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Aluminum Electrolytic Capacitors

Aluminum electrolytic capacitors are a special type of capacitor which utilizes an electrolyte, typically an organic solvent, as the dielectric medium. The basic structure of an aluminum electrolytic capacitor consists of two aluminum foils, which act as the electrodes, separated by an oxide layer, which acts as the dielectric. These capacitors offer high energy storage capability in a small package and are ideal for use in low voltage and high frequency applications.

The SMG200VB221M18X35LL

The SMG200VB221M18X35LL is a type of aluminum electrolytic capacitor that offers a maximum capacitance of 220µF, a maximum operating temperature of 85°C, and a maximum leakage current of 0.35µA. With its relatively low-profile of 18mm x 35mm, it is well suited for applications where space is limited, such as handheld electronic devices.

Application Field

The SMG200VB221M18X35LL has multiple applications fields, including:

• Power Supplies: The SMG200VB221M18X35LL is suitable for use as input and output filtering for power supplies, as it has a high capacitance and excellent ripple speaker characteristics. This makes it ideal for designs where wide input voltage range and high power requirement is needed.
• Automotive Electronics: The SMG200VB221M18X35LL can also be used in automotive electronic control units for filtering noisy power lines, as its low leakage current and low electrical noise make it perfectly suited for this application.
• Portable Devices: Due to its small size, the SMG200VB221M18X35LL can be used in portable devices such as smartphones, music players, and other small devices as filtering against EMI noise or as a decoupling capacitor.

Working Principle

The working principle of an aluminum electrolytic capacitor is based on the fact that aluminum foils, being very thin, have a high surface area over which a large voltage can be applied. When voltage is applied across the two electrodes, the trapped ions of the electrolyte start to move towards the positive electrode, which then attracts electrons from the negative electrode. This causes an electrical current to flow through the electrolyte, and the capacitor starts to store electrical energy.

The capacitance of the capacitor is directly proportional to the thickness of the oxide film, which forms the dielectric separating the two electrodes. The thicker the oxide film is, the higher the capacitance of the aluminum electrolytic capacitor will be. Due to this, the SMG200VB221M18X35LL, which uses a thin oxide film, exhibits a relatively low capacitance value.

Conclusion

The aluminum electrolytic capacitor is a type of capacitor which utilizes an electrolyte as the dielectric, and is good for high-frequency and low-voltage applications. One such example of an aluminum electrolytic capacitor is the SMG200VB221M18X35LL, which has low leakage current and is suitable for use in a variety of applications, such power supplies, automotive electronics and portable electronics. Its working principle is based on the electrolyte creating an electric current to store energy, and its capacitance is dependent on the thickness of the oxide film.

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