Murata Manufacturing Co., Ltd.

Mayu Suzuki

Jun Adachi

Takayuki Tsukizawa

Takahiro Sumi

Sumiyo Nakamura

Katsumi Yasunaka

An ESD protection device includes an insulating substrate, first and second discharge electrodes in contact with the insulating substrate, the first and second discharge electrodes separated from each other and opposing each other, first and second outer electrodes on an outside surface of the insulating substrate, the first outer electrode being electrically connected to the first discharge electrode and the second outer electrode being electrically connected to the second discharge electrode, and a discharge auxiliary electrode spanning the first discharge electrode and the second discharge electrode in a region where the discharge electrodes oppose each other. The discharge auxiliary electrode includes semiconductor particles and metal particles. An average particle diameter of the metal particles is about 0.3 &#x3bc;m to about 1.5 &#x3bc;m. A density of the metal particles is greater than or equal to about 20 particles/50 &#x3bc;mand the semiconductor particles include an oxygen-containing layer on surfaces of the semiconductor particles.

Electrostatic discharge protection device and method of manufacturing the same

An electro-static discharge protection device includes a ceramic base material, first and second outer electrodes on the outer surface of the ceramic base material, a hollow portion inside the ceramic base material, a first discharge electrode including a first end portion electrically connected to the first outer electrode and a second end portion in the hollow portion, a second discharge electrode including a first end portion electrically connected to the second outer electrode and a second end portion spaced apart from the first discharge electrode in the hollow portion, and a discharge supporting electrode including silicon carbide and between the second end portion of the first discharge electrode and the second end portion of the second discharge electrode. The elemental alkali metal in the ceramic base material is about 3 percent by weight or less.

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Nagaokakyo, Japan

Mayu Suzuki