AVX Corporation has introduced its new TransFeed Automotive Series, which combines the company’s TransGuard Transient Voltage Suppressors (TVS) and its Feedthru Capacitors in a single chip. This mix has the potential to offer overvoltage circuit protection and EMI reduction over a much broader range of frequencies than similar devices. The design features a multilayer ceramic construction in a feedthru configuration, as a result the new TransFeed Automotive Series can respond to transient very quickly and can provide significant EMI attenuation when in the off state. Qualified to AEC-Q200, the series is ideal 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 a high level of bi-directional ESD protection coupled with low parallel induction, excellent decoupling capabilities for high di/dt environments, and significant noise reduction in digital circuits,” said Jiri Machanicek, Product Manager at AVX.
“These devices are ideal 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 these devices with two significant advantages, the first of which is faster turn-on time. Measured response times is from 200-250pSec, which the company claims 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.
These varistors offer a high leve of 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.
The devices 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.
A datasheet for is available at: http://www.avx.com/docs/Catalogs/Autotransfeed.pdf
AVX Corporation
