T491A474K020AT2478

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Tantalum capacitors are a type of electrolytic capacitor that are used in a wide range of applications in electronics and electrical engineering. They provide a combination of high capacitance and low equivalent series resistance, making them suitable for applications where reliability and performance are paramount. The T491A474K020AT2478 is an axial-lead, through-hole version of this type of capacitor.

T491A474K020AT2478 capacitors are most often used in power electronics and audio applications, where they are primarily used to hold voltages and current surges before they reach sensitive components further down the circuit. The capacitance is rated in farads, and the T491A474K020AT2478 capacitor holds around 4.7µF — more than enough for most projects.

Internally, the capacitor is composed of Managets, an oxide layer and a cathode. The oxide layer is a dielectric material that acts as an insulator and is capable of maintaining the capacitance at acceptable limits. The circuit is completed when a voltage is applied across the terminals of the capacitor, allowing electrons to flow from the cathode to the anode. The electrons collect on the oxide layer, which gives it a negative charge. This negative charge attracts the positive charges from the anode, forming a temporary capacitance.

The amount of capacitance is determined by the size of the capacitor, the distance between the electrodes, and the type of dielectric material used in the oxide layer. In the case of the T491A474K020AT2478, the dielectric material is Ta20, a tantalum pentoxide. This material provides an extremely low leakage current, making it ideal for applications where power is at a premium, such as cell phones or computers.

The T491A474K020AT2478 is rated for operation at temperatures up to 125°C, withstanding over-voltage and reverse-polarity conditions without any significant damage. This robustness and reliability makes it an ideal choice for applications where a stable capacitor is needed to maintain consistent performance. The package style of this particular capacitor is also very small, making it suitable for use in tight spaces in a variety of applications.

In summary, the T491A474K020AT2478 is a reliable and compact through-hole tantalum capacitor suitable for use in a variety of power electronics and audio applications. Its 4.7µF capacitance, high temperature rating, and low leakage current make it an ideal choice for projects where performance and reliability are important.

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