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Polyester (PET) film capacitors

Polyester film capacitors are film capacitors using a dielectric made of the thermoplastic polar polymer material polyethylene terephthalate (PET).  They are manufactured both as metallized wound and stacked versions, as well as film/foil types. The polyester film adsorbs very little moisture, and this feature makes it suitable for "naked" designs without any further coating needed. They are the low-cost mass-produced capacitors in modern electronics, featuring relatively small dimensions with relatively high capacitance values. PET capacitors are mainly used as general purpose capacitors for DC applications, or for semi-critical circuits with operating temperatures up to 125  °C. The maximum temperature rating of 125 °C also allows SMD film capacitors to be made with PET films. The low cost of polyester and the relatively compact dimensions are the main reasons for the high prevalence of PET film capacitors in modern designs.

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