Parallel Plate Capacitance                  Calculate the capacity of parallel plates or thin strips given                   length (L), width (W), spacing (S), and Er.                  Units:  inches                  Enter W,L,S, and Er (W,L,S,Er) [<Enter>=Quit] ? _

You're trying to improve your real world circuit schematic by "sucking in" the capacitance of circuit board mounting pads. What is the parasitic capacity of a 1/8 inch square pad on a piece of .062 in. thick teflon-glass with Er=2.55 ?

Here is the output calculation:

                C = 0.145 pF