Patent ID: 8541891

Claim:
A semiconductor device, comprising: a first substantially rectangular chip having a top surface on which wires, electrode pads and a chip mounting area are provided; a first dam formed on the top surface of the first substantially rectangular chip around the electrode pads and the chip mounting area so as to cover the wires; a second substantially rectangular chip mounted on the chip mounting area in a flip-chip manner, the second substantially rectangular chip having first and second sides that are substantially perpendicular to each other in a plan view; an under fill formed by filling liquid resin into a space between a top surface of the second substantially rectangular chip and the top surface of the first substantially rectangular chip; a second dam formed on the top surface of the first substantially rectangular chip, between the first dam and the first side of the second substantially rectangular chip, and extending along the first side; and a third dam formed on the top surface of the first substantially rectangular chip, between the first dam and the second side of the second substantially rectangular chip, and extending along the second side, wherein the first dam protects the wires and keeps the wires isolated from the liquid resin.