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Tantalum capacitors have been on the market for three-quarters of the century. The major advantage of tantalum capacitors in comparison to other major types of capacitors, such as multilayer ceramic capacitors, film capacitors, and aluminum electrolytic capacitors, is their record high volumetric charge and energy efficiency. The high efficiency is provided by the large surface area per unit of volume of tantalum anodes sintered with fine tantalum powder and small submicron thickness of the anodic oxide film of tantalum employed as a dielectric in tantalum capacitors. The other advantage of tantalum capacitors in comparison to other types of the capacitors is capacitance stability with voltage and temperature. There is practically no change in capacitance measured with and without DC bias and small variation in capacitance within normal range of operating temperatures. Besides that, there is no aging of tantalum capacitors; their capacitance remains stable during any practical duration of the testing and field application.
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- Chapter 4