Ceramic Capacitor Overheating

Common examples are earthenware porcelain and brick.

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. 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 two most common types of ceramic capacitor are. All other capacitors i ve touched were always cool even when used on a warm pcb.

Leakage current is another factor which has to be considered in capacitor reliability. 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. Following is the symbol for ceramic capacitor. 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. 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. So i m getting 45 5 c on the cap of the capacitors.

Ceramic disc capacitors these are often used as safety capacitors in electromagnetic interference suppression applications.