E37L401CPN153MFK0M

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Aluminum Electrolytic Capacitors

Aluminum electrolytic capacitors, also known as aluminium electrolytic capacitors, are capacitors that use an electrolyte and an aluminum foil as the dielectric material. The aluminum, which acts as the anode, is chemically etched to form a large number of small surface area capacitors in parallel. Since aluminum electrolytic capacitors are polarized capacitors, this means they have a positive and a negative terminal. The liquid within the capacitor is a type of salt solution which provides a very good electrical insulation.

E37L401CPN153MFK0M

The E37L401CPN153MFK0M is a surface-mounted aluminum electrolytic capacitor with an extended operating life of 10,000 hours. It has a rated voltage of 25V and a capacitance of 47µF, making it suitable for applications such as decoupling, motoring, and filtering. Its small size and low leakage current make it ideal for automated assembly, saving time and reducing costs. In addition, being able to operate under wide temperature ranges and withstand crush and shock tests makes it well-suited for applications operating in harsh environments.

Application Field and Working Principle

As mentioned earlier, aluminum electrolytic capacitors are widely used due to their high capacitance per volume ratio. The most common application of these capacitors is in power supplies, where they provide a buffer to smooth out the voltage fluctuations of the input power. They are also used for decoupling, where they provide local energy storage to provide a buffer between the power supply and the load. They are also used in motor control and filtering applications, where they provide stable voltage levels and block high-frequency noise.

The working principle of aluminum electrolytic capacitors relies on the electric field created in the electrolytic dielectric. This electric field is created between two thin layers of aluminum with a liquid electrolyte between them. As the voltage across the two layers changes, charges are injected and withdrawn from the electrolyte to create the electric field. This electric field causes a voltage drop across the electrolyte which in turn provides the capacitance.

In some aluminum electrolytic capacitors, the dielectric is reinforced by a third electrode which is made of a conductive metal such as silver. This third electrode helps stabilize the dielectric and also helps increase the capacitance. Additionally, some aluminum electrolytic capacitors are designed with a self-healing property, where the leaking electrolyte reforms back to the liquid state after the voltage is removed.

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