Patent ID: 7102210

Claim:
A lead frame comprising: a plurality of leads arranged in parallel, wherein each of said leads is constituted by being divided into two portions of an inner lead portion and an outer lead portion, said inner lead portion has a fine inner lead portion and a middle inner lead portion for interconnecting said fine inner lead portion and said outer lead portion, said fine inner lead portion has a first thickness, each of said middle inner lead portion and said outer lead portion has a second thickness and a second width, said fine inner lead portion has a tip of a first width, and a rear stage expanded in width from the first width of said tip to the second width of said middle inner lead portion, the first thickness is smaller than the second thickness, and the first width is smaller than the second width; and a plurality of spare leads each of which is constituted by being divided into two portions of a spare inner lead portion and a spare outer lead portion, wherein said spare leads are arranged in parallel to be apart from said leads in areas between said middle inner lead portions of the adjacent leads, and said spare leads are respectively arranged from a boundary between said middle inner lead portion and said fine inner lead portion of the adjacent lead to the area of said outer lead portion side.