21FD3703-F

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Film Capacitors

A film capacitor, often known as a plastic or polyester film capacitor, is a component used in electronic circuits for its reliable capacitance and electrical insulation. The term “film capacitor” is applied to several different types of capacitors which share the common property of dielectric insulation in the form of a plastic film.

21FD3703-F: The 21FD3703-F film capacitor is a multi-layer type of capacitor that is designed to offer low ESR and very high ripple current capability to maximize power efficiency. It is a self-healing capacitor, meaning that the impedance decreases as the temperature increases, making it suitable for use in harsh environment. Moreover, this component offers excellent surge resistance due to its robust internal construction.

Application Field and Working Principle

The 21FD3703-F film capacitor is widely used in various applications due to its reliable performance, including electric filters, DC-DC converters, EMI filters, AC-DC power supplies, high-speed switching power supplies, power supplies, and electric vehicles. This component can also be used to improve the transmission speed and reduce transmission losses in automotive applications.

In terms of working principle, the 21FD3703-F film capacitor is primarily composed of two sheets of film dielectric material. The capacitor electrodes are made of high-purity aluminum foil and the dielectric film is wound around the aluminum foils in a spiral fashion. This technique allows the capacitor to maintain a high capacitance value even after operation at high frequencies.

The surface of the aluminum foils of the 21FD3703-F capacitor is coated with a thin film of conductive copper material. This copper film helps reduce the effects of current leakage while the capacitor is operated at higher temperatures. Due to the strong insulation between the two film electrodes, the capacitor is able to achieve excellent high frequency performance.

The 21FD3703-F film capacitor is known for its low losses, high capacitance, and reliable performance in harsh environments, making it suitable for a wide variety of applications. It also offers excellent surge resistance and is highly resistant to corrosive and oxidizing agents, making it an ideal choice for automotive and marine applications.

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