BFC237518243

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Film Capacitors

A film capacitor, or plastic film capacitor, is a capacitor consisting of a plastic film as the dielectric, typically polyester or polycarbonate, or polypropylene or polystyrene, aluminum foil as electrodes on each side and a substrate (or, lead frame) for the electrodes. The two metallic electrodes usually foil are separated by a dielectric film of polycarbonate, polypropylene, polyester, polystyrene, polyvinylidene fluoride, polyphenylene sulphide or other plastic film. The electrodes are typically anodic aluminum, but may also be metallized to reduce the amount of foil used, produce a thinner construction and provide better electrical characteristics.

BFC237518243 Application Field and Working Principle

The BFC237518243 is a polypropylene film capacitor used in high-frequency switching applications such as Class D audio amplifiers. It has a capacitance of 0.22uF and a dissipation factor of 0.03%. Its maximum AC voltage rating is 250VAC and it has a working temperature range of -40°C to +105°C.

The working principle of BFC237518243 is based on the electrical characteristics of the electrical dielectric between the electrodes. The polypropylene film is a dielectric material that is highly effective in providing electrical insulation between two electrodes. When an AC voltage is applied to the capacitor, the alternating electric field creates an electric polarization of the dielectric material which results in a charge being stored in the capacitor. The stored chargecharges up the dielectric material and induces an opposing electrostatic field which acts to oppose the polarization of the material and reduce the electrical field.

The capacitance of the capacitor is determined by the thickness of the film and its dielectric constant. The dielectric constant is the ratio between the total induced charge of the material, divided by the applied voltage. The dielectric constant of polypropylene is 2.3, which is higher than that of other dielectric materials. This higher dielectric constant allows for a higher capacitance and a reduced dissipation factor.

The maximum AC voltage rating of 250VAC indicates the maximum voltage that can be applied to the capacitor before it begins to break down. When this voltage is applied, the dielectric material starts to break down and the electrodes become electrically charged. This is known as dielectric breakdown. The breakdown voltage can cause the capacitor to fail if the applied voltage exceeds its maximum rating. The lower the breakdown voltage of the capacitor, the more effective it is in reducing losses due to dielectric breakdown.

The working temperature range of -40°C to +105°C of the BFC237518243 indicates that it can function effectively even in extreme temperatures. Low temperatures can reduce the capacitance of the film capacitor due to increased resistance of the dielectric material. However, the BFC237518243 is designed to perform effectively and consistently even at extreme temperatures.

In summary, the BFC237518243 is a polypropylene film capacitor used in high-frequency switching applications such as Class D audio amplifiers. It has a capacitance of 0.22uF and a dissipation factor of 0.03%. Its maximum AC voltage rating is 250VAC and it has a working temperature range of -40°C to +105°C. The capacitance of the capacitor is determined by the thickness of the film and its dielectric constant. The breakdown voltage of the capacitor is also important as it determines the maximum voltage that can be applied before it begins to break down.

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