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It is a type of film capacitor, in this case of metallized paper or PM, but first we have to know a little that it is a film capacitor or film capacitor

Film capacitors, plastic film capacitors, dielectric film capacitors or polymer film capacitors, generically called "film layers", as well as power film capacitors, are electrical capacitors with an insulating plastic film as a dielectric, sometimes combined with paper as a carrier for the electrodes. .

These dielectric films, depending on the desired maximum voltage or dielectric strength, are stretched in a special process to an extremely thin thickness and then electrodes are attached to them. The electrodes of the film capacitors can be metallized aluminum or zinc applied directly to the surface of the plastic film, or a separate metal foil. Two of these conductive layers are wound into a cylinder-shaped winding, generally flattened to reduce mounting space on a printed circuit board or pcb, or layered as multiple individual layers stacked together, to form a capacitor body.

A related type of component is the power (film) capacitor. Although the materials and construction techniques used for high-power film capacitors are very similar to those used for ordinary film capacitors, capacitors with high to very high power ratings for applications in power systems and electrical installations. they are often classified separately, for historical reasons. As modern electronic equipment has acquired the ability to handle power levels previously the exclusive domain of "electrical power" components, the distinction between "electronic" and "electrical" power classifications has become less clear

Film capacitors are the most common types of capacitors and it belongs to a relatively large family of capacitors. The main difference between film capacitors and other types of capacitors lies in their dielectric properties. Some are listed below and to their left their different most common trade names:

  • Polyester (Mylar) MKT, MKTSH
  • Polystyrene PS
  • Polypropylene MKP, FKP
  • Polycarbonate PC
  • PM metallized paper

They are available in many values, tolerances from 10% to 0.01% and voltages up to 2000 volts.

In particular the PM or metallized film capacitor has a particularly high reliability against active and passive flammability, has excellent self-regeneration after overvoltage, a high degree of interference suppression due to good attenuation and low ESR. And it can be used at temperatures up to + 110ºC depending on the manufacturer. It is primarily used for class Y2 RFI applications to meet EMC regulations

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