AVX has developed a zinc oxide-based varistor series that exhibits a low leakage current of 2uA maximum.
Designated the Ultraguard Series, the multilayer ceramic varistors feature non-linear, bi-directional voltage-current characteristics, similar to back-to-back zener diodes, and an EMC (electromagnetic compatibility) capacitor in parallel.
The Ultraguard varistor series offers many electrical advantages over zener diodes, including better repetitive strike capability, higher inrush current capability, shorter turn-on time and inherent EMI/RFI attenuation.
The varistors are significantly smaller, saving board space.
The Ultraguard Series comes in discrete chips available in 0402, 0603 and 0805 sizes, two-element packages in 0405 and 0508 sizes, and four-element 0612 packages.
Low- and high-capacitance versions are offered, ranging from 40 to 3,000 pF.
The varistor series is ideal for transient protection applications where power consumption is a primary concern.
These include high clock speed ICs, battery-operated devices, backlit displays, medical and instrumentation applications, low-voltage power conversion circuits and power supervisory chip sets.
Further applications are being found in optics, such as laser diodes, laser diode drivers, and serialiser and deserialiser devices.
http://www.electronicstalk.com/news/avx/avx188.html
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