Patent ID: 7183643

Claim:
A microelectronic assembly comprising: (a) a circuit panel having top and bottom surfaces; (b) a plurality of units each including one or more microelectronic elements, each said unit having a top surface, a bottom surface and edges extending between said top and bottom surfaces, each said unit having terminals at column positions on at least one of said surfaces, said units being disposed in a plurality of stacks, each said stack including a plurality of said units superposed on one another in top-surface to bottom surface arrangement with the top surfaces of the units facing toward the top of the stack and with terminals at the same column positions in different units of the stack aligned with one another in columns extending upwardly and downwardly within the stack, said stacks being mounted to the circuit panel so that a first set of said stacks are disposed in a first orientation with the top surfaces of the units facing upwardly and a second set of said stacks are disposed in a second orientation with the top surfaces of the units facing downwardly, at least some of said stacks of said first set and at least some of said stacks of said second set being disposed side-by-side with one another.