Patent ID: 9281218
Filing Date: 2016-03-08
CPC Classification: H01L,Y10T

Claim Text:
1. A method of manufacturing a lead frame comprising: (a) providing an electrically conductive layer having a plurality of holes at a top surface, said plurality of holes form a structure of leads and a die pad on said electrically conductive layer; (b) filling said plurality of holes with a non-conductive material and leaving selected areas of the electrically conductive layer exposed; (c) attaching an electrically conductive foil on said top surface of said electrically conductive layer and said non-conductive material, such that said electrically conductive foil is in electrical communication with said electrically conductive layer, and wherein said electrically conductive foil is in direct physical contact with said non-conductive material that fills said plurality of holes and said conductive foil covers the entire top surface of said non-conductive material, in cross-section, that fills said plurality of holes; and (d) etching said electrically conductive foil to create a network of leads, die pad, bus lines, dam bars and tie lines, wherein said bus lines connect said leads to said dam bar, said dam bar is connected to said tie line and said tie line is connected to said die pad; wherein said etched electrically conductive foil maintains electrical communication between the leads and die pad after bottom portions of the leads have been isolated in subsequent processing steps.