Multilayer varistors are now rated for 16–85V

18th May 2015
Siobhan O'Gorman

AVX has added a 1206 chip size and extensive voltage, clamping voltage and energy ratings to its Glass Encapsulated TransGuard and TransGuard automotive series multilayer varistors. Comprised of zinc oxide based ceramic semiconductor devices with non-linear, bi-directional voltage-current characteristics similar to those of back-to-back Zener diodes, both multilayer varistor series provide bi-directional overvoltage protection and EMI/RFI attenuation in a single SMT package.

The multilayer varistors, which exhibit high current and energy handling capabilities, are glass encapsulated to provide enhanced resistance against harsh environments and processes, including acids, salt and chlorine flux. Both series also exhibit sub 1nS response times to ESD strikes, multi-strike capabilities, low leakage, and outstanding solderability. In addition, the AEC-Q200 qualified TransGuard automotive series delivers high reliability performance and high energy absorption (load dump).

Available in four chip sizes (1206, 1210, 1812, and 2220) with energy ratings spanning 0.4–12J and peak current ratings spanning 150–2,000A, both the Glass Encapsulated TransGuard and TransGuard automotive series multilayer varistors are suitable for use in DC motor, sensor and relay applications, in addition to a host of other harsh environment applications that can benefit from the impermeable protection that glass encapsulation provides. Newly rated for 16–85V, the Glass Encapsulated TransGuard series is also well suited for use in alarm, controller, smart grid and IC protection applications, in addition to a broad range of commercial, industrial and professional applications. Newly rated for 16–65V, with a load dump energy rating up to 25J, the Glass Encapsulated TransGuard automotive series is qualified to AEC-Q200 and suitable for use in commercial, hybrid electric, plug-in hybrid electric and internal combustion engine vehicles, as well as for ECU, LIN BUS and various other automotive applications.

RoHS-compliant and rated for operating temperatures ranging from -55 to +125°C, both the Glass Encapsulated TransGuard and TransGuard automotive series multilayer varistors are supplied with Ni/Sn plated terminations on 7” or 13” tape and reel for automated placement.

“Our Glass Encapsulated TransGuard and TransGuard automotive series varistors feature a unique, high-energy, monolithic multilayer construction that provides state-of-the-art bi-directional circuit protection from voltage transients caused by ESD, lightning, inductive switching, automotive related transients, and other disruptions, as well as EMI/RFI attenuation in the off-state,” said Jiri Machanicek, Technical Marketing Manager, AVX. “The significant addition of 36 new components, adding over 70% more options to the combined series, extends their unique, high-reliability circuit protection capabilities into a much broader range of even higher energy and higher current applications.”

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