E37F421CPN392MDD0M

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Aluminum electrolytic capacitors are one of the basic passive components of electronic equipment. Found in a variety of applications such as motor control, power supplies, sensing and communication, they perform the important function of storing electrical energy. The E37F421CPN392MDD0M aluminum electrolytic capacitor is a commonly used part, and its application field and working principle is as follows:

Application field

The E37F421CPN392MDD0M aluminum electrolytic capacitor is primarily used in power electronic equipment, such as: frequency converters, meters, instrumentation, adjustable power supply, UPS, frequency control, electric drive, motor control, medical equipment, etc. In addition, the E37F421CPN392MDD0M aluminum electrolytic capacitor is also used in many communication products, including modems, optical access systems, radios, switches and so on. This aluminum electrolytic capacitor is suitable for various DC circuits, especially for power systems or high ripple current circuits.

Working Principle

The E37F421CPN392MDD0M aluminum electrolytic capacitor is a kind of capacitor that uses aluminum foil as the anode and a dielectric oxide film formed on the surface of the aluminum as the dielectric to generate capacitance. The anode of aluminum electrolytic capacitor is usually rolled into a cylinder in the form of a drum or rolled with another layer of electrolytic paper. The internal structure of an aluminum electrolytic capacitor is much more complicated than a ceramic capacitor, because it consists of two electrodes, two electrolytes, and an electrolyte insulating paper. Its working principle is as follows: when a DC voltage is applied between the two electrodes, the positive electrode (anode) produces oxygen, which reacts with the aluminum to form a thin oxide film on the surface of the positive electrode, and this oxide film acts as the insulating layer of the capacitor.

When the electric field on the surface of the oxide film exceeds its strength, electrons are injected into the oxide layer in the form of a reverse current. At this time, electrons are injected from the negative electrode (cathode) to the positive electrode (anode). The electrons will penetrate the alumina layer and accumulate on the aluminum surface to form a negative charge on the surface of the alumina, which is called the Helmholtz layer. This layer is like a negative charge location on the surface of the film, and increases the capacitance of the capacitor, so it is also called the capacitance layer. The space between the electron accumulation layer and the inner surface of the oxide film can ensure that the electrons are highly mobile, so that electrons can be quickly and continuously injected into the oxide layer, forming a space charge layer, thus continuously maintaining the capacitance.

In addition, the E37F421CPN392MDD0M aluminum electrolytic capacitor has very low leakage and high stability characteristics, and can be used in wide temperature range. But its life span is limited, usually about 2000-3000 hours according to its application environment and its surface temperature. If it is applied in high temperature, its life span will be greatly shortened, and it needs to be replaced in time.

The E37F421CPN392MDD0M aluminum electrolytic capacitor is a small-sized, highly reliable and durable device, which is widely used in various DC circuits. Its application field and working principle have been described above.

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