BN154G0684J--

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Film capacitors, also known as polyester capacitors, are a type of capacitor which uses thin polyester film as a dielectric. BN154G0684J is one of the products of this type. As the dielectric, this design is characterized by the relatively high insulation resistance, stability, capacitance, and low cost. Furthermore, they provide lower dissipation and higher self-healing characteristics.

Application Field

BN154G0684J is primarily used in high-frequency switching power supplies and communications equipment. It can handle the very high-frequency, high-voltage, and minute leakage current. They are also used for digital and TV displays, LCD backlighting, and stroboscope applications. Moreover, it can be used for signal filtering and storage, such as low pass, high-pass filtering, trapping, and coupling circuit.

Working Principle

A film capacitor is basically a capacitor made of multiple layers of film and foil. The metal foil, which can be either aluminum, copper, or chromium, forms the electrodes and is separated by a dielectric material such a polyester film. The film is micro-porous, so it offer more surface area than an electrolytic capacitor, thus increasing the capacitance per unit volume. To increase its capacitance, a chemical is treated on the electrodes, usually an acrylic resin or a silicone oil, which improves the lifespan of the capacitor. The film capacitor is then wound with a non-conductive material, such as silk or paper, to complete the design.

When electrical current flows through the capacitor, the dielectric material causes the deposition of charges on each plate, which creates a capacitor field. Since the charges on each plate are still present even when the current is not present, the capacitor has a “memory” and can store energy for later use. It is also worth noting that the capacitance is affected by the capacitance of the film, which depend on the material and thickness.

Conclusion

The BN154G0684J is a type of capacitor which is a combination of metal foil plates and a dielectric material, such as polyester film, to create a capacitor. Primarily used in high-frequency switching power supplies and communications equipment, the working principle of the BN154G0684J is based on the electrostatics principle, where two metal plates separated by a non-conductive insulator creates an electric field for storing and transferring energy. With its high insulation resistance, stability, and capacitance, it can withstand high-frequency applications and has a longer lifespan than other capacitors.

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