metallifilmivastuksia

Metallifilmivastuksia, often translated as metallized film capacitors, are a type of capacitor that utilizes a thin metallized film as the dielectric material. This film is typically made from polyester (like PET or PEN) or polypropylene, which is then coated with a very thin layer of metal, such as aluminum or zinc, through a vacuum deposition process. This metallized film serves as both the electrodes and the dielectric layer, wound tightly together to form the capacitor element.

The primary advantage of metallized film capacitors is their self-healing property. If a small breakdown occurs in the dielectric, the metal electrode in that specific area vaporizes due to the localized heat, effectively isolating the faulty spot and preventing further damage. This significantly increases the reliability and lifespan of the capacitor compared to other types. They also offer excellent volumetric efficiency, meaning they can store a significant amount of capacitance in a small physical size.

Metallifilmivastuksia are widely used in various electronic applications due to their good performance characteristics, including power factor correction, filtering, energy storage in power supplies, and in audio circuits where their low distortion is advantageous. They are known for their stability over temperature and frequency, making them a versatile choice for many demanding applications. Their construction allows for high voltage ratings and good surge current handling capabilities.