jb Tantalum Capacitors in Different Styles: Axial, Radial and SMD-chip Versions (Size Comparison with a Match)

10μF 30 VDC-rated tantalum capacitors, solid electrolyte epoxy-dipped style.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.

Characteristics of the different oxide layers in tantalum and niobium electrolytic capacitors
Dielectric	Relative	Oxide	Breakdown	Dielectric layer
	permittivity	structure	voltage	thickness
			(V/μm)	(nm/V)
Tantalum pentoxide, Ta2O5	27	Amorphous	625	1.7
Niobium pentoxide, Nb2O5	41	Amorphous	400	2.5