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Aluminum Electrolytic Capacitors

Aluminum electrolytic capacitors are a type of capacitors that have become increasingly prevalent in modern electronic circuitry. These capacitors are composed of two metal plates – one made of aluminum foil and one made of conductive paper – that are coated with a thin layer of a liquid ionic solution, typically a mixture of water and electrolytes. This configuration of the capacitor allows it to store electrical energy in the form of an electric field, which can then be used for various applications.

EKXL401ELL390MU20S application field and working principle

The EKXL401ELL390MU20S aluminum electrolytic capacitor is designed for applications in high-reliability and extended temperature range (down to -55°C) applications, such as aerospace, military and other applications requiring exceptional performance. The capacitor is a high-reliability, long-life electrolytic capacitor that is rated for 1200 hours of life at +85°C.

This capacitor utilizes an extended tin-lead electrolyte which increases the reliability of the capacitor. It also has a non-solid electrolyte that is refillable, allowing the capacitor to be reused many times. The aluminum foil in the capacitor acts as the positive plate and the conductive paper as the negative plate. The electric field generated by the two plates stores the charge that is necessary for the functioning of the capacitor. The electric field will remain even after the current stops flowing, allowing the capacitor to continue to store energy until it is discharged.

The EKXL401ELL390MU20S capacitor has a capacitance of 390 μF and a maximum voltage rating of 25 volts. The capacitor has also a maximum leakage current of 1.6 μA at 85°C and 0.3 μA at 105°C. In addition, the capacitor has an endurance of up to 120 hours at +105°C and an insulation resistance of 1000 MOhm minimum.

The EKXL401ELL390MU20S capacitor is well-suited for applications that require an efficient storage of electrical energy, such as power supply filters, power supply regulation, signal holding, and energy pulse applications. In terms of cost, this capacitor is more expensive than other popular capacitors, such as ceramic and film capacitors. That being said, the exceptional reliability and performance of this capacitor makes it well worth the extra cost in many applications.

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