T491A684M020AT2478

T491A684M020AT2478 is a type of tantalum capacitor. Tantalum capacitors are surface-mount, solid electrolyte capacitors that offer high volumetric efficiency and low leakage rates over wide operating temperature range. The main difference between tantalum capacitors and other forms of capacitors is the use of tantalum as the anode, which allows for a much higher capacitance than other types of electrolytic capacitors.

T491A684M020AT2478 is generally used in power supplies, switch mode power supplies (SMPS), analog circuits, and digital circuits. Its capacitance of 0.684μF (microfarads) makes it ideal for smoothing the DC voltage for general filtering applications, where a large capacitor is not necessary but a high volumetric efficiency and long life are required. Its ultra stable performance over a wide temperature range makes it an ideal choice in certain switching power supplies as localized filtering components.

T491A684M020AT2478 is a polarized capacitor, meaning that it will only conduct AC current in one direction. It has an operating voltage of 20 Volts and an effective series resistance (ESR) of 0.12 ohms. The electrolyte used may be electrolytic or conductive polymer, while the cathode material may be manganese dioxide or conductive polymer. The capacitance of the device will decrease slightly when its voltage rating is exceeded.

T491A684M020AT2478\'s working principle is based on electrical charge within the device. When AC voltage is applied to the terminals, positive electric charges are collected from one electrode, while negative charges are collected from the other. These charges are stored in the dielectric layer, a ceramic material located between the electrodes. As current flows within the circuit, the stored charge is discharged, giving rise to an electric field which opposes the flow of current. This flow of current is captured by the device and stored in the capacitance, providing a smoothing action to the voltage.

In conclusion, T491A684M020AT2478 is a type of tantalum capacitor which has high volumetric efficiency and low leakage rates over wide operating temperature range. It is mainly used in power supplies, analog circuits, and digital circuits. Its working principle is based on electrical charge storage within the device, where electric charges are stored in the dielectric layer and released when AC voltage is applied to the terminals.