Patent ID: 6720207
Filing Date: 2004-04-13
Classification: H01L

Abstract:
A method of making a leadframe, comprising the steps of:a) forming a frame rail, a die pad, multiple internal inner lead portions and multiple external inner lead portions out of a single metal plate, wherein the die pad is supported by joining/supporting members that extend inward from the frame rail, the internal inner lead portions are connected to the die pad so as to surround the die pad, and the external inner lead portions are connected to the frame rail; b) forming convex portions in respective parts of the internal and external inner lead portions so that each said convex portion formed in that part of associated one of the internal inner lead portions is spaced apart from the die pad and that each said convex portion formed in that part of associated one of the external inner lead portions is spaced apart from the frame rail, the convex portions being formed on respective surfaces of the internal and external inner lead portions opposite to a surface of the die pad on which a chip will be mounted; c) placing a lead retaining member on respective surfaces of at least the internal inner lead portions and the frame rail and thereby getting the internal inner lead portions and the frame rail retained by the retaining member, the surfaces on which the retaining member is placed being either the same as, or opposite to, the surface of the die pad on which the chip will be mounted; and d) removing, from at least some of the internal inner lead portions, respective parts thereof located between the convex portions and the die pad, thereby forming internal inner leads that have been selectively isolated from the die pad.