Film capacitors are a type of capacitor that utilize a thin plastic film as the dielectric – the insulating material that separates two conductors. They are primarily employed in electronic circuits to store and release electrical energy, block direct current while allowing alternating current to pass, and filter or smooth the output of power supplies. Due to their outstanding performance in applications requiring high-reliability and long-term stability, such as power electronics and radio frequency circuits, they are extensively used in the electronics industry.
Specific types of Film Capacitors are designed for specific applications. For instance, Polyester Film capacitors are preferred in applications that call for good stability, low moisture absorption, and excellent resistance to temperature changes, whereas Polypropylene Film capacitors are favored in frequency-sensitive applications due to their low dielectric loss. Major uses for these capacitors can be found in power supplies, audiovisual equipment, telecommunication devices, and many more. Renowned manufacturers of Film Capacitors include companies like KEMET, Panasonic, and Vishay.
