Patent ID: 9590417
Date: 2017-03-07
CPC Classifications: H01T,H02H,H05K

Claim:
1. An ESD protective device comprising: an insulating multilayer substrate including a plurality of insulating layers laminated to each other; a cavity portion formed inside the insulating multilayer substrate; at least one pair of discharge electrodes having facing portions which are formed on a surface of the insulating multilayer substrate defining the cavity portion and which face each other with a space provided there between; external electrodes which are formed on surfaces of the insulating multilayer substrate and which are connected to the discharge electrodes; and at least one conductor portion which is formed inside the ceramic multilayer substrate other than the cavity portion and covers an entire area of a facing region in which the front ends of the facing portions of the discharge electrodes face each other when viewed in a lamination direction in which the insulating layers of the insulating multilayer substrate are laminated, in a facing direction in which the facing portions of the discharge electrodes face each other, or in a direction perpendicular both to the lamination direction and the facing direction.