Metal Film AC Capacitors

What is a metallized film capacitor?

Metallized film capacitors are made of two metallized films with plastic film as the dielectric. A very thin (~ 0.03 μm ) vacuum-deposited aluminum metallization is applied to one or both sides to serve as electrodes.

What are plastic film capacitors?

Plastic film capacitors are generally subdivided into film/foil capacitors and metalized film capacitors. Film / foil capacitors basically consist of two metal foil electrodes that are separated by an insulating plastic film also called dielectric. The terminals are connected to the end-faces of the electrodes by means of welding or soldering.

How do film capacitors work?

Film capacitors are build up by two electrodes (the capacitor plates) with plastic dielectric material in between. The type of electrode used determines whether the capacitor is a metalized film or film / foil type. In metalized types, the very thin electrode is evaporated on the plastic dielectric material.

What are the advantages of metallized film capacitors?

Advantages of this construction type are easy electrical connection to the metal foil electrodes, and its ability to handle high current surges. Metallized film capacitors are made of two metallized films with plastic film as the dielectric.

How do you know if a capacitor is a metalized film or foil?

The type of electrode used determines whether the capacitor is a metalized film or film / foil type. In metalized types, the very thin electrode is evaporated on the plastic dielectric material. The thin metalized electrodes have a thickness of approximately 10 nm to 50 nm.

What is a film/foil capacitor?

Film/foil capacitors or metal foil capacitors are made with two plastic films as the dielectric. Each is layered with a thin metal foil, usually aluminum, as the electrodes. Advantages of this construction type are easy electrical connection to the metal foil electrodes, and its ability to handle high current surges.

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Power Film Capacitor Application Guide

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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–paper capacitors–were commonly used; their manufacture started in 1876, and they were used from the early 20th century as decoupling capacitors in telecommunications (telephony).

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Applications and Technical Consideration for Metallized Film Capacitors

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Film Capacitors

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About Metal Film AC Capacitors

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