Ceramic Capacitor Overheating

This is first time i noticed something like that.

Ceramic capacitor overheating.

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. Leakage current is another factor which has to be considered in capacitor reliability. The two most common types of ceramic capacitor are. 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. Unfortunately i couldn t find capacitors of the same size so the modem is now outside of its plastic case. This heat along with the ripple current heating may lead to electrolyte evaporation and capacitor failure or thermal runaway. So i m getting 45 5 c on the cap of the capacitors.

All other capacitors i ve touched were always cool even when used on a warm pcb. 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. The crystallinity of ceramic materials ranges from highly oriented to semi crystalline vitrified and often completely amorphous e g glasses. Anyway i noticed that the capacitors are getting hot.

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.