Patent ID: 9202712
Filing Date: 2015-12-01
Classification: H01L

Abstract:
1. A method of manufacturing a lead frame, the method comprising the steps of: providing an electrically-conductive base material having first and second planar sides; forming a patterned conductive layer on the first planar side of the base material; etching the second planar side of the base material at portions with respect to exposed portions on the first planar side of the base material comprising the patterned conductive layer, to form partially-etched portions on the second planar side of the base material; providing a non-conductive filling material over the second planar side of the base material, wherein the filling material fills spaces inside the partially-etched portions on the second planar side of the base material to form adjacent portions of the filling material and a plurality of conductive portions on the second planar side of the base material; after the step of providing a non-conductive filing material over the second planar side of the base material, etching the exposed portions of the first planar side of the base material comprising the patterned conductive layer to form partially-etched portions on the first planar side of the base material that combine with the partially-etched portions on the second planar side of the base material to thereby form a plurality of separate conductive regions on the first planar side of the base material, each conductive region being electrically conductive with at least a respective one of the plurality of conductive portions on the second planar side of the base material, and wherein the step of etching the second planar side of the base material comprises etching a depth which is more than 60% of the thickness of the base material to form the partially-etched portions on the second planar side of the base material; after the etching of the exposed portions of the first planar side, plating the plurality of conductive portions on the second planar side of the base material.