Film Capacitors

A MKT1817268256 capacitor is a type of film capacitor, which is an electronic component consisting of a thin plastic film between two metallic electrodes. The plastic film can be made from materials like polyester, polycarbonate, polystyrene, or polypropylene.

Application Field

Film capacitors are used in a variety of applications. They are popular in audio applications, as they can be used to develop and store high-frequency signals without distortion. They are also used in AC motor and lighting control, with their high galvanic isolation capabilities allowing them to be used in place of transformers or inductors. Film capacitors are also used as decoupling capacitors, power factor correction, and in the suppression of EMI/RFI radiation.

Working Principle

The working principle of a film capacitor is based on the capacitive properties of the plastic film. As the electric field is applied to the capacitor, the film acts as a dielectric, allowing it to store electrical energy in a given area. The capacitance of the capacitor depends on its size and the thickness of the film.

As the electric field is applied, electric charge accumulates on the inner surfaces of the metallic electrodes. This allows the capacitor to store more energy, up to a certain point, when the dielectric properties of the capacitance begin to diminish. This storage occurs in a non-linear fashion, developing two capacitance curves with different polarities.

The capacitance of the MKT1817268256 capacitor is temperature dependent, with a certain capacitance curve for a given temperature. This allows the capacitor to maintain a certain capacitance value even when the temperature oscillates. This is an important feature for use in high-temperature and low-temperature applications.