MONOLITHIC VARISTOR AND METHOD OF MANUFACTURING THE SAME

摘要

PURPOSE: A monolithic varistor is provided to prevent generation of defect in a varistor main body and growth of a plating film in an undesired part of the varistor main body which are caused by plating solution. CONSTITUTION: In order to form an external electrode(5), the following are formed by heat treatment; a first layer(6) containing metal component and glass component on the outer surface of a varistor main body(4), a second layer(7) containing glass component and a first insulating layer(11) on the first layer(6) and the outer surface of the varistor main body(4) exposed from the first layer(6), a third layer(8) containing glass component and a second insulating layer(12) on the second layer(7) and the first insulating layer(11), and a fourth layer(9) containing metal component on the third layer(8). A fifth layer(10) is formed on the fourth layer(9), by using an electroplating film composed of metal excellent in solderability. Metal component contained in the fourth layer(9) is diffused in the second layer(7) and the third layer(8) in the course of heat treatment.