Patent ID: 8338963

Claim:
A microelectronic assembly, comprising: a substrate having first and second opposed surfaces, each extending in a first direction and a second direction transverse to the first direction, the substrate having first and second openings extending between the first and second surfaces, the first opening elongated in the first direction and the second opening elongated in the second direction; a first microelectronic element having a front surface facing the first surface, and bond pads exposed at the front surface and aligned with the first opening, the first microelectronic element having a rear surface opposite the front surface and an edge extending between the front and rear surfaces and extending in the second direction; and a second microelectronic element having a front surface facing the rear surface of the first microelectronic element and projecting in the first direction beyond the edge of the first microelectronic element, the front surface of the second microelectronic element having first and second opposed edges extending between the front and rear surface of the second microelectronic element and extending in the second direction, and having a first outer region adjacent the first edge, a second outer region adjacent the second edge, and a central region disposed between the first and second outer regions, each of the first and second outer regions and the central region having equal width such that the central region extends a middle third of a distance between the first and second edges, the second microelectronic further having bond pads disposed in the central region aligned with the second opening, wherein the bond pads of the first and second microelectronic elements are electrically connected to conductive elements of the substrate.