T491C226K020AT2478

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T491C226K020AT2478 is a type of tantalum capacitor, which is an electrolytic capacitor.It consists of a tantalum metal powder core or rod, with the anode from the metal, covered by an insulating oxide film. An electrolyte contacts the oxide film. The cathode is usually a surfactant-coated manganese dioxide powder. It has much higher capacitance, as well as a much lower ESR rating, than any other electrolytic capacitor.

In any electronic application, the generous use of this type of tantalum capacitor is quite common due to the above advantages. The main advantages of the tantalum capacitor compared to other types of capacitors are its low leakage current, excellent electrical characteristics and high capacitance. Because of its small size, it is also very attractive in applications where space-saving is required.

To gain a better understanding of the working principle of a T491C226K020AT2478, it is necessary to understand the way it is constructed. Tantalum capacitors are polarized and are typically constructed of three distinct pieces: a tantalum anode, a separator, and a manganese dioxide cathode. The anode is usually made from pressed powdered tantalum and is covered with an oxide layer that acts as an insulator. However, the oxide layer is not the entirety of the anode; part of it is also in contact with an electrolyte, which is usually a mixture of sulfuric acid borate and phosphoric acid.

The separator is made of porous layers that are usually plastic impregnated with the same electrolyte used for the anode. This separator is placed between the anode and cathode and serves to reduce or even prevent the possibility of contact between the two.

The manganese dioxide cathode consists of a mixture of manganese dioxide and a perfluoropolyether surfactant, which essentially improves the contact between the manganese dioxide and the electrolyte. This combination of electrolyte and cathode material is what helps a tantalum capacitor stay electrically charged.

When a voltage is applied to one of the connectors of the capacitor, electrons begin to flow from the anode to the cathode. As these electrons flow, they make contact with the thin oxide layer, which then works like a battery to charge the capacitor. The more electrons that are able to make contact with the oxide layer, the greater the capacitance of the capacitor.

Some important characteristics to consider when selecting a tantalum capacitor are capacitance, voltage rating, leakage current, and temperature coefficient. It is important to choose a capacitor that is capable of handling the voltage and current levels of your application and also ensure that the temperature coefficient of the capacitor is appropriate for the operating temperature of your application.

In conclusion, the T491C226K020AT2478 is an excellent choice of capacitor for many applications due to its superior characteristics. It has a low leakage current, an excellent electrical characteristics, and high capacitance. It is also small in size, which means it is also attractive when space-saving is required.

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