BFC247955273

Film Capacitors

Film capacitors, also known as plastic film capacitors, are passive electronic components composed of a thin plastic film dielectric with two or more conductive layers deposited on opposite surfaces of the film. These capacitors use a dielectric plastic film to separate the conductive surfaces. Film capacitors are categorized by the type of film used, the presence of metallized film electrodes, and component package type.

BFC247955273 is a film capacitor with polypropylene as the dielectric material. The capacitor is epoxy molded in an isolation-plastic case without lead pins (no polarity). It has good moisture resistance and long-term stability.

Application Fields

• Power factor correction in electronic ballasts and other lighting systems.
• DC/DC converters.
• UPS and LEDs for automotive and consumer applications.
• Equipment for musical instruments and audio applications.
• High voltage transformers.

Working Principle

The basic structure of a film capacitor is two metal electrodes separated by a dielectric film. By applying a voltage between the electrodes, electric charges are accumulated on each of them (forming a "charge-storage" capacitor). This effect is similar to that of a simple capacitor composed of two metal electrodes separated by air.

The operation of a film capacitor is mainly based on the "charge-storage" principle, in which the presence of the dielectric film, separating the electrodes, increases the capacity of the capacitor. The dielectric material determines the capacitance of the capacitor and also influences its other characteristics, such as the ability to withstand high voltages.

In addition, the dielectric material can also affect the self-healing capabilities of the capacitor, as well as its resistance to environmental factors such as temperature and humidity. This makes film capacitors well-suited for applications in which stability and reliability are key criteria.