B32656S0125K564

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Film Capacitors

Film capacitors are electronic components with two conductive plates sandwiched between a thin dielectric film. The dielectric material holds the electric charge and affects the capacitance value. This construction style provides excellent temperature stability and higher frequency operation. The most common types of film capacitors are polyester, polycarbonate and polypropylene.

The B32656S0125K564 is a polyester film capacitor from the S Series by EPCOS. The capacitor has a rated voltage of 25 VDC, a capacitance of 0.0012 μF and a tolerance of ±10%. The capacitance value can be read from the code printed on its body – B 32656 S0125K564. The B stands for Bauform, which is a standardized form of electrical components. The 32656 indicates the type of material used – in this case, polyester film.

Application Fields

Film capacitors are often used as coupling and decoupling capacitors. Coupling capacitors transfer alternating current while blocking direct current while decoupling capacitors suppress high frequency interference. Film capacitors are also often used in DC-DC converters, power supplies, filters, regulators, and turbocharger circuits. These capacitors are easy to integrate into the circuits and have excellent energy storage capabilities and operating temperature.

Working Principle

The concept behind a film capacitor is similar to other capacitors. It stores electrical energy in an electric field created between two conductive plates. The distance between the two plates and the type of dielectric material determine the capacitance of the capacitor. The dielectric material also affects the voltage rating of the capacitor.

The construction of the B32656S0125K564 consists of two metalized plastic films separated by a thin dielectric film. The metalized plastic films act as the two electrodes while the dielectric material acts as the insulator. The strength of the construction depends on the choice of the electrically stable dielectric. The classification according to IEC 60384-14 specifies the choice of materials and construction technique.

The way a film capacitor works is simple. When a voltage is applied to the capacitor, electrons accumulate in the dielectric material, creating an electric field between the two electrodes. The voltage across the capacitor remains constant until it’s fully charged or the current is changed. When the current is changed, the capacitance value changes, signaling the capacitor to store more or less electrical energy.

Once the voltage across the capacitor reaches the rated value, the capacitor is said to be fully charged. At this point, any further increase in the voltage will cause the dielectric material to break down and the capacitor will fail. This is why it’s important to choose the right film capacitor for the application. The voltage rating should be at least 1.2 times the working voltage of the circuit.

Conclusion

Film capacitors have many benefits over other types of capacitors such as small size, high reliability, long life, low ESL, and low ESR, making them a great option for a variety of applications. The B32656S0125K564 is a polyester film capacitor from the S Series by EPCOS. It has a rated voltage of 25 VDC, a capacitance of 0.0012 μF, and a tolerance of ±10%. With its excellent temperature stability and operating temperature, it is ideal for use in DC-DC converters, power supplies, filters, regulators, and turbocharger circuits.

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