Patent ID: 9077174
Filing Date: 2015-07-07
Classification: H01C,H01T,H02H

Abstract:
1. An ESD protection device which comprises: a ceramic base material; opposed electrodes provided with one-sided opposed electrode and an other-sided opposed electrode on a surface of the ceramic base material, the opposed electrodes being formed so as to be opposed to each other at a distance therebetween; and a discharge auxiliary electrode contacting each of the one-sided opposed electrode and the other-sided opposed electrode constituting the opposed electrodes, the discharge auxiliary electrode being placed so as to extend from the one-sided opposed electrode to the other-sided opposed electrode, wherein the discharge auxiliary electrode contains metal grains, semiconductor grains and a glass material, and each of the metal grains, each of the semiconductor grains, and each of the metal grains and each of the semiconductor grains are bound together, respectively, via the glass material, and an average grain size X of the metal grains is 1.0 μm or more, and a relationship between a thickness Y of the discharge auxiliary electrode and the average grain size X of the metal grains satisfies a requirement of 0.5≦Y/X≦3.