Ceramic varistor exhibits low leakage current
AVX
Ultraguard ceramic varistors
AVX has expanded its zinc oxide (ZnO) based varistor series to include an 18V-rated version that exhibits a low leakage current of 1uA maximum, which extends battery life in portable devices.
The Ultraguard Series multi-layer ceramic varistors feature non-linear, bi-directional voltage-current characteristics similar to back-to-back zener diodes, with an EMC (electromagnetic compatibility) capacitor in parallel.
The Ultraguard Series is claimed to offer many advantages over zener diodes, including better repetitive strike capability, higher inrush current capability, faster turn-on-time, and inherent EMI/RFI attenuation, all in a smaller footprint.
The robust Ultraguard Series also features multi-strike capabilities and will survive 1,000 strikes at 15kV contact ESD.
The Ultraguard Series multi-layer ceramic varistors are suitable for transient protection applications where extended battery life is required, including 'banked' or stacked LED drivers in backlit displays, fingerprint ID scanners, micro secure digital interfaces, camera modules, high-clock-speed ICs, battery-operated devices, medical and instrumentation, low-voltage power conversion circuits and power supervisory chip sets.
Further applications are also being found in optics such as laser diodes, laser diode drivers and serializer/deserializer devices.
The Ultraguard Series multilayer ceramic varistor 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 40pF through to 3,000pF.
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