Sfi Electronics Technology Inc.

Jun-Nun Lin

Jie-An Zhu

Li-Yun Zhang

Cheng-Tsung Kuo

Wei-Cheng Lien

Ching-Hohn Lien

Xing-Guang Huang

A low-capacitance multilayer chip varistor has capacitance lower than 0.5 pF at 1 MHz and has a characteristic of resisting more than thousands of times of 8 KV electrostatic shock, which comprises a ceramic main body, outer electrodes disposed at two ends of the ceramic main body and inner electrodes disposed therein; the ceramic main body comprises inorganic glass of 3&#x2dc;50 wt % and semi-conductive or conductive particles of 50&#x2dc;97 wt % with particle size of more than 0.1 &#x3bc;m, and a layer of inorganic glass film covers the surface of semi-conductive or conductive particles, wherein the inorganic glass film contains semi-conductive or conductive particles of submicron or nanometer which is smaller than 1 micron, and the quantity contained of semi-conductive or conductive particles is less than 20 wt % of that of inorganic glass.

Ceramic material used for protection against electrical overstress and low-capacitance multilayer chip varistor using the same

A multilayer zinc oxide varistor without bismuth oxide system ingredients, and having variable breakdown voltages by controlling the thickness of the ceramic material; the varistor is bismuth-free and composed of zinc oxide as the primary constituent with alkaline earth element (Ba) as first additive, at least one of transition elements of Mn, Co, Cr, or Ni as second additives, at least one of rare earth elements of Pr, La, Ce, Nd or Tb as third additives and at least one of B, Si, Se, Al, Ti, W, Sn, Sb, Na, or K as rest additives, and the bismuth-free and zinc oxide based varistor exhibits an excellent ESD (Electro-Static Discharge) withstanding characteristic.

Multilayer zinc oxide varistor

Growing community of inventors

Zhubei, Taiwan

Jun-Nun Lin