BN154I0474K--

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Film Capacitors

Film capacitors, also known as plastic film capacitors or polyester capacitors, are capacitors that use a thin, polymer-coated, film as the dielectric material, rather than the traditional paper capacitors. The dielectric film is either Mylar or polyproylene, a polyester with very low permittivity, meaning that it can tolerate much higher temperatures than paper allows and providing excellent insulation.

The BN154I0474K (manufacturer part number) is an example of a film capacitor. The BN154I0474K is a 4.7uF capacitor rated to operate at a voltage of 250V and a temperature of -40 to +85C. It has a capacitance tolerance of 10% and an insulation resistance of 18Mega-Ohms.

Application field

The 4.7uF capacitor BN154I0474K is mainly used in the household appliances, electric water heaters, air conditioning circuitry, automobiles, electric tools, and other fields where the insulation needs are high. It also can be used as a filter for signal processing, electromagnetic interference suppression, and high-frequency signal decoupling.

Working principle

The film capacitor works similarly to a traditional paper capacitor. When a voltage is applied across the capacitor, a dielectric layer of film material is formed. The electric field produced by this dielectric material causes electrons to accumulate on the inner and outer metal plates of the capacitor, creating a static charge that is stored in the capacitor. The amount of charge stored in the capacitor is proportional to the capacitance rating of the capacitor.

The BN154I0474K film capacitor is a high-quality part which should meet the needs of most electronic systems. It can operate in challenging environments that traditional paper capacitors could not handle. This makes it an ideal choice for many high-reliability applications.

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