Product category:
Circuit Protection Devices
News Release from: AVX | Subject: AVX USB varistors
Edited by the Electronicstalk Editorial
Team on 01 February 2008
Varistors protect data lines
The multilayer ceramic varistors feature nonlinear, bidirectional voltage-current characteristics similar to back-to-back Zener diodes and an EMC capacitor in parallel.
AVX has developed the USB varistors designed to protect the high-speed data lines that make up the Universal Serial Bus (USB) against ESD transients Their fast turn on times and very low capacitance make the varistors suitable for protecting high-speed serial data lines
This article was originally published on Electronicstalk on 27 Jan 2004 at 8.00am (UK)
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The zinc-oxide (ZnO) based, multilayer ceramic varistors feature nonlinear, bidirectional voltage-current characteristics similar to back-to-back Zener diodes and an EMC (electromagnetic compatibility) capacitor in parallel.
By effectively integrating this functionality into a single device the varistors require significantly less PCB real-estate.
Available as 0603 and 0402 discretes or 0405 dual, 0508 triple and 0612 quad arrays, the varistors offer many electrical advantages over zener diodes in USB applications, including better repetitive strike capability, higher in rush current capability, faster turn-on-time and inherent EMI attenuation.
Other features include a DC working voltage of less than 18V, an AC working voltage of under 14V, a transient energy rating of 0.015J, a peak current rating of 4A, a typical capacitance of 10pF or less, an operating temperature of -55 to +125C, plated tin over nickel terminations and low clamping and operating voltages.
Typical applications are USB and Firewire data bus lines, I/O lines, 10/100/1000 Ethernet, video card data lines, laptops, PDAs and LCD monitors. Request a free brochure from AVX ...
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