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Film Capacitors

Film capacitors, also known as polyester capacitors, are passive components which store and release electrical energy. They are more commonly used in a variety of electronic circuits, including the audio frequency range from 10 kHz to 500 kHz. Film capacitors can be made from polyester, polystyrene, polyphenylene sulfide, polycarbonate, polypropylene, polyethylene-terephthalate (PET), polytetrafluoroethylene (PTFE) or polyethylene, and depending upon their application, some of these materials might be used in combination.

B32682A7472K000 Application Field and Working Principle

The B32682A7472K000 film capacitor is specifically designed for automotive applications, where excellent long-term reliability and stability are required. The capacitor has an operating temperature range of -40 °C to 125 °C, an operating voltage up to 160 VDC and a capacitance of 0.47µF.

Film capacitors work on the same principle as other types of capacitors. By applying a voltage to the capacitor, a current flows through it and charges up the plates. The amount of charge stored on the plates depends on the size of the plates and the material between them, and is measured by the capacitance, which is expressed in Farads (F).

Due to their construction, film capacitors are able to store much higher capacitance per unit package size, making them ideal for high frequency and power applications. They typically feature very low inductance, excellent frequency and temperature stability, zero-failure even in extreme environmental conditions, and long life expectancy. They are often used in automotive applications including airbag system, transmission control, active suspension, fuel injection, and engine control.

Unlike ceramic capacitors, film capacitors are polarized, meaning they must be connected to their circuit the right way round. Because of the thin film material between the plates, film capacitors are also more prone to dendritic growth and must be strictly monitored for proper working.

In summary, B32682A7472K000film capacitors are ideal for automotive applications where reliability and performance are essential. It features excellent operating temperature range, operating voltage, and capacitance. It is characterized by a very low inductance, excellent frequency and temperature stability, and a long life expectancy. Moreover, it features zero failure even in extreme environmental conditions.

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