200SXW100MEFC18X20

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Aluminum Electrolytic Capacitors are mainly comprised of an internal aluminum foil that acts as the anode, a dielectric oxide film which is a few nanometers thick, a chemical solution electrolyte which is usually liquid, and an external aluminum foil which serves as the cathode. The capacitor is produced by rolling up these internal and external foil electrodes, and providing the connection to external terminals.

The 200SXW100MEFC18X20 is an aluminum electrolytic capacitor. The 200 in the number refers to the rated voltage in volts. SXW means the smaller case size of the 8mmx11mm. 100M refers to the capacitance in micro farads. EFC refers to the fact that the capacitor is a through-hole device and not a surface-mount component. 18x20 is the code used to denote the pin spacing of the two pins in millimeters (18mm between the pins and 20mm between the two rows of pins).

The main application of this aluminum electrolytic capacitor in particular is for filtering. This is a very common application of aluminum electrolytic capacitors in general. As current passes through the capacitor, the charge accumulates on its inner plates, forming a voltage across them and giving rise to capacitance. This form of capacitance is known as “DC blocking” – DC is blocked while AC is allowed through. This allows for the purification of the signal by filtering out many of the unwanted frequencies.

Aside from a filtering applications, this aluminum electrolytic capacitor is also used for buffering and decoupling. This is often used to decouple power rails in high current applications, such as in LED lighting, to ensure that interference between different circuits is kept to a minimum.

This aluminum electrolytic capacitor also has other applications, like bypassing, smoothing, and integrating. Bypasing is a frequency dependent application where the capacitance of the capacitor is used to determine the cutoff frequency of the electrical circuit. Smoothing is a noise-suppressing application where a capacitor is used to absorb and “smooth out” short-duration pulses. Lastly, integrating is used for DC averaging, as the capacitor inherently has some resistance to the flow of DC currents.

In terms of the working principle, this aluminum electrolytic capacitor works in a very similar way to other types of capacitor. It consists of two plates separated by an insulating material, usually a dielectric. When a voltage is applied across the plates, a charge builds up on each plate which creates a potential difference between them. This potential difference is known as the capacitance. The capacitor stores energy in the form of electrostatic charge and releases it when it is needed.

Generally speaking, the higher the capacitance of the capacitor, the more charge it can store and the more energy it can deliver. This makes aluminum electrolytic capacitors ideal for use in electrical circuits, as they are able to deliver a large amount of charge in a short amount of time. This makes them especially useful for applications such as filtering, buffering, and bypassing.

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