Laminate-type positive temperature coefficient thermistor

摘要

A positive temperature coefficient thermistor has a non-heating portion which is not heated when a voltage is applied between first and second internal electrodes. The non-heating portion is provided in the approximate center of the positive temperature coefficient thermistor and is arranged to extend along a direction that is substantially perpendicular to a lamination direction of the positive temperature coefficient thermistor. The non-heating portion is arranged at least in the approximate center in the lamination direction of the portion of the laminate where the first and the second internal electrodes are arranged. Thus, a hot spot is reliably prevented from occurring inside the laminate when voltage is applied. As a result, the withstand voltage property is greatly improved. The non-heating portion may include a cavity provided in at least one thermistor layer or an opening or cut portion provided in the internal electrode.