170333J400DB

Film Capacitors

Film capacitors, also known as plastic film capacitors, polyester capacitors, polycarbonate capacitors, or mylar capacitors, are a type of capacitor which uses a plastic film as its dielectric. Plastic film capacitors were developed in the 1940s, when a dielectric other than air was needed, and they quickly became the standard in the capacitor industry due to their smaller size, greater accuracy, and longer lifespan compared to other traditional capacitors. Film capacitors are now used in a variety of applications ranging from consumer electronics to industrial automation.

170333J400DB Application Field and Working Principle

The 170333J400DB film capacitor is a high-voltage AC capacitor designed for applications in signal conditioning, power conditioning, motor control, and automotive electronics. This capacitors features a blocking voltage of up to 400VAC, a maximim capacitance of 33 μF, and a capacitance tolerance of ±20%. It is also rated for use in temperatures from -55°C to +125°C. It is designed for use in AC-dc converters, UPS systems, power supplies, medium-high voltage AC systems, and motor control circuits.

The 170333J400DB is a dual-layer film capacitor, meaning that it has two separate dielectric layers that are both wrapped around the same metal layer. This construction is similar to a typical multilayer ceramic capacitor in that it offers a compact size and efficient use of space. However, the design of the dual-layer film capacitor offers superior insulation and higher capacitance compared to the multilayer ceramic capacitor.

The capacitor works on the basis of the dielectric constant of the two materials used. The dielectric constant is the ratio of the capacitance of the material to that of a vacuum. When the capacitor is charged, the voltage applied to the capacitor creates an electric field across the film. The electric field creates a force on the electrons in the film, and they move to counteract the effect of the electric field created. As the electrons move, they cause a displacement of the material within the capacitor, creating a separation of charge. This separation of charge creates an electrical field within the capacitor which provides the necessary capacitance.

The 170333J400DB film capacitor is a reliable, high-performance piece of equipment that is designed for use in a variety of electrical applications and can hold up to harsh environmental conditions. It combines the efficiency of space-saving capacitance with excellent insulation and reliable performance.