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Aluminum Electrolytic Capacitors

Aluminum electrolytic capacitors are the oldest, cheapest and most widely used form of capacitors. Aluminum electrolytic capacitors are types of capacitors which use an electrolytic solution to create an electrical charge. They contain two conductive plates separated by a dielectric of aluminum oxide. The type of oxide used will vary depending on the application, and the types of capacitor available range from very small, low value capacitors to large, high value capacitors. Aluminum electrolytic capacitors are used in a variety of applications from consumer electronics to automotive, aerospace and many other industrial applications.

PEH200OO427AMB2

The PEH200OO427AMB2 is a tall aluminum electrolytic capacitor with a molded case made of thermoplastic molded composite (PMC). It is rated at a voltage of 200V and a capacitance of 27mF. The PEH200OO427AMB2 is suitable for use with general-purpose DC and pulsed switchmode power supplies.

Application Field and Working Principle

The PEH200OO427AMB2 is primarily used in DC and power supply applications where a large capacitance value, low ESR and leakage current are desired. This type of aluminum electrolytic capacitor can also provide attenuation, filter out high frequency signals, smooth waveforms, and store energy. The PEH200OO427AMB2 is constructed of two conducting plates, an electrolyte and a dielectric layer of aluminum oxide. The electrolyte provides the electrical field necessary to accept and store an electrical charge between the two plates, while the aluminum oxide layer helps to maintain the charge and provide insulation between the plates. As electricity passes through the capacitor, the ions within the electrolyte attract electrons on one of the conducting plates, creating an electrical charge. This charge is stored within the capacitor and can be used for various applications such as filtering, attenuation and energy storage.

The PEH200OO427AMB2 is ideal for applications requiring high capacitance values and low ESR, such as uninterrupted power supplies (UPS) and motor drives. It is also suitable for many other applications such as computer motherboards and biomedical equipment. Its compact housing and low profile ensure that it does not take up too much space in an application, which is especially important in confined spaces. The PEH200OO427AMB2 also operates in a wide temperature range of -55C to +105C and can be used in both commercial and industrial settings.

Benefits of Aluminum Electrolytic Capacitors

Aluminum electrolytic capacitors offer several advantages over other types of capacitors, including lower cost, high capacitance, long lifetime and improved reliability. Aluminum electrolytic capacitors also have a wider temperature range of operation and a higher operating frequency range than other types of capacitors. This makes them ideal for applications requiring a range of temperature and frequency specifications.

Aluminum electrolytic capacitors are highly reliable, making them suitable for applications where other types of capacitors may fail. For example, in power supplies, aluminum electrolytic capacitors can handle high ripple currents created during start-up and shutdown periods, and also provide inrush current protection. In addition, aluminum electrolytic capacitors are also effective in noise filter applications, as they can reduce high frequency components of input signals.

Limitations of Aluminum Electrolytic Capacitors

The main limitation of aluminum electrolytic capacitors is the limited voltage rating. Aluminum electrolytic capacitors usually have a lower voltage rating compared to other types of capacitors, such as ceramic capacitors. Furthermore, aluminum electrolytic capacitors require reverse voltage ratings, meaning that a minimum voltage must be applied to keep the capacitor in regulation.

Aluminum electrolytic capacitors also have a shorter life span compared to other types of capacitors, and therefore require more frequent replacement. Furthermore, the electrolytic solution within the capacitor also tends to dry out over time, reducing the capacitance value. This can be accelerated by exposure to high temperatures, so aluminum electrolytic capacitors should be used in applications where temperature ranges are known to be acceptable.

In addition, aluminum electrolytic capacitors are not suitable for high-frequency applications due to their relatively high internal resistance. This limits their use in switching power supplies, as they do not provide enough current when operating at higher frequencies.

Conclusion

Aluminum electrolytic capacitors are a type of capacitor which utilises an electrolyte solution to store an electrical charge. They offer a number of advantages over other types of capacitors, such as lower cost, higher capacitance values, long lifetime and improved reliability. The PEH200OO427AMB2 is a tall aluminum electrolytic capacitor suitable for use with general-purpose DC and pulsed switchmode power supplies. It is ideal for applications requiring high capacitance values and low ESR, and can handle high ripple currents and provide inrush current protection. However, aluminum electrolytic capacitors also have some limitations, such as a reduced voltage rating, shorter life span and lower frequency range.

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