Patent ID: 8102667

Claim:
A spatially optimized pattern for surface mount pads on a ball grid array package, comprising: an array of surface mount pads arranged in rows and columns, and spaced less than or equal to 0.5 millimeters measured center-to-center, the array comprising T pads divided into N groups of pads, where T and N are positive integers; each group of pads consecutively numbered G x where 1≦X≧N; each pad in each consecutively numbered group G x having S z adjacent empty spaces, where S z =(G x −1); a number of pads P x in each of groups G x equivalent to the total number of pads having the same quantity S z of adjacent empty spaces, where 0≦X≧T; each of consecutively numbered groups G x having (P x *S z ) fanout possibilities; a total number of fanout possibilities, FP, equal to Σ 1 N (P x *S z ); wherein the spatially optimized pattern has a quality score equal to FP/T; and wherein the quality score is greater than or equal to 2.0; wherein a total area A of the surface mount pads is A=T*(π*(pad diameter/2) 2 ) and wherein the A/(the area of the bottom surface of the ball grid array) is greater than 0.3.