Abstract: An integrated circuit package includes a first lead frame attached to the top surface of a substrate or interposer on which the die is mounted, and a second lead frame attached to the bottom surface of the interposer. The first lead frame is connected to bonding pads on the die by conventional means, and the second lead frame is attached to different bonding pads on the die by means of traces in the interposer and vias which extend through the interposer. The result is a package having a substantially greater lead density than packages which contain only a single lead frame.

Abstract: An interposer between the leads of a leadframe and the ends of wires connected to an integrated circuit die is described herein. The interposer may consist a polyimide tape or other insulating material with conductive traces formed thereon, each trace electrically connecting an inner bonding pad to an outer bonding pad formed on the tape. The outer bonding pads are generally arranged around the periphery of the interposer and are bonded to respective ends of the leadframe. An integrated circuit die is placed in approximately the center of the interposer surrounded by the inner bonding pads. An automatic bonder then bonds wires to the bonding pads on the die and to the inner bonding pads on the interposer. The die is now electrically connected to the leadframe via the traces on the interposer.