EGXL250ELL221MJC5S

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Aluminum Electrolytic Capacitors: EGXL250ELL221MJC5S Application Field and Working Principle

Aluminum electrolytic capacitors, typically referred to as electrolytic capacitors or just “electrolytics”, are a subtype of capacitors that uses an electrolyte to achieve a larger capacitance per unit volume than other types of capacitors. Aluminum electrolytic capacitors are capacitors that use the physical properties of a thin aluminum oxide layer formed on the aluminum anode foil, combined with an electrolyte, to create the dielectric of a capacitor.

This has the distinguishing features of having a larger capacitance than other types of capacitors, in a much smaller chip size that is just a few millimeters in diameter. As such, aluminum electrolytic capacitors are often used for shopping specific applications, such as a timing capacitors, current-smoothing capacitors, and DC filters for power supplies.

The specific type of aluminum electrolytic capacitor used here is the EGXL250ELL221MJC5S. This capacitor is physically round, with 6mm of sealed casing, and measures 5mm in diameter. It has a voltage rating of 25V, a capacitance of 22μF and a tolerance of 20%, and comes in an SMD package. Here, we will discuss the application field and working principles behind these capacitors.

Application Field

The EGXL250ELL221MJC5S aluminum electrolytic capacitor is best for use as a timing capacitor, as its 20% tolerance allows for a wider range of capacitance values and therefore wider range of uses. In particular, it is well-suited for use in low-power, long-term timing applications. These capacitors often used in oscillator circuits and timing circuitry to provide an accurate, repeatable electrical pulse to the circuit. They are also used in radio frequency communications, such as radio and TV broadcasts.

In addition, the EGXL250ELL221MJC5S also finds use in pulse transformers, capacitive voltage dividers, and voltage regulation circuits. Other related applications include use in power supplies, switching circuits, and voltage regulators.

Working Principle

Aluminum electrolytic capacitors work on a simple principle: An anode cylinder of aluminum foil is immersed in a treatment solution of aluminum oxides and immersed in an electrolyte fluid, where a dielectric layer of uniformly packed aluminum oxide is formed on the surface of the foil. This layer provides the capacitance for the capacitor. The thickness of the layer is determined by the capacitance value, meaning the capacitance is directly proportional to the surface area of the anode.

The electrolyte salt also serves as a bridge between the anode and the cathode. It is through this bridge that current flows when a voltage is applied across the capacitor. The electrolyte allows current to flow to the anode, where it is stored as an electric field across the dielectric.

The EGXL250ELL221MJC5S aluminum electrolytic capacitor also has a shorter life span than other electrolytic capacitors due to its relatively low voltage rating. As such, they should only be used in applications that require a short-term or low-risk timing applications.

Conclusion

The EGXL250ELL221MJC5S aluminum electrolytic capacitor is a unique type of capacitor that is well-suited for use in timing, oscillator, and power supply applications. It has a smaller physical size than standard electrolytic capacitors, and a 20% tolerance rating, meaning it can be used in a wide range of applications. However, its short life span means it should only be used for short-time, low-risk applications.

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