Patent ID: 8021932

Claim:
A manufacturing method for a semiconductor device, comprising the steps of: (a) preparing a substrate including a plurality of bonding leads, and having an insulating film formed over a surface thereof, the bonding leads being exposed to an opening of the insulating film; (b) mounting a semiconductor chip having a rectangular planar shape, and including a main surface with a plurality of pads formed thereover, and a back surface opposite to the main surface, over the bonding leads of the substrate via protruding electrodes formed over the pads such that the main surface is opposed to the surface of the substrate; (c) filling a gap between the substrate and the semiconductor chip with underfill material; and (d) providing a plurality of external terminals at the back surface of the substrate for being coupled to an external portion, wherein the opening of the insulating film of the substrate is formed along an outer peripheral shape of the semiconductor chip, and includes a first opening portion corresponding to a corner of the semiconductor chip, and a second opening portion opposed to the first opening portion, wherein a plurality of through holes to be coupled to the external terminals are arranged outside the opening, wherein the bonding lead includes a lead wire derived from the through hole into the opening, and a mounting portion over which the protruding electrode is mounted, wherein the bonding lead derived in a direction from an outside of a side of the substrate into the opening, and the bonding lead derived in a direction from a center of the semiconductor chip into the opening are alternately arranged in the opening, wherein the opening of the substrate is formed in a rectangular shape having a planar shape with four corners, wherein the first opening portion has a first corner of the four corners, and the second opening portion has a second corner thereof, and wherein a distance between the second corner and a corner of the semiconductor chip adjacent thereto is shorter than that between the first corner and a corner of the semiconductor chip adjacent thereto, and wherein in the step (c), the underfill material is dropped from the first opening, so that the gap between the substrate and the semiconductor chip is filled with the underfill material.