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Film Capacitors

Film capacitors, or plastic film capacitors, are a type of capacitor that are made up of metalized film electrodes sandwiching a plastic film dielectric. The four basic types of film capacitors are polyester, polystyrene, polycarbonate, and polypropylene. These capacitors are used in a variety of applications, including pulse discharge, AC line filters, automotive electronics, computer circuitry, home entertainment systems, and many more.

BFC233621472 Application Field and Working Principle

The BFC Series are film capacitors manufactured by KEMET, and are composed of multiple layers of metallized film encased in a rectangular plastic box. The capacitors have a rated dielectric strength of 1.25kV, a rated temperature range of -55 to 125°C, and a capacitance range of 0.1 to 680 μF. The BFC Series are designed for use in power supplies, industrial circuit boards, audio equipment, electronic medical devices, and other demanding applications.

Film capacitors are designed to store an electric charge on a dielectric material and help reduce EMI/RFI interference. In combination with other components, they provide filtering, buffering, dampening, and impedance matching. The working principle of a film capacitor is based on a basic capacitor concept, wherein a dielectric material (typically a plastic film) is sandwiched between two electrodes (typically metalized film). When a voltage is applied to the capacitor, the positive and negative charges are transferred to the two electrodes, forming an electrical field around the capacitor. As the voltage increases, the dielectric stores more energy and provides a greater capacitance.

Physical Dimensions

The BFC features a rectangular box shape with a screw terminal design, allowing for quick and easy installation. The capacitance and voltage values are marked on the top of the unit for easy identification. The overall dimensions are 40.3(L) x 21(W) x 25 mm(H).

Advantages of Film Capacitors

Film capacitors offer a number of advantages over other types of capacitors, including high insulation resistance, high temperature stability, and longer lifespans due to their non-aging properties. Additionally, film capacitors can be designed to provide greater voltage ratings than other types, and they can be designed to have lower ESR than electrolytic capacitors.

The BFC Series of film capacitors provide a wide range of applications in modern-day electronics and industrial equipment. They offer high electrical stability, excellent thermal stability, and low ESR, as well as high capacitance and insulation resistance. With their wide range of uses and long lifespan, the BFC series of film capacitors are a great choice for many applications.

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