Patent ID: 7820528
Filing Date: 2010-10-26
Classification: H01L

Abstract:
1. A method for forming leaded molded packages comprising the steps of: placing a lead frame assembly having conductive leads, flag portions with electronic chips attached thereto and electrically coupled to the conductive leads into a molding apparatus having a plurality of lead channels shaped to prevent flow of encapsulating material between adjacent conductive leads, wherein the lead frame assembly is free of dam-bars; crimping the conductive leads within the lead channels; molding portions of the lead frame assembly with an encapsulating layer while leaving portions of the conductive leads exposed to form a molded lead frame assembly; and singulating the molded lead frame assembly into individual leaded molded packages wherein the step of crimping includes the steps of: placing the conductive leads into the lead channels having tapered portions with widths less than widths of the conductive leads; and closing the molding apparatus to force the conductive leads into the tapered portions thereby forming seals between the conductive leads and the lead channels.