Patent ID: 7786565

Claim:
A semiconductor apparatus comprising: a semiconductor chip including a power semiconductor device constructed by using a wide band gap semiconductor, the semiconductor chip having an upper surface and a lower surface opposite to the upper surface; a first base material made of an electrically conductive material and electrically connected to a part of the lower surface of said semiconductor chip; a heat conducting member coming in contact with a part of the upper surface of said semiconductor chip opposite to the lower surface and releasing heat directly from said semiconductor chip; and an encapsulating material for encapsulating said semiconductor chip and said heat conducting member, wherein the semiconductor apparatus further comprises a second base material made of a metal material and disposed on a part of said upper surface of said semiconductor chip, wherein said power semiconductor device is a vertical element, wherein a part of said first base material is extruded outside said encapsulating material and works as a first external connection terminal, wherein a part of said second base material is extruded outside said encapsulating material and works as a second external connection terminal, wherein a first intermediate member made of an electrically conductive material and a second intermediate member made of a material having lower heat conductivity than said first intermediate member are provided under the lower surface of said semiconductor chip and between said first base material and said semiconductor chip, wherein the first intermediate member and the second intermediate member touch the lower surface of the semiconductor chip and the first base material, and an area where the second intermediate member touches the lower surface of the semiconductor chip is larger than an area where the first intermediate member touches the lower surface of the semiconductor chip, and wherein the semiconductor chip and the first base material are electrically connected with each other through the first intermediate member, and wherein an ohmic electrode is disposed on an entire surface of the lower surface of the semiconductor chip.