SPA391M02R

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Aluminum - Polymer Capacitors are a type of capacitor that are used in many electrical and electronic applications. The SPA391M02R is a low-profile, surface mount device which can provide high capacitance with low ESR values. It is a polarized capacitor, meaning it has two dissimilar electrodes, and it is also referred to as an electrolytic capacitor.

The SPA391M02R is mainly used as a high-frequency filtering capacitor in radio frequency and high-frequency circuits. It is also ideal for use in automotive applications, as well as in power supplies, DC-DC converters, and voltage converters.

The SPA391M02R operates on the principle of Faraday’s Law of Capacitance, which states that the amount of charge stored in a capacitor is proportional to the potential difference between the plates. This is because when a voltage is applied between the two plates, a field is created between them which causes electrons to be transferred from one plate to the other.

The SPA391M02R has two dissimilar electrodes and an electrolyte solution between them. The electrodes are an aluminium foil and a membrane made from a specialised polymer, and the electrolyte solution is an ionic conducting medium between them. When a voltage is applied, the ions in the electrolyte solution are attracted to the aluminium foil and move towards it, causing a charge difference between the two plates. This charge difference causes a current to flow through the capacitor which is then used to power the circuit.

The capacitance of the SPA391M02R is changed by changing the spacing between the two electrodes, and this can be done by adjusting the tension of the polymer membrane. This allows for more precise tuning of the capacitance and offers good temperature stability. The low ESR and ESL characteristics of the SPA391M02R make it ideal for high frequency filtering applications.

The SPA391M02R aluminum-polymer capacitors are also very reliable and long-lasting as they are able to withstand high temperatures and high humidity. They are also resistant to thermal shock, and the design allows for a low self-discharge rate, meaning they will retain their charge for longer periods of time.

Overall, the SPA391M02R aluminum-polymer capacitors are ideal for use in many different electrical and electronic applications, and they offer excellent electrical and performance characteristics, making them a cost-effective and reliable choice.

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