Power Electronics
These AVX Corp varistors are suited for use in DC motor sensor and relay applications in addition to other harsh environment applications that can benefit from the impermeable glass encapsulation Image courtesy of AVX

These AVX Corp. varistors are suited for use in DC motor, sensor, and relay applications, in addition to other harsh environment applications that can benefit from the impermeable glass encapsulation. (Image courtesy of AVX).

New Ratings for Glass-Encapsulated Automotive Multilayer Varistors

AVX Corp. has added a new 1206 chip size and extensive new voltage, clamping voltage, and energy ratings to its Glass-Encapsulated TransGuard® and TransGuard Automotive Series multi-layer varistors. Both multi-layer varistor series are comprised of zinc oxide (ZnO) based ceramic semiconductor devices with non-linear, bi-directional voltage-current (VI) characteristics similar to those of back-to-back Zener diodes.

The varistors provide bi-directional overvoltage protection and EMI/RFI attenuation in a single SMT package, exhibit high current and energy handling capabilities, and are glass encapsulated to provide 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 excellent solderability; and the AEC-Q200 qualified TransGuard Automotive Series also delivers high energy absorption (load dump).

Both the Glass Encapsulated TransGuard and TransGuard Automotive Series multi-layer varistors are available in four chip sizes (1206, 1210, 1812, and 2220), with energy ratings spanning 0.4 to 12J, and with peak current ratings spanning 150 to 2,000A. These varistors are suited for use in DC motor, sensor, and relay applications, in addition to other harsh environment applications that can benefit from the impermeable glass encapsulation.

Newly rated for 16 85V, 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. Rated for 16 65V, with load dump energy rating up to 25J, the TransGuard Automotive Series is qualified to AEC-Q200 and designed for use in commercial, hybrid electric (HEV), plug-in hybrid electric (PHEV), and internal combustion engine (ICE) vehicles, as well as for electrical control unit (ECU), LIN BUS, and various other automotive applications.

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

Parts are available in 1206 to 2220 case sizes with 13 voltage ratings spanning 16 85V, energy ratings spanning 0.4 12J, and peak current ratings spanning 150 2,000A. In addition, TransGuard Automotive Series parts are available with load dump energy ratings spanning 1.5 25J and jump start voltage ratings spanning 27.5 48V.

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