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Varistors boast ultralow leakage current

Posted: 06 Apr 2009 ?? ?Print Version ?Bookmark and Share

Keywords:variable resistor? varistor? leakage current ultralow? capacitor?

Varistor series

AVX Corp. has developed a zinc oxide-based varistor series that exhibits a low leakage current of 2?A 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 capacitor in parallel.

"Our UltraGuard varistor series offers many electrical advantages over zener diodes, including better repetitive strike capability, higher in rush current capability, faster turn-on-time and inherent EMI/RFI attenuation," said Sonja Brown, global product manager for circuit production products at AVX. "Furthermore, the varistors are significantly smaller, saving important board space."

The series comes in discrete chips available in 0402, 0603, and 0805 sizes; 2-element packages in 0405 and 0508 sizes; and 4-element 0612 packages. Low and high capacitance versions are offered ranging from 40pF to 3000pF.

The varistor series is designed 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 chipsets. Further applications are also found in optics such as laser diodes, laser diode drivers and serializer and deserializer devices.

Pricing starts at $0.11 each in quantities of 10,000 units.





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