Automotive Electronics

Kyocera launches new load dump varistors

Fountain Inn, S.C. – Kyocera AVX, is a manufacturer of electronic components, supplying capacitors, resistors, inductors, and more for various industries including automotive, aerospace, and consumer electronics. It has released the new range of load dump varistors as an extension of its trusted TransGuard Automotive Series. These new varistors are designed to provide robust protection against voltage transients in automotive applications, safeguarding increasingly sophisticated electronic systems from potential damage.

About Load Dump Varistors

Load dump varistors are special voltage protectors designed for the harsh environment of car electrical systems. They act like tiny sponges, absorbing sudden surges in voltage caused by events like a battery disconnect. This safeguards other, more delicate electronics in the car from getting fried by these voltage spikes.

Key features of the new KYOCERA AVX varistors: (~ Gemini Google)

  • They can handle very high currents, up to 2,000 amps.
  • They are small and take up very little space.
  • They are very fast-acting and can respond to voltage spikes in less than a billionth of a second.
  • Make them reliable and ensure they last a long time, even in harsh environments.

KYOCERA AVX TransGuard Automotive Series varistors are innovative, zinc-oxide-based ceramic semiconductor devices that provide bidirectional overvoltage protection and EMI/RFI attenuation in a single, space-saving SMT package qualified to AEC-Q200 and backed by more than 20 years of proven performance in an array of automotive electronics. Key features include a unique monolithic multilayer construction with nonlinear, bidirectional voltage-current characteristics, high-current and -energy-handling capabilities, and multi-strike capabilities. It also boasts extremely fast, sub-nanosecond response times. They are also available with glass encapsulation for enhanced resistance against harsh environment hazards including acids, salts, and chlorite flux. TransGuard Automotive Series varistors provide reliable circuit protection from voltage transients. They safeguard against ESD, induction motor loads, module load dump, and other disruptions. This protection is increasingly crucial with the growing number of electronic systems in automotive applications.

The new TransGuard Automotive Series load dump varistors have higher peak current ratings than the rest of the series (2,000A). This makes them even more effective at providing reliable protection against high-energy automotive load dump transients. Load dump pulses simulate a sudden battery disconnection from the alternator. They cause the alternator to generate an overvoltage impulse that can damage sensitive ICs, which are also increasingly common in today’s automotive designs.

TransGuard Automotive Series varistors, including the new load dump varistors, are ideal for use in internal combustion engine, hybrid electric, and plug-in hybrid electric vehicles, including commercial vehicles. These components particularly suit CAN, LIN, and FLEXRAY modules, sensors, and induction motors. They are compact and lightweight, rated for operating temperatures extending from -55°C to +125°C with no derating. Moreover, they comply with JASO D001 1994 and ISO 7637-2-2004 standards, ensuring protection against transient surges in the automotive sector. They are also RoHS compliant, lead-free compatible, and free of any other substances of very high concern (SVHCs).

“The new TransGuard Automotive Series load dump varistors outperform similar competing parts in energy handling. They achieve this while utilizing a smaller footprint and maintaining all necessary parameters,” said Tyler Lagnese, Product Marketing Manager, KYOCERA AVX. “This allows design engineers to achieve significant performance improvements with the added benefit of space and weight savings. This is especially valuable considering the growing number of electronic systems deployed in automotive applications.”

The initial release of the new TransGuard Automotive Series load dump varistors consists of three standard part numbers (VCAS222016W400, VCAS222016Y390, and VCAS222016Z400) and their glass encapsulated counterparts (VGAS222016W400, VGAS222016Y390, and VGAS222016Z400), but additional codes are currently in development.

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