Patent ID: 7479412

Claim:
A method of producing a semiconductor device, comprising a step of bonding an adhesive film for a semiconductor to a side of a lead frame having inner leads, a step of bonding a semiconductor element to an exposed side of the lead frame, a step of connecting the semiconductor element to the inner leads, a step of sealing the exposed side of the lead frame and the semiconductor element with a sealing material, and a step of peeling off the adhesive film for a semiconductor from the lead frame and the sealing material, wherein the adhesive film comprises a support film having a thickness (B) and a resin layer having a thickness (A) and coating one or each side of the support film, and wherein the thickness (A) of the resin layer is less than 15 μm and is related to the thickness (B) of the support film by a ratio (A)/(B) of at most 0.5.