Varistors for ESD protection

14 May 2014 Circuit & System Protection

TDK has added a new series of EPCOS multilayer varistors to the CeraDiode family, which includes a highly compact and rugged varistor for the ESD protection of mobile equipment. This part has a footprint of 0,47 x 0,47 mm with a profile of just 0,1 mm in LGA packaging.

These new SMD protection components are available in EIA case sizes of 0402, 0201 and even smaller. This enables the production of varistors that are thus about 80% smaller than their predecessors and simultaneously offer highly reliable ESD protection.

The new CeraDiodes have an ESD immunity of 15 kV or 25 kV, depending on the type, which more than satisfies the higher requirements on the ESD protection of sensitive ICs. Their clamping voltage is only 70 V or 90 V at a pulse voltage of 8 kV (IEC-61000-4-2), depending on the type. Thanks to their low capacitance, the signal integrity of high-speed interfaces such as HDMI is not impaired.

TDK has achieved this breakthrough in the miniaturisation of its protection components by combining a new and extremely efficient semiconductor material with its micro core technology. The new ZnO material also possesses significantly more grain boundaries per volume, which increases the ability of the components to absorb ESD pulses by a factor of 50. These new micro core components can also be incorporated directly into 3D circuits and modules.

The main applications of the new CeraDiodes are in the RF circuitry of mobile communications devices as well as high-speed interfaces such as HDMI.

For more information contact Yolandi de Beer, Avnet Kopp, +27 (0)11 319 8600, [email protected], www.avnet.co.za

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