Tantalum capacitors are electrolytic capacitors which use tantalum metal as the anode and passivated tantalum pentoxide as the dielectric. They are polarized capacitors with superior frequency and stability characteristics. Their capacitance doesn’t change with age significantly.
Please note that tantalum capacitors are very sensitive to reverse polarization. If a reverse polarity voltage is applied, the dielectric oxide breaks down, sometimes forming a short circuit. This short circuit may later cause thermal runaway and destruction of the capacitor.
Comparision between different kinds of capacitors
||Wide array of
|Good high frequency
|High breakdown level
||Electrolyte leakage limits life.
Large package size.
|Capacitance varies depending on voltage and temperature.
There is polarity
Less package variety.