The Many Benefits of Film Capacitors

Film capacitors are common electronic components used in electronic products. A film capacitor uses metal foil as the electrode, which is overlapped with plastic films such as polyester, polypropylene, polystyrene, or polycarbonate from both ends, and then wound into a cylindrical structure. Film capacitors can be seen in many circuits. What are their advantages? What are their functions?

No.1 Small size.

Because a thin film is used as the dielectric, film capacitors can be made in very small sizes, so they do not take up too much space during installation. For example, KYET's CBB21X ultra-miniature polypropylene film capacitors, CL21X ultra-miniature polyester film capacitors, CL11 polyester capacitors, CL23B correction capacitors, and so on, can all be made especially small.

No.2 Large capacitance.

Compared with electrolytic capacitors, film capacitors have relatively smaller capacitance, but compared with ceramic disc capacitors and the like, film capacitors can be manufactured with relatively large capacitance values, meaning they can store more electrical energy.

No.3 Good stability.

The stability of film capacitors is significantly better than that of electrolytic capacitors, ceramic capacitors, etc. Their performance does not easily change due to long use time or environmental changes. They have a very long service life; a qualified film capacitor can generally be used for 5 to 10 years without major problems.

No.4 Self-healing property.

Film capacitors have a self-healing characteristic, which is a distinctive feature of film capacitors. It can be divided into discharge self-healing and electrochemical self-healing. Because of this characteristic, in many cases a damaged film capacitor does not need to be replaced; it can often heal itself, thereby reducing capacitor replacement costs, reducing maintenance costs, and reducing the time spent troubleshooting faults and downtime caused by machine failures.

No.5 High operating frequency.

Film capacitors can usually operate normally at relatively high frequencies. For example, KYET's CBB81 resonant capacitors and MMKP82 double-sided metallized capacitors can work stably in high-pulse circuits.

No.6

The insulating film of film capacitors usually has high dielectric strength and low leakage current, which can effectively reduce circuit power consumption and noise. The internal temperature rise of the capacitor is also very small, and it generates very little heat by itself.