Patent ID: 7495319

Claim:
A resin-encapsulated semiconductor device comprising: a lead frame comprising a plurality of first external terminal portions provided on a plane, a plurality of inner lead portions configured to be connected electrically with a semiconductor element, formed of back surfaces of the respective first external terminal portions and arranged at regular intervals so as to surround a region inside the inner lead portions, a plurality of step-like shaped convex portions including the inner lead portions formed as the lowermost stage of the convex portions, the uppermost surfaces of the convex portions forming a plurality of second external terminal portions; the semiconductor element comprising a plurality of connection pads flip-chip bonded to the inner lead portions via bumps; and an encapsulating resin that encapsulates at least a part of surroundings of the semiconductor element including the inner lead portions and connection pads, the first external terminal portions being arranged in a lower surface region of the encapsulating resin along a periphery of the region and the second external terminal portions being exposed on an upper surface of the encapsulating resin, wherein the convex portion has a top stage forming the uppermost surface of the convex portion and a middle stage higher than the inner lead portion connected with the connection pad of the semiconductor element, and wherein the lead frame further comprises a plurality of terminals for electrical connection provided in a grid pattern in a region inside the inner lead portions and exposed on a lower surface of the encapsulating resin, the semiconductor element further comprise a plurality of inner electrode pads within the region inside the lead portions; and the plurality of inner terminals are connected to the inner electrode pads of the semiconductor element.