B25856K3255K3

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Film capacitors are components used in multiple applications, like power conditioning and power factor correction, low-voltage DC/AC and other electric fields. They are primarily used to store energy or for signal integration or filtering and noise suppression. B25856K3255K3 is one of the film capacitor models available. This article discusses its application field and working principle.

In traditional designs, film capacitors are used in AC circuit, where the ripple filter capacitors need to attenuate the ripple current. With their small size and low cost, they are also widely used in signal coupling, filter circuits, and various sensors. Specifically, the B25856K3255K3 is a PP film (polypropylene) capacitor that is mostly employed for coupling operation as well as for high attenuation of ripple currents in AC circuits. It is also used in various switching mode power supply designs requiring impedance in a few nano-Farads range.

The B25856K3255K3 capacitors are rated for working temperatures from -40°C up to +85°C and the dimensions of these components are 10 × 10 mm and 8 × 8 mm, respectively. When using this model, it is suggested to first mount the capacitor on the PCB board with the nominated current and voltage levels printed in the datasheet and then apply the soldering. After that, the soldered parts should be tested to meet the certification standard.

The construction of B25856K3255K3 capacitors is composed of an aluminum layer, which is sandwiched between two PP film layers and terminated with tin plated axial leads, rosin flux soldering. The working principle is based on the same physical laws as we found in other types of capacitors, as the current flows between the two metal plates separated by a dielectric material (PP film). As the electrons move to one side of the metal plate, they move to the other side, causing a decrease in the charge level (the capacitance). This capacitance is affected by the surface area of the metal plates, the thickness of the PP film in between, as well as the dielectric constant of the PP film. This capacitance is shown by the capacity per distance, according to which the B25856K3255K3 capacitors are classified.

In summary, the B25856K3255K3 capacitors are thin-film capacitors with a wide range of applications, and they are rated for temperatures from -40°C up to +85°C. They are constructed of an aluminum layer with two PP film layers, and they are mainly used for attenuating ripple current in AC circuits. The working principle is based on the same physical laws we found in other types of capacitors, where the current flows between two metal plates separated by a dielectric material.

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