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tantal capacitor

Tantalum capacitors are polarized capacitors with capacitances

between 100 nF and several thousand microfarads (µF). Tantalum capacitors consist of a metallic anode body embedded in plastic. The dielectric is made of tantalum pentoxide (Ta2O5), which is oxidized in a thin layer on the porous anode and is characterized by a high dielectric strength. This is over 600 V/µm. The dielectric has a permittivity

between 20 and 30 and can be applied in minimal thicknesses of only 10 nm. Due to its open-pored surface structure, the anode forms a large area on which an oxide layer only a few hundred nanometers thick is deposited. Therefore, relatively large capacitances can be realized with tantalum capacitors.

Tantalum capacitor in drop shape, photo: Schuricht

Tantalum capacitor in drop shape, photo: Schuricht

Due to their manufacturing process, tantalum capacitors can only be operated in a given polarity. The polarity can be recognized by the lengths of the connecting wires; the anode with positive polarity is the longer, the cathode the shorter connecting wire. Tantalum capacitors can be in wound form or in drop form.

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Englisch: tantal capacitor
Updated at: 06.03.2014
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