200YXF220MKC18X35.5

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Aluminum electrolytic capacitors, also called “electrolytic caps”, are electrical components made of two or more layers of metal foil separated by a flat metal oxide layer and impregnated with electrolyte. This type of capacitor is commonly used in electrical and electronics applications due to its high capacitance, low equivalent series resistance (ESR) and long life expectancy. The specific part number 200YXF220MKC18X35.5 is an aluminum electrolytic capacitor and belongs to the group of Type YXF capacitors.

The first two digits of a type YXF capacitor, 200, denote the rated voltage, which is typically 200 Volts. The three following digits, YXF, denote the series label. This type of capacitor is designed to provide a higher capacitance per unit volume and has an impressively low ESR. The body of the capacitor also carries the low-ESR designation. The remaining four digits, 220MKC, denote the capacitance and tolerance codes. In this case, the capacitance value is 220 microfarads and the tolerance code is +20/-20%, which is indicated by the letters MKC. Lastly, the last two digits, 18 and 35.5, denote the physical size of the capacitor according to the Leads-in-a-Row (LIR) form factor and the diameter of the can, respectively. Therefore, this particular aluminum electrolytic capacitor has an 18 mm body with a 35.5 mm lead spacing.

Aluminum electrolytic capacitors are characterized by a polarization voltage. This voltage is the required DC voltage that must be applied across the terminals of the capacitor to generate an electric field. The polarization voltage should be high enough such that all electrical charges are moved inside the dielectric layer. Once this voltage is reached, a capacitive current, also known as the “leakage current”, flows through the capacitor. This current is proportional to the capacitance and the temperature.

In electrical and electronics applications, aluminum electrolytic capacitors can be used either for the purpose of energy storage or filtering. Capacitors can be connected in parallel or in series to increase or decrease the total capacitance of a circuit. When connected in parallel, the capacitance of the circuit is greater than that of an individual capacitor, thus, a higher capacitance can be achieved. On the other hand, when connected in series, the capacitance is reduced as all of the capacitors must pass current.

Aluminum electrolytic capacitors are used extensively in electronic circuits due to their reliable performance, long lifespans and low ESR. The polarization voltage is responsible for the performance characteristics of these capacitors, and must be selected carefully in order to prevent device damage. Although the static characteristics of these capacitors are predictable, their dynamic performance should also be tested in order to ensure the highest levels of reliability.

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