Patent ID: 8421582

Claim:
An ESD protection device comprising: opposed electrodes including an opposed electrode on a first side and an opposed electrode on a second side, the opposed electrodes including portions opposed at a distance to each other in a ceramic base material; and a discharge auxiliary electrode in contact with each of the opposed electrode on the first side and the opposed electrode on the second side, the discharge auxiliary electrode being arranged to provide a bridge from the opposed electrode on the first side to the opposed electrode on the second side; wherein the discharge auxiliary electrode includes metallic particles, semiconductor particles, and a vitreous material, and bonds are provided through the vitreous material between the metallic particles, between the semiconductor particles, and between the metallic particles and the semiconductor particles, the metallic particles have an average particle diameter X of about 1.0 μm or more, and a relationship between a thickness Y of the discharge auxiliary electrode and an average particle diameter X of the metallic particles satisfies about 0.5≦Y/X≦ about 3.