940C20P15K Capacitors

Film Capacitors

A 940C20P15K is a type of film capacitor, a device commonly used in a variety of electronic applications. Film capacitors are composed of a dielectric material, usually in the form of a thin dielectric film, and two conductive plates. These plates are separated by the dielectric film and are usually made from metalized, metallized, or Mylar flat films.

Application Field

Film capacitors are used in a wide range of applications such as electronic filters, power supplies, AC mains, transmitters, harmonic-reducing and audio/video applications, telecom repeaters, and airplane control systems. Due to their relatively low cost and good performance characteristics, film capacitors are used in a diverse range of products, including microphones, phones, loudspeakers, portable audio players, home cinema systems, and digital cameras.

Modern film capacitors are also increasingly sought after for their high dielectric strength and low ESR, as these characteristics enable them to perform well even under long-term, high temperature, and high voltage conditions. They are also able to provide a stable output even when exposed to extreme temperatures and vibration.

Working Principle

The operation of a film capacitor is fairly straightforward. When a voltage is applied between the two plates, electrons migrate from one plate to the other, creating an electric field. This electric field is what causes the capacitor to store energy, and it then gradually dissipates over time.

The amount of energy a film capacitor can store is determined by the values of the two plates and the dielectric material between them. As the voltage between the plates increases, more electrons are attracted, and the electric field between the plates becomes stronger. When the voltage is removed, the electric field dissipates and the capacitor will become discharged.

Additionally, film capacitors are designed with a higher dielectric strength than traditional electrolytic and ceramic capacitors. This means that they can safely handle higher voltages and greater frequencies than other capacitor types, making them ideal for more sensitive electronic applications.

In summary, film capacitors are reliable, cost-effective, and efficient devices, which makes them a popular choice for a wide range of applications. Their smaller size and high-performance characteristics enable them to be used in a variety of applications where space and reliability are paramount.