BFC2373EL154MD

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Film capacitors are the preferred choice for many design engineers for their electrical applications. They are available in a range of configurations and are a good choice when high capacitance is required in a small package, with low loss and extremely low temperature coefficients. The BFC2373EL154MD is an example of this type of capacitor. It is designed for use in high-frequency electronic applications where very reliable, high power density is required.The BFC2373EL154MD is a high-voltage capacitor, with a rated voltage of 1500Vdc. It is a metallised polypropylene-film capacitor with a tolerance of 5%. Its capabilities make it an ideal choice for dc-link applications in high-frequency inverters or resonant DC power supplies. The capacitor has a wide temperature range of -40°C to +105°C for rated voltage and is available with lead times of approximately 3 weeks.The composition of the capacitor is an integral part of how it works. The BFC2373EL154MD is a self-healing, non-polarized capacitor which is determined by the use of polypropylene film and electrode foil. The polypropylene film is an insulator which acts as a dielectric between two conductors, forming the basis of the capacitor. The electrochemical capacitance of polypropylene film is relatively low and therefore to increase its value, the dielectric must be thinned. The thinning is achieved by metallising the film. The film is then wound into a roll, providing a blanket layer of metalised insulation that remains intact during charge/discharge cycles.The metallised film electrodes also provide a certain degree of shielding from external electric fields. This shielding allows for noise rejection in areas prone to high EMI (electromagnetic interference). This is because the capacitor has a low internal loss allowing for optimised filtering, and it also maintains tight DC voltage tolerances.When an AC voltage is applied to the capacitor, the electric field causes the film capacitors to acquire a net charge. This charge will remain stored in the film as long as the voltage remains applied. When the voltage is removed, the capacitor will discharge at a rate determined by its equivalent series resistance (ESR). The ESR is a resistance present in the capacitor that is inversely proportional to capacitance. Low ESR will result in fast discharge time, whereas high ESR will result in slower discharge time.In terms of construction, film capacitors are very robust and reliable. This is due to the fact that their components are all held together via pressure moulded extremely thin films, which are then encapsulated in a plastic casing and sealed along the seams with epoxy resin. As the plastic housing only conducts heat in one direction, film capacitors operate at low temperatures, opposite to their more heat intensive counterparts such as electrolytic.In conclusion, the BFC2373EL154MD is a reliable and robust capacitor used for high-frequency electronic applications where very reliable, high power density is required. It is available with a voltage rating of 1500Vdc and a tolerance of 5%. The capacitor is a self-healing, non-polarized capacitor which is composed of polypropylene film and electrode foil. It has a low internal loss allowing for optimized filtering, and it also maintains tight DC voltage tolerances. The low ESR value of the capacitor ensures fast discharge time, and the robust construction and low operating temperature allows it to operate reliably in conditions that many other capacitors could not.

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