZ-V20D621 uses a 22.50mm disc package. Both are through-hole mounted, but the larger diameter of the substitute requires verification that PCB pad spacing and component clearances accommodate the increased size.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both V385LC40CP and ERZ-V20D621 are RoHS3 compliant and REACH unaffected, meeting current environmental and hazardous substance regulations for industrial and commercial applications.

Q: What is the operating temperature consideration for substitution?

A: The V385LC40CP operates from -55°C to 85°C, while ERZ-V20D621 operates from -40°C to 85°C. Applications requiring operation below -40°C must use the Littelfuse part. For standard industrial temperature ranges (-40°C to 85°C), both parts are functionally equivalent.