Patent ID: 7608918

Claim:
A semiconductor device comprising a heat-radiative and metallic support plate; a plurality of lead terminals having positive terminals connected to said support plate and negative terminals disposed around said support plate; a first semiconductor stack which has first and second semiconductor elements layered and mounted in turn on said support plate, and a first electrically conductive and radiating solder layer mounted between said first and second semiconductor elements; a second semiconductor stack which has third and fourth semiconductor elements layered and mounted in turn on said support plate, and a second electrically conductive and radiating solder layer mounted between said third and fourth semiconductor elements; and a control circuit for controlling the switching operation of said first to fourth semiconductor elements so that said first and fourth semiconductor elements and said second and third semiconductor elements are alternately switched, and thereby when one of said first and second semiconductor elements and one of said third and fourth semiconductor elements are turned on together, the other of said first and second semiconductor elements and the other of said third and fourth semiconductor elements is turned off together; wherein said first to fourth semiconductor elements contribute to form a H-type bridge circuit; each of said first to fourth semiconductor elements is a switching element; each positive terminal of said lead terminals is connected to each end of a corresponding side surface in said support plate away from said first and second semiconductor stacks; each of said first and third semiconductor elements has a bottom electrode electrically connected to said support plate through different brazing materials; said first semiconductor element has an upper electrode electrically connected to a lower electrode in said second semiconductor element through said first radiating solder layer; said third semiconductor element has an upper electrode electrically connected to a lower electrode in said fourth semiconductor element through said second radiating solder layer; each of said second and fourth semiconductor element has a control electrode electrically connected to control electrodes in said control element through different lead wires; and each of said second and fourth semiconductor elements has an upper electrode electrically connected to said negative terminals through different lead wires.