Patent ID: 7265444

Claim:
A resin molded semiconductor device comprising: a heat sink having a support face; a semiconductor chip mounted on said support face; a lead frame electrically connected to said semiconductor chip; a resin molded case which forms a space for accommodating said semiconductor chip therein, has an opening on an upper face thereof defined by side walls including a plurality of linearly arrayed resin projections above a top surface portion of said side walls, and molds said lead frame and heat sink; and a glass cap which closes said opening and is secured to said resin molded case by a bonding agent layer, wherein said resin molded case has a thermal coefficient of expansion matched with that of said heat sink, whereby said heat sink and said mounted semiconductor chip have a total percent warping of about 0.01% or less, and wherein mechanical stress between said molded case and said glass cap is absorbed by said bonding agent layer having a thickness greater that the height of said linearly arrayed resin projections above said top surface portion of said side walls.