Patent ID: 8114713

Claim:
A method of manufacturing a lead frame comprising the steps of: forming an Ni layer having a specified thickness on both front and back surfaces of a metallic base material; forming a first mask over the Ni layer on the front surface, the first mask having a pattern to protect a region for placing a semiconductor device and a region for providing a bonding wire; spraying the first mask with an etching solution to reduce a thickness of a part of the Ni layer exposed from the first mask; removing the first mask; forming second masks over the Ni layer on front and back surfaces of the metallic base material respectively, each of the second masks having a predetermined pattern; etching a part of the Ni layer and a part of the metallic base material which are located below an exposed region of the second masks; removing the second mask; and forming a Pd-plated layer and an Au-plated layer.