filmkapasitorit

Filmkapasitorit, also known as film capacitors or plastic film capacitors, are a type of capacitor that uses plastic film as the dielectric material. This dielectric is typically a very thin sheet of polyester, polypropylene, polycarbonate, or polystyrene. The conductive electrodes are usually made of metal foil or a thin metal layer deposited directly onto the film.

These capacitors are known for their stability, low loss, and high insulation resistance. They are commonly used in applications requiring precise capacitance values and good high-frequency performance, such as in timing circuits, filters, and resonant circuits. The choice of plastic film material influences the capacitor's characteristics, with polypropylene generally offering superior performance in terms of temperature stability and low dielectric loss, making it suitable for high-frequency applications. Polyester film is a more cost-effective option and is often used in general-purpose applications.

Film capacitors are manufactured by stacking layers of dielectric film and electrode material, or by winding a film and electrode strip into a cylindrical or rectangular form. They are available in a wide range of capacitance values and voltage ratings. Their robustness and reliability make them a popular choice in consumer electronics, automotive systems, and industrial equipment. Compared to ceramic capacitors, film capacitors generally offer higher capacitance values in a given size and are less prone to self-healing issues.