November 7, 2013

Multilayer varistors: Ultra-flat and compact varistors for ESD protection

  • Miniaturization leap by 80 percent; extremely low insertion height of 0.1 mm
  • 50 times higher absorption capability for ESD pulses
  • Attractive alternative to TVS diodes

TDK Corporation presents a new series of EPCOS multilayer varistors of the CeraDiode® family, which includes the most compact, flattest and most rugged varistor for the ESD protection of mobile equipment. It has a footprint of only 0.47 mm x 0.47 mm at an extremely low profile of 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 percent smaller than their predecessors and simultaneously offer extremely 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 new breakthrough in the miniaturization of its protection components by combining a new and extremely efficient semiconductor material with its innovative 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 further miniaturization, improved performance and low cost of the latest CeraDiodes makes them an ever more attractive alternative to TVS diodes.
The main applications of the new CeraDiodes are in the RF components of mobile communications devices as well as high-speed interfaces such as HDMI.

Main applications

  • Smartphones, tablets, LED lighting

Main features and benefits

  • Compact dimensions of 0402, 0201 and smaller
  • Low insertion height of 0.1 mm
  • High ESD immunity of up to 25 kV
  • Terminal voltages of less than 100 V at 8 kV (IEC-61000-4-2)

About TDK Corporation

TDK Corporation is a leading electronics company based in Tokyo, Japan. It was established in 1935 to commercialize ferrite, a key material in electronic and magnetic products. TDK's portfolio includes electronic components, modules and systems which are marketed under the product brands TDK and EPCOS, power supplies, magnetic application products as well as energy devices, flash memory application devices, and others. TDK focuses on demanding markets in the areas of information and communication technology and consumer, automotive and industrial electronics. The company has a network of design and manufacturing locations and sales offices in Asia, Europe, and in North and South America. In fiscal 2013, TDK posted total sales of USD 9.1 billion and employed about 80,000 people worldwide.

About TDK-EPC Corporation

TDK-EPC Corporation, a TDK group company, is the manufacturer of TDK’s electronic components, modules and systems and is headquartered in Tokyo, Japan. TDK-EPC was founded on October 1, 2009 from the combination of the electronic components business of TDK and the EPCOS Group. The product portfolio includes ceramic, aluminum electrolytic and film capacitors, ferrites, inductors, high-frequency components such as surface acoustic wave (SAW) filter products and modules, piezo and protection components, and sensors.

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