Patent ID: 8193091

Claim:
A resin-encapsulated semiconductor device comprising: a die pad; a semiconductor chip mounted on an upper portion of the die pad; first leads provided around the die pad; at least a second lead supporting the die pad, wherein the number of first leads is greater than the number of second leads; a metal wire connecting a top surface of one of the first leads and the semiconductor chip; and an encapsulating resin for encapsulating the semiconductor chip, the die pad, and the first and second leads such that at least a portion of each bottom surface of the first and second leads is exposed from a bottom surface of the resin-encapsulated semiconductor device as first and second external terminals, wherein on a side of the die pad, the first external terminal is provided parallel to the second external terminal, the bottom surface of the second lead between the portion to be the second external terminal and the die pad is encapsulated so that each edge line, on the side of the die pad, of the first and second external terminals of the first and second leads forms a straight line, distance between the second and the first external terminal is constant, said first and second leads are provided on four sides surrounding the die pad, and at least one second lead is arranged on each of the four sides surrounding said die pad, and all of each second lead are arranged parallel to an adjacent first lead.