Multilayer ceramic TVS devices provide state-of-the-art overvoltage protection & EMI

AVX Corporation has introduced the new TransFeed Automotive Series, which combines the electrical characteristics of its TransGuard Transient Voltage Suppressors (TVS) and its Feedthru Capacitors in a single chip to provide state-of-the-art overvoltage circuit protection and EMI reduction over a much broader range of frequencies than comparable devices.

Featuring a multilayer ceramic construction in a feedthru configuration, the new TransFeed Automotive Series is able to respond quickly to transient events and provides significant EMI attenuation when in the off state. Qualified to AEC-Q200, the series is intended for automotive applications, including: drive by wire, dimming mirror circuits, filtering/protection on microcontroller I/O lines, filtering/protection on interface I/O lines, power line conditioning, power regulation, and LCD dashboard drivers, among others.

“The new Automotive TransFeed Series varistors provide bi-directional ESD protection coupled with low parallel induction, decoupling capabilities for high di/dt environments, and significant noise reduction in digital circuits,” said Jiri Machanicek, Product Manager at AVX. “These devices are suitable for automotive applications in which designers are concerned with both transient voltage protection and EMI attenuation, either due to the electrical performance of their circuits or required compliance with EMC regulations.”

The reduction in parallel inductance typical of the feedthru chip construction (vs. the construction of standard TVS or ceramic capacitor chips) provides the TransFeed Automotive Series with two advantages, the first of which is faster turn-on time. Measured response times for TransFeed devices range from 200-250pSec, which is less than half that of the fastest bipolar TVS solutions available. The second electrical advantage of lower parallel inductance coupled with optimal series inductance is enhanced attenuation characteristics. TransFeed Automotive Series varistors exhibit excellent attenuation at high self-resonant frequency with a much flatter roll-off characteristic than comparable devices, resulting in EMI filtering over a much broader frequency spectrum.

TransFeed Automotive Series varistors feature a working voltage range of 5.6-18VDC, a clamping voltage range of 18-50V, an energy rating of 0.05-0.3J, a peak current of 15-120A, and a maximum feedthru current of 0.2-1A. Rated for use in temperatures ranging from -55ºC to +125ºC, the series is available in 0805 and 0612 cases with Ni Barrier/100% Sn terminations.


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