A tantalum electrolytic capacitor is an electrolytic capacitor, a passive component of electronic circuits. It consists of a pellet of porous tantalum metal as an anode, covered by an insulating oxide layer that forms the dielectric, surrounded by liquid or solid electrolyte as a cathode. Because of its very thin and relatively high permittivity dielectric layer, the tantalum capacitor distinguishes itself from other conventional and electrolytic capacitors in having high capacitance per volume (high volumetric efficiency) and lower weight.
Tantalum is a conflict mineral. Tantalum electrolytic capacitors are considerably more expensive than comparable aluminum electrolytic capacitors.
Tantalum capacitors are inherently polarized components. Reverse voltage can destroy the capacitor. Non-polar or bipolar tantalum capacitors are made by effectively connecting two polarized capacitors in series, with the anodes oriented in opposite directions.
Styles of tantalum capacitors
Tantalum electrolytic capacitors are made in three different styles:
• Tantalum chip capacitors: SMD style for surface mounting, 80% of all tantalum capacitors are SMDs
• Tantalum "pearls", resin-dipped, single-ended style for PCB mounting
• Axial-leaded tantalum capacitors, with solid and non-solid electrolyte, mostly used for military, medical and space applications.
(From Wikipedia, the free encyclopedia)
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