Patent ID: 6798056
Filing Date: 2004-09-28
Classification: H01L,H05K,Y02P

Abstract:
A semiconductor module, comprising:a substrate having a plurality of pad electrodes on a first surface; a lower layer semiconductor package mounted on said substrate; and an upper layer semiconductor package mounted on said substrate while arranged in a position substantially overlying said lower layer semiconductor package; wherein said lower layer semiconductor package and upper layer semiconductor package include a package body, and a plurality of leads protruding in parallel respectively from opposing side portions of said package body and electrically connected to said pad electrodes, and said pad electrodes having said leads of said upper layer semiconductor package connected, and said pad electrodes having said leads of said lower layer semiconductor package connected are alternately arranged, said leads include a lead drawn-out portion horizontally drawn from a side portion of said package body, a lead downward portion extending from said lead drawn-out portion down to a surface of said substrate and a lead foot portion continuing to a tip end of said lead downward portion and contacting said pad electrode, said leads have a dambar residual portion protruding toward said lead adjacently protruding from same said package body in any position between said lead drawn-out portion and said lead downward portion, and inner surfaces of said lead downward portions of said upper layer semiconductor package are positioned outside outer surfaces of said lead downward portions of said lower layer semiconductor package, wherein said leads have a section including said dambar residual portion, wider than other sections.