Film capacitors are classified according to the type of plastic film: polyethylene-based capacitors (also known as Mylar capacitors), polypropylene capacitors (also known as PP capacitors), polystyrene capacitors (also known as PS capacitors), and polycarbonate capacitors.
The structure is the same as paper dielectric capacitors, and the dielectric is polyester or polystyrene, etc. Polyester film capacitor has high dielectric constant, small size, large capacity, better stability, and suitable for bypass capacitor. Polystyrene film capacitor, with low dielectric loss and high insulation resistance, but large temperature coefficient, can be used in high frequency circuits.
Advantages of film capacitors
200F 2.7V Super Capacitor 16V

200F 2.7V Super Capacitor 16V

Film capacitor is a kind of capacitor with better performance because it has many excellent characteristics. Its main characteristics are as follows: non-polarity, high insulation impedance, excellent frequency characteristics (wide frequency response), and very small dielectric loss. Based on these advantages, so film capacitors are used in a large number of analog circuits. Especially in the signal interconnection part, it is necessary to use capacitors with good frequency characteristics and very low dielectric loss to ensure that the signal is transmitted without too much distortion. Among all the plastic film capacitors, polypropylene (PP) capacitors and polystyrene (PS) capacitors have the most significant characteristics, but of course the price of these two capacitors is also relatively high. However, in order to improve the sound quality of audio equipment, the materials used in the parts have become more and more advanced, and the price is not the most important consideration, so PP and PS capacitors are used in audio equipment more and more frequently and in higher quantities.
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