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Film Capacitors

Film capacitors, also known as plastic film capacitors, refer to capacitors made of plastic film as the dielectric. The most common materials are polystyrene film, polycarbonate film, polypropylene film and polyester film. Its advantages are small size, low price, stability and insulation. Its main applications are AC filters, DC filters, bypassing, coupling, timing and automatic correction circuits, etc.

BFC246961273 Application Field and Working Principle

The BFC246961273 film capacitor is a non-inductive capacitor produced by US based Richco Electronics. It belongs to polyester film capacitor. It has the advantages of small size, good insulation property and reliability, high temperature resistance and anti-ultraviolet performance, and environmental protection design standards. It is mainly used in circuits with relatively small current and voltages, such as TV, audio equipment, car audio and other consumer electronics.

The working principle of the film capacitor is determined by two electrodes facing each other across an insulating dielectric medium. When the voltage on the electrodes is changed, the capacitor charges and discharges. When on DC voltage, every time a charge carriers’s electrons pass from one electrode to another, they build up a charge imbalance. This charge imbalance induces an electric field in the dielectric material. As the electrons pass from one electrode to the other, the electric field increases and causes a build up of counteracting static charge in the dielectric. This continues until the capacitance is equal to the charge applied. This ability to store electrostatic energy is what differentiates capacitors from resistors.

When a film capacitor is used for high frequency circuits, the dielectric absorbs and stores energy in the form of magnetic field. The thicker the dielectric, the greater the amount of energy stored. At higher frequencies, the electric field of the inductor affects the dielectric material, affecting the capacitance. This is why film capacitors are not suitable for high frequency applications.

Conclusion

BFC246961273 is a polyester film capacitor, which is mainly used in circuits with relatively small current and voltages, such as TV, audio equipment, car audio and other consumer electronics. Its advantages are small size, good insulation property and reliability, high temperature resistance and anti-ultraviolet performance, and environmental protection design standards. The working principle of the film capacitor is determined by two electrodes facing each other across an insulating dielectric medium. Film capacitors are not suitable for high frequency applications.

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