Patent ID: 8110505
Filing Date: 2012-02-07
Classification: H01L

Abstract:
1. A method of manufacturing a lead frame, the method comprising: preparing a substrate comprising first and second surfaces; forming a first mask pattern on the first surface and a second mask pattern on the second surface to cover a region for a die pad and regions for at least one lead pattern; half-etching the first surface of the substrate to a first etching depth to form first etching space by using the first mask pattern as a first etching prevention layer, and half-etching the second surface of the substrate to a second etching depth to form second etching space by using the second mask pattern as a second etching prevention layer and, wherein the half-etching controls the first and second etching depths to allow thin portions in the thickness direction of the substrate to remain; removing the first and second mask patterns, and pre-plating the first and second surfaces of the substrate to form first and second pre-plating layers thereon, respectively; first filling the first etching space with an insulating material; back-etching the second etching space to extend the second etching space by using the second pre-plating layer as a third etching prevention layer, thereby completely removing the thin portions; and second filling the extended second etching space with the insulating material.