Via Capacitance

Via capacitance is calculated as:

C = \frac{0.55 ε_{r} T D_{1}}{D_{2} - D_{1}}

Where,

$D_{2}$: Diameter of clearance hole in the ground plane [cm]
$D_{1}$: Diameter of pad surrounding via [cm]
$T$: Thickness of PCB [cm]
$ε_{r}$: Relative electric permeability of PCB material
$C$: Parasitic via capacitance [pF]

Consider a signal coming from back side of the board to the topside of the board through a via. $T$ = 0.157 cm thickness board, $D_{1}$ = 0.071 cm, $D_{2}$ = 0.127 cm.

$C$ = 0.51pF