Patent ID: 7239024

Claim:
A semiconductor package assembly, comprising: a die having electrical contact pads for external connection and a height; a predominantly metal substrate having a recessed area with a depth at least equal to the height of the die; and solder balls between the electrical contact pads of the die and patterned circuitry on the substrate in the recessed area thereby mounting the die to the substrate and connecting to the substrate circuitry; wherein the substrate comprises a dielectric layer on the recessed side insulating the patterned circuitry extending into the recessed area, the die is mounted in the recessed area with electrical connections provided between the electrical contact pads of the die and the patterned circuitry in the recessed area, vias are formed through the dielectric layer separating the metal substrate from the patterned circuitry, and a plurality of solder ball connections are made to the metal of the substrate from individual ones of the contact pads of the die, providing direct, conductive heat transfer between the die and the metal of the substrate.