KYOCERA AVX adds 48V multilayer varistors

Key Takeaways

• KYOCERA AVX introduces new high-temperature, automotive-grade multilayer varistors for 48V power supply systems
• TransGuard VT Series devices provide bidirectional overvoltage protection and EMI/RFI attenuation
• Operating temperatures range from -55°C to +175°C with no derating
• Devices are qualified to AEC-Q200, IEC 61000-4-2, and ISO 10605 standards

Introduction to TransGuard VT Series

KYOCERA AVX has expanded its TransGuard VT Series with the addition of new high-temperature, automotive-grade multilayer varistors designed for 48V power supply systems. These devices are zinc-oxide ceramic semiconductor devices that offer bidirectional overvoltage protection and EMI/RFI attenuation in surface-mount packages.

Features and Benefits

The TransGuard VT Series devices are designed to reduce the need for discrete MLCCs, which can help lower BOM cost and save board space. They support operating temperatures from -55°C to +175°C with no derating across that range and are qualified to AEC-Q200, IEC 61000-4-2, and ISO 10605 standards. The devices also carry a Class 6 human-body model ESD rating and an MSL 1 moisture sensitivity rating, meaning they can withstand more than 25,000V ESD and do not require special dry packing, handling, or prebaking before reflow soldering under specified conditions.

Comparison of TransGuard VT Series Devices

Applications and Target Markets

The TransGuard VT Series devices are designed for protection against ESD, load dump, and voltage spikes in automotive, industrial, and transportation systems operating at elevated temperatures. Target applications include electric vehicles such as e-bikes, e-scooters, golf carts, passenger vehicles, and commercial vehicles, along with charging stations.

Additional Features and Packaging

Several TransGuard VT Series part numbers, including some of the new 48V System VT Series MLVs, are available with FLEXITERM terminations. These terminations are designed to withstand vibration, up to 5mm of board flexure, and up to 3,000 temperature cycles to 150°C without internal cracking. The devices are also available in six case sizes from 0603 to 2220, with RoHS-compliant matte tin-plated terminations with nickel barriers and tape-and-reel packaging in quantities of 1,000, 4,000, or 10,000 parts.

Bottom Line

The introduction of the new 48V System VT Series MLVs by KYOCERA AVX expands the company's portfolio of high-temperature, automotive-grade multilayer varistors. With their bidirectional overvoltage protection and EMI/RFI attenuation capabilities, these devices are well-suited for a range of applications, including electric vehicles and charging stations. Their high operating temperatures, low leakage, and high current and energy handling capabilities make them an attractive option for designers of automotive and industrial systems.