Patent ID: 7049170

Claim:
A manufacturing method comprising: (1) obtaining an interposer comprising: a semiconductor substrate; one or more first primary conductive contact pads attachable to circuitry placed above the interposer; one or more second primary conductive contact pads attachable to circuitry placed below the interposer; and one or more conductive paths passing through the semiconductor substrate and connecting at least one of the first primary contact pads to at least one of the second primary contact pads; wherein each of the second primary contact pads is provided by a conductor formed in a corresponding via in the semiconductor substrate and protruding downward out of the via and out of the interposer at a bottom surface of the interposer, the conductor providing a downward protrusion underneath the via at the bottom surface of the interposer; (2) obtaining an intermediate integrated circuit packaging substrate comprising: a dielectric substrate or a plurality of dielectric substrates attached to each other; one or more first secondary conductive contact pads attachable to circuitry above the intermediate substrate; one or more second conductive contact pads attachable to circuitry below the intermediate substrate; one or more conductive paths each of which connects at least one first secondary contact pad of the intermediate substrate to at least one second secondary contact pad of the intermediate substrate; wherein each of the one or more first secondary contact pads of the intermediate substrate is formed in a corresponding via in the top surface of the intermediate substrate, each via extending into at least one of the dielectric substrates; (3) inserting the protrusions formed by the conductors of the interposer into the corresponding vias of the intermediate substrate and attaching the protrusions to the first secondary contact pads of the intermediate substrate in the vias in the intermediate substrate.