Patent ID: 7772043

Claim:
A manufacturing method for a semiconductor device comprising: preparing a lead frame having Cu or Fe—Ni; fixing the lead frame on a lead frame hold means; after fixing the lead frame, circulating the lead frame and the lead frame hold means in a plating line; forming a first plating film layer having a metal material of Sn on the lead frame; and forming a second plating film layer having a metal material of Sn—Bi on an outermost surface of the lead frame, wherein Bi included in a plating liquid that forms the second plating film layer is introduced into a plating liquid that forms the first plating film layer by the lead frame hold means, and the Bi included in the plating liquid that forms the first plating film layer is controlled in such a way that the Bi in the first plating film layer becomes below 1 wt. %. relative to the Sn in the first plating film layer.