Leadframe semiconductor package stand and method for making the same

Abstract

A method is disclosed for making a leadframe package stand having application in semiconductor packaging and microelectronic assembly in which an IC device (e.g., a bare chip IC, a wafer level package, or a chipscale package) is received for electrical connection to a PWB or for vertical package over package stacking. Electrically conductive leadframe traces are arranged in an area array circuit pattern between outer leads at the periphery of the mold body of a leadframe for connection to the PWB to inner leads for connection to the IC device. The inner lead tips terminate at each side of the IC device in groups of parallel aligned rows and columns to facilitate connection to the IC device without using intermediate bonding wires. Prior to molding, the inner leads of the conductive traces are secured by sacrificial tie-bars or adhesive tape to prevent movement of the inner leads and possible short circuits during molding. A cavity is formed in the mold body during molding so as to lie above the inner leads. After molding, the sacrificial tie-bars are separated from the inner leads, and the IC device is located in the cavity to be assembled to the leadframe to complete a leadframe package.