SFC44S20K391B-F

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Film Capacitors

Film capacitors are capacitors that use thin plastic films as a dielectric material. Such a capacitor has high voltage ratings and stability, excellent temperature and humidity characteristics, long life, and good insulation. It is widely used in the electronics industry.

SFC44S20K391B-F Application Field and Working Principle

SFC44S20K391B-F is a kind of metalized polyester film capacitors and its operating voltage is 575V.It is widely used in lighting ballast, power inverter filter, UPS, power system power supply filtering, and other power electronics products as a filtering capacitor. The main function of filter capacitor is to filter the rectified output of rectifier, reduce the ripple coefficient of power supply output and ensure the stability of the power supply operating voltage.In addition, sometimes the switch power supply has drives noise when it is switched on, so the filter capacitor also has the function of reducing switch power supply noise.In terms of working principle, when the alternating current flows through the two ends of the capacitor, it will be separated into the upper and lower two layers due to the dielectric material between the two plates of the capacitor, forming a high potential difference between the upper and lower two layers.At this time, a capacitor can be formed, because its two ends are subject to the same potential difference and can be charged.

SFC44S20K391B-F uses metalized polyester films as a dielectric material. Compared with other capacitors,It has many advantages, such as a large capacity range (ranging from 100 pF to 330 μF), good temperature stability, excellent moisture resistance, wide operating temperature (-55℃-85℃), low cost and long life (105°C,3000h).It also has good performance under special temperature and humidity conditions, such as high temperature and high humidity (85 °C,85%), low temperature and high humidity (20°C,85%), high temperature and low humidity (85 °C, 10%), and temperature cycling(-40°C/+75°C).These features make it ideal for power supply and filter capacitor of various electronic products.

It is clear that SFC44S20K391B-F is a kind of metalized polyester film capacitor and is mainly used in lighting ballast, power inverter filter, UPS, power system power supply filtering, and other power electronics products as a filtering capacitor. Its wide application fields, excellent performance and good cost performance make it an excellent electronic component in the current application.

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