Capacitance and voltage for rail decoupling
The TAJS106K006SNJ: 10 µF at 6.3 V — a common decoupling value for 3.3 V and 5 V rails, with enough voltage margin for a 3.3 V rail to stay below the 6.3 V ceiling even during start-up transients.
ESR and ripple current
4 Ohm ESR is typical for a 1206 tantalum at this capacitance — higher than a ceramic MLCC, but the tantalum construction delivers stable capacitance across temperature and voltage bias, which matters when the rail sees a wide DC bias swing.
