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Film Capacitors

Film capacitors are a type of capacitor that makes use of a thin plastic or polymer film as the dielectric medium. The film is usually placed between two metal or conductive surfaces, typically called the anode and the cathode. By incorporating a film into the construction of a capacitor, it can provide improved performance over traditional capacitors, including significantly improved dielectric properties and stability. It also allows for a much smaller form factor.

B32911A4152M189

The B32911A4152M189 is a film capacitor made by EPCOS, one of the leading manufacturers of film capacitors. It is a radial leaded, metallized polypropylene film capacitor with superior insulation characteristics. It has a rated voltage of 250V, a capacitance value of 4.7nF and a tolerance of ± 10%. It is characterized by a long life up to 2,000 hours, low ESR and excellent repeatability.

Application Field

The B32911A4152M189 is mainly used in automotive electronics, lighting systems, power supplies, control circuits and low-voltage power systems. In automotive electronics, it is generally used as an energy storage device for noise filtering and smoothing, as well as for preventing voltage spikes that may cause damage to the wiring and other components of the system. In lighting systems, it is used for improving lamp performance by smoothing the DC voltage and for reducing the e.m.i. generation by suppressing high frequency noise.

Working Principle

Film capacitors work on the principle of charge polarization. When a voltage is applied across the dielectric material, the material\'s molecules become polarized and acquire a fixed charge. This charge creates an opposing electric field, thus reducing the voltage across the capacitor. This charge also provides the electrical field of the circuit, which is used for any desired electrical effect.

At the same time, as the voltage is applied, the electrons in the conductor form a circular continuous motion, creating a continuous current in the external circuit. This current is then stored in the capacitors, as the charge remains there even after the voltage source is disconnected.

Due to the energy stored in the capacitor, the voltage across it does not drop immediately to zero, and thus the current continues for a while after the power supply is disconnected. This is the reason why film capacitors are often referred to as "energy storage" devices.

The B32911A4152M189 is a reliable and efficient film capacitor, which can be used for a variety of applications ranging from automotive electronics to power supplies and lighting systems. Thanks to its reliable construction and excellent insulation characteristics, it is suitable for many applications.

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