Patent ID: 7838972

Claim:
A method of manufacturing a lead frame including a lead frame main body having a die pad portion having a chip mounting surface on which a semiconductor chip is mounted, a plurality of lead portions arranged to surround the die pad portion, and a frame portion for supporting the die pad portion and the lead portions, said die pad portion having a first surface and a second surface, said lead portions having first surfaces and second surface, and said frame portion having a first surface and a second surface, wherein said first surfaces of said die pad portion, said lead portions, and said frame portion face in a first direction and wherein said second surface of said die pad portion, said lead portions, and said frame portion face in a second direction, said first direction being opposite to said second direction, wherein a first surface of the lead frame main body includes the first surfaces of the die pad portion, the lead portions, and the frame portion, and wherein said chip mounting surface is on the first surface of said die pad portion, and an adhesive film provided on a second surface of the lead frame main body, which opposes the first surface of the die pad portion to which the semiconductor chip is mounted, said method comprising: a first metal film forming step of forming a first metal film on the first surfaces of the lead portions, which oppose the second surface of the lead frame main body to which the adhesive film is provided; a second metal film forming step of forming a second metal film, whose thickness is substantially equal to a thickness of the first metal film, on the chip mounting surface of the die pad portion; and an adhesive film providing step of providing the adhesive film on the second surface of the lead frame main body by pressing after the first metal film and the second metal film are formed.