Ceramic Capacitor Overheating

A sudden surge of voltage called overvoltage can cause a buildup of pressure in the sealed aluminum that makes up the outer casing of the capacitor which can lead to overheating damage to the capacitor s internal parts and possibly cause the capacitor to explode.

Ceramic capacitor overheating.

Anyway i noticed that the capacitors are getting hot. Leakage current is another factor which has to be considered in capacitor reliability. A ceramic capacitor is a fixed value capacitor where the ceramic material acts as the dielectric it is constructed of two or more alternating layers of ceramic and a metal layer acting as the electrodes the composition of the ceramic material defines the electrical behavior and therefore applications. This heat along with the ripple current heating may lead to electrolyte evaporation and capacitor failure or thermal runaway.

Unfortunately i couldn t find capacitors of the same size so the modem is now outside of its plastic case. All other capacitors i ve touched were always cool even when used on a warm pcb. Start capacitors work at voltage classifications that typically range from 370 to 440 v volts. So i m getting 45 5 c on the cap of the capacitors.

Following is the symbol for ceramic capacitor. A ceramic is any of the various hard brittle heat resistant and corrosion resistant materials made by shaping and then firing a nonmetallic mineral such as clay at a high temperature. A higher leakage current will cause a higher heat generation due to the power loss vi leakage where i leakage is the leakage current of the capacitor and v is the applied voltage. Common examples are earthenware porcelain and brick.

This is first time i noticed something like that.