A printed wiring board semiconductor package or PWB power core comprising singulated capacitors embedded on multiple layers of the printed wiring board semiconductor package wherein at least a part of each embedded capacitor lies within the die shadow and wherein the embedded, singulated capacitors comprise at least a first electrode and a second electrode. The first electrodes and second electrodes of the embedded singulated capacitors are interconnected to the Vcc (power) terminals and the Vss (ground) terminals respectively of a semiconductor device. The size of the embedded capacitors are varied to produce different self-resonant frequencies and their vertical placements within the PWB semiconductor package are used to control the inherent inductance of the capacitor-semiconductor electrical interconnections so that customized resonant frequencies of the embedded capacitors can be achieved with low impedance.