FFB54D0117K--

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Film Capacitors

Film capacitors, also known as film dielectric capacitors, are a type of capacitor made of thin plastic film as the dielectric. An electric facial is being formed between two conductive layers and placed onto a flat surface. Film capacitors are known for their very stable capacitance and electrical properties. They are commonly found in a wide range of electronic applications including RF circuits, medical, military, audio, automotive, telecommunications and switching power supplies.

The type code FFB54D0117K identifies a film capacitor with a maximum working voltage of 4.5kV, a manufactured tolerance of ±9.9%, a capacitance value of 1170pF, and capacities range up to 17kV. Film capacitors are composed of two metal layers and a dielectric film between them. The capacitance of a film capacitor is determined by its electrode area, the plate spacing and the permittivity of the dielectric film.

The most commonly used dielectric material for film capacitors is polyester (PET, Mylar), and often include other materials such as polycarbonate (PC), polypropylene (PP), polystyrene (PS), and ceramic (COT). Some film capacitors also use nylon-dielectric, Teflon and thermoplastic materials. On the other hand, The outer layer of the film capacitor consists of two different sheets of metal, with the sign of the capacitor printed on the top sheet.

Using the correct application, film capacitors can have a wide range of uses and benefits. Generally, they are used in signal filtering and coupling applications, high frequency circuits and power supply circuitry. Due to the stability provided by the dielectric, film capacitors can also be used to reduce high frequency interference. Another use of film capacitors is in the reduction of electrical noise, with applications in radio, audio, measurement and medical sectors.

The working principle of a film capacitor is relatively simple and revolves around the electrostatic field principle. Like most capacitors, the capacitance is determined by the surface area of the soldered electrodes and the gap between them. As a voltage is applied to the capacitor, a charge builds up on the metal electrodes and creates an electrostatic field around the dielectric medium (film). As the applied voltage increases, the amount of charge stored increases accordingly.

This stored charge, known as capacitance, is proportional to the area of the film medium and its dielectric constant. Generally speaking, the higher the dielectric constant of the film material, the larger the capacitance will be. As the applied voltage increases, the electric field between the electrodes will become stronger, and the capacitance of the film capacitor will increase. Due to these properties, film capacitors are ideal for accurate and stable frequency filtering applications.

Film capacitors also have excellent temperature stability and low temperature coefficient, which allows them to be used in wide range of temperatures. Film capacitors are also highly reliable and often have high insulation resistance which further increases their durability. However, the low capacitance of film capacitors limits them in high voltage applications, since the charge generated at high voltage levels would be too small.

In conclusion, FFB54D0117K is a type of film capacitor, capable of filtering and coupling signals and reducing high frequency interference. Its stability and temperature coefficient also makes it well suited for power supply and RF circuit applications. Film capacitors have a relatively simple working principle, however, their low capacitance limits their uses in high voltage applications.

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