Patent ID: 7138298

Claim:
A method of producing a semiconductor device including a semiconductor chip and a lead frame, the semiconductor chip having an active surface on one side and an inactive surface on the other side, the lead frame having an island portion and a lead portion, the method comprising: a chip joining step of joining the semiconductor chip to the island portion of the lead frame with the inactive side of the semiconductor chip facing the island portion; a connecting step of connecting, with a bonding wire, the lead portion of the lead frame and a predetermined portion of the active surface of the semiconductor chip; a resin sealing step of sealing the semiconductor chip and the bonding wire with protective resin covering at least the active surface and a sidewall of the semiconductor chip; and a grinding step of simultaneously grinding or polishing the inactive surface of the semiconductor chip and the protective resin covering the sidewall of the semiconductor chip, the grinding step including grinding the island portion of the lead frame prior to grinding the inactive surface of the semiconductor chip.