What is a film capacitor, and what are the differences between film capacitors and electrolytic capacitors? 3

3. Polyester film capacitor: using polyester film as the insulating substrate, the electrode is aluminum foil or vacuum deposited metal film, with high capacitance value and low price, suitable for some low-end electronic products.

4. Polypropylene film capacitor: Using polypropylene film as the insulating substrate and vacuum deposited metal film as the electrode, it has high capacitance value and low price, and is widely used in some low-end electronic products.  diode

5. Ceramic film capacitor: Using ceramic film as the insulating substrate, the electrode is a metal electrode printed on a ceramic tile, with high capacitance value and low price, suitable for some low-end electronic products.

7、 The difference between film capacitors and electrolytic capacitors

1. Different structures: Thin film capacitors are mainly formed by using metal or semiconductor films as electrodes and insulating layers as dielectrics to form capacitors; Electrolytic capacitors are mainly composed of two metal electrodes and an electrolyte.

2. The working principle is different: the working principle of thin film capacitors is to use the electrostatic field of metal or semiconductor thin films to form capacitors; The working principle of electrolytic capacitors is to utilize the ionization and polarization phenomena of electrolytes under the action of an electric field to form capacitors.

3. Different capacitance values: Thin film capacitors have smaller capacitance values, while electrolytic capacitors have larger capacitance values.

4. The stability of capacitance values varies: thin film capacitors have relatively stable capacitance values, while electrolytic capacitors have lower stability.

5. Different volumes: Thin film capacitors have a smaller volume, while electrolytic capacitors have a larger volume.

6. Polarity difference: Electrolytic capacitors have polarity, while thin-film capacitors have no polarity.

7. Cost difference: Thin film capacitors have lower costs, while electrolytic capacitors have higher costs.  diode

8、 Summary

Thin film capacitors are widely used in the field of electronic devices due to their simple structure, small size, light weight, and high reliability. The preparation process mainly includes steps such as substrate selection, electrode deposition, dielectric deposition, electrode fabrication, and on-chip connection. Its application areas include power management, analog circuits, digital circuits, communication circuits, etc. Thin film capacitors and electrolytic capacitors have significant differences in capacitance value, accuracy, volume, stability, reliability, cost, and other aspects. In practical circuit design, it is necessary to select suitable capacitors according to specific requirements.