What are film capacitors used for

Film capacitors, plastic film capacitors, film dielectric capacitors, or polymer film capacitors, generically called film caps as well as power film capacitors, are electrical capacitors with an insulating plastic film as the dielectric, sometimes combined with paper as carrier of the electrodes. The dielectric films,. . • Internals of film capacitors• Schematic picture comparison of film/foil vs. metallized film capacitor internals • Cross-section of a plastic film capacitor . • Available styles of film capacitors• Axial style for point-to-point and through-hole mounting • Radial style (single ended) for through-hole solder mounting on printed circuit boards . The following table identifies the most commonly used dielectric polymers for film capacitors. Also, different film materials can be mixed to produce capacitors with particular properties. The most used film. . The standardization for all , components and related technologies follows the rules given by the (IEC), a , non-governmental international . The IEC standards are. . The formula for capacitance (C) of a plate capacitor is: $${\displaystyle C=\varepsilon \cdot {{A} \over {d}}}$$ (ε stands for dielectric ; A for electrode surface area; and d for the distance between the electrodes). According to the. . Before the introduction of plastic films, capacitors made by sandwiching a strip of wax-impregnated paper between strips of metal, and rolling the result into a cylinder––were commonly used; their manufacture started in 1876, and they were. . The electrical characteristics, and the temperature and frequency behavior of film capacitors are essentially determined by the type of material that forms the dielectric of the capacitor. The following table lists the most important characteristics of the.

Film capacitors are widely used for DC fltering in power supplies. Their function is to smooth out the DC voltage waveform after rectifcation. -3 -55 -25 0 25 50 75 100 . Temperature (ºC) Capacitive Reactance (X. c) The reactance is the capacitor''s opposition to passing AC current.