BFC237059393

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Film Capacitors

Film capacitors, also known as plastic film capacitors, polyester film capacitors or paper-plastic capacitors, refer to a type of capacitor that is built with a plastic film as the dielectric insulation. They are used extensively in applications demanding high accuracy, stability, and quality. The most common examples of film capacitors are polyester, polyethylene naphthalate, polycarbonate, and polystyrene.

BFC237059393 is a type of plastic film capacitor designed for a wide variety of applications. This model is constructed of a metal foil electrode and polyethylene naphthalate (PEN) and polychlorotrifluoroethylene (PCTFE) film, giving it excellent performance characteristics. The capacitor is cylindrical in shape, with metalized layers on each side, and insulated segments between the layers. The layers are soldered onto the center filament providing a reliable connection.

Application Field

BFC237059393 is suitable for use in applications requiring high operating temperatures, such as lighting, LED lighting, HID lamps, ballasts, and automotive applications. The capacitor is rated for operation up to 250V and is especially suitable for high efficiency lighting or power electronic components operating at up to 180°C. It is also often used in Class D audio amplifiers, and high-frequency AC drives. This capacitor is also a good choice for high voltage smoothing applications where a low ESR, low ESL, and small size are important factors.

Working Principle

Film capacitors are capacitors that utilize a thin sheet of insulator such as plastic film to achieve a dielectric. This dielectric acts as a physical barrier to electron flow, while allowing an electrical field to form across the material. In the case of the BFC237059393, the insulator film is a combination of PEN and PCTFE. The metal film is then coated with an oxide material before being wrapped around the metal foil. The insulator film provides a stable dielectric constant which helps the capacitor to achieve a high accuracy when operated at high temperatures.

The construction of the BFC237059393 also includes a capacitive layer. The capacitive layer is an electrical field that exists between the positive and negative electrodes. When a voltage is applied across the electrodes, the capacitive layer acts as a conduit for electric current. The capacitive layer’s resistance to current flow is determined by its capacitance which is determined by the thickness of the film, the relative permittivity of the material and the area of the electrodes. This arrangement allows for a low Equivalent Series Resistance (ESR) and Equivalent Series Inductance (ESL), providing efficient operation even at high frequencies.

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