Patent ID: 7696594

Claim:
A printed circuit board assembly (PCBA), the PCBA comprising: a printed circuit board (PCB) comprising a thermal pad and input-output (IO) pads, wherein the thermal pad contains a plurality of vias; a quad pack flat no-lead chip (QFN) soldered to the printed circuit board, the QFN comprising a thermal pad and IO pads; and regions of solder coupling the pads of the printed circuit board with the pads of the QFN, wherein a total area of the regions of solder coupling the thermal pad of the QFN and the thermal pad of the PCB (thermal pad solder regions) is between 50% and 120% of a total area of the IO pads for the PCB and the total area of the regions of solder for the thermal pad is less than 50% of an area of the PCB thermal pad; wherein: the thermal pad solder regions possess a plurality of different shapes based upon a design, the thermal pad solder regions constituting rectangular thermal pad solder regions possessing a plurality of different sizes and orientations; and each region of solder is separated from each via by at least the diameter of the via.