Patent ID: 8610259

Claim:
A microelectronic unit, comprising: a semiconductor element consisting essentially of semiconductor material and having a front surface, a rear surface, a plurality of active semiconductor devices adjacent the front surface, a plurality of conductive pads exposed at the front surface, and an opening extending through the semiconductor element, wherein at least one of the conductive pads at least partially overlies the opening and is electrically connected with at least one of the active semiconductor devices; a first conductive element exposed at the rear surface for connection with an external component, the first conductive element extending through the opening and electrically connected with the at least one conductive pad; and a second conductive element extending through the opening and insulated from the first conductive element, wherein the at least one conductive pad overlies a peripheral edge of the second conductive element, and wherein the second conductive element directly contacts an interior surface of the semiconductor material within the opening.