SFD66S35K491B

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Film Capacitors

Film capacitors offer a high electro-mechanical performance with long lifetimes and reliability. They are used in a wide range of applications from precise timing components to portable consumer products. Their use is growing in fields where precision, high reliability, smaller physical size and long lifetimes are required. Generally, these types of capacitors require no metal plates and are more lightweight, have better stability in extreme temperatures, and higher insulation resistance than electrolytic and ceramic capacitors.

SFD66S35K491B Application Field and Working Principle

The SFD66S35K491B is a polyester film capacitor designed for DC-link, DC-link filtering, and rectification applications. It offers an excellent combination of reactive, capacitive and electrical properties necessary for operation in high-frequency power control circuits. The device provides an increased level of reliability compared to traditional film capacitor technology by utilizing a high-temperature sintered-ceramic monolithic material construction for better insulation and over-voltage protection.

The SFD66S35K491B is based on a construction that consists of two metal back plates, electro-coated on both sides, between which a polyester film is wound in a series configuration. The back plates act as two inter-leaved capacitors, with one plate serving as a ground (or reference) and the other acting as a voltage-holding plate. The capacitance of the device is determined by the applied voltage, the size of the back plate area, the thickness of the film, and the distance between the two plates. When exposed to a voltage, the area of the film between the back plates is charged, creating a capacitive effect.

The electric field generated by the applied voltage causes the film to experience a variety of physical effects, including tension and bending, which can sometimes result in buckling or wrinkle formation. In order to prevent deformation of the film and maximize reliability, the SFD66S35K491B includes a high-temperature sintered-ceramic monolithic material over the plates. This material increases the insulation resistance, prevents over-voltage, and ensures a uniform electrical distribution throughout the device.

The SFD66S35K491B has several advantages over traditional film capacitors, including better insulation, higher surge-catastrophe voltage, reduced size and weight, and increased life span. Due to its increased reliability, the device is well-suited for use in high-frequency power control circuits, DC-link, DC-link filtering, and rectification applications, where many traditional film capacitors would fail.

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