Lead frame and manufacturing method therefor

摘要

An inner lead of a lead frame has an outer end portion extending so as to be connected with a side surface of an etching stop layer and with an upper surface of an outer lead. The outer lead is formed by etching both surfaces of a metal base, and the inner lead is formed by plating metal on the metal base with a resist layer used as a mask. The pitch of the outer lead can be made fine, and a bonding strength of the inner lead to the outer lead can be increased.