Tantalum capacitor
A capacitor stores a charge and then supplies the charge required for the operation of a device, such as a semiconductor device. As the integration of the semiconductor devices increases, the size of the cells becomes smaller, and the capacitance required for the operation of the devices increases. A tantalum capacitor, a typical capacitor which has small size, low ESR, and high capacitance, has rapidly become popular as a component in cellular phones and personal computers. Tantalum capacitors are valued because of their ability to supply a high capacitance value within a limited volumetric space. Tantalum is currently used extensively in the electronics industry which employs tantalum in the manufacture of highly effective electronic capacitors. This is mainly attributed to the strong and stable dielectric properties of the oxide film on the anodized metal. The capacitance of a tantalum capacitor is effectively increased by increasing the surface area of fine metallic powder which is employed. Typical wet tantalum capacitors have porous anodes which are housed in a tantalum case and hermetically sealed. Such capacitors are well suited for use in military and industrial circuits that demand quality and reliability in filtering, bypass, coupling, storage and timing applications. A tantalum solid-state electrolytic capacitor is constituted of a sintered body obtained through sintering of tantalum powder, a tantalum oxide layer formed on the surface of the sintered body, a solid-state electrolyte on the tantalum oxide layer, and a conductive layer. The capacitor is polarized, in which a metal tantalum generally becomes an anode side electrode and the conductive layer on the solid-state electrolyte becomes a cathode side electrode. Anodes or electrodes for electrolytic tantalum capacitors are manufactured by compacting or compressing a precise quantity of capacitor-grade tantalum powder.
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