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, nonlinear, bidirectional voltage-current characteristics, high-current and -energy-handling capabilities, multi-strike capabilities, and 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. Combined, these features enable TransGuard Automotive Series varistors to provide reliable, state-of-the-art circuit protection from voltage transients caused by ESD, induction motor loads, module load dump, and other disruptions, which is increasingly vital as the number of electronic systems deployed in automotive applications continues to grow.
The new TransGuard Automotive Series load dump varistors are characterized by higher peak current ratings than the rest of the series (2,000A), which make 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 and 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, and are especially well suited for use in 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, and compliant with JASO D001 1994 and ISO 7637-2-2004 standards for protection against transient surges in the automotive industry. They are also RoHS compliant, lead-free compatible, and free of any other substances of very high concern (SVHCs).
