Static electricity countermeasure component

1. An electrostatic discharge protection component comprising:

a ceramic insulating substrate,

a varistor unit composed of a varistor layer and an internal electrode, which are sintered and integrated on the ceramic insulating substrate, and

at least a pair of external electrodes provided on the varistor unit, and wherein the varistor unit is formed with a varistor,

wherein a material of the varistor layer contains zinc oxide as a main component and the ceramic insulating substrate is an alumina substrate containing copper oxide having a content of 0.1% or less by weight ratio.

2. The electrostatic discharge protection component of claim 1 , wherein the external electrodes are provided to be sintered and integrated on the same surface of the varistor unit.

3. The electrostatic discharge protection component of claim 1 , wherein the ceramic insulating substrate is two or more times as thick as the varistor unit.

4. The electrostatic discharge protection component of claim 1 , wherein a protective film is formed on an upper surface of the varistor unit except a region, in which the external electrodes are formed.

5. The electrostatic discharge protection component of claim 1 , wherein the ceramic insulating substrate has a built-in inductor and the inductor is connected electrically to the varistor of the varistor unit.

6. The electrostatic discharge protection component of claim 5 , wherein the varistor comprises two varistors and a πshaped filter is constructed by the varistors and the inductor.

7. The electrostatic discharge protection component of claim 5 , wherein the varistor and the inductor are provided in plural to construct a multi-stage low-pass filter.