Patent ID: 6492726
Filing Date: 2002-12-10
Classification: H01L

Abstract:
A method for mounting semiconductor devices, comprising:providing one or more semiconductor devices, said one or more semiconductor devices having an active side having a size with semiconductor devices having been created in said active side and a backside having a size that is equal to the size of said active side, whereby the plane of said backside is parallel to the plane of said active side, whereby contact bumps have been provided in the active surface of said one or more semiconductor devices; providing a semiconductor device package having a top surface having a size, further having a bottom surface having a size that equals the size of said top surface, said top surface and said bottom surface being in parallel planes, said package having an upward direction that proceeds from said bottom surface of said package to said top surface of said package, also having a downward direction that is opposite to said upward direction, said top surface of said package and said bottom surface of said package being interconnected by four alternatingly parallel side surfaces of said package that intersect under a ninety degree angle as observed in a cross section of a plane that is parallel with said bottom surface of said package whereby said side surfaces are further perpendicular to said bottom surface of said package when observed in a cross section of said package in a plane that is perpendicular to said side surfaces, said top surface in combination with said bottom surface and said four side surfaces enclosing said package, said package having a cavity in said top surface of said package, said cavity having an opening having a size in the plane of said top surface of said package, whereby said size of said opening is smaller than said size of said top surface of said package by a measurable amount, said cavity further having contoured sidewalls, said contoured sidewalls comprising surfaces that in an alternating sequence are perpendicular to and parallel with the plane of said bottom surface starting with a surface that is perpendicular with said bottom surface of said package when entering said cavity of said package and ending with a surface that is perpendicular to said bottom surface of said package, said surfaces in said contoured sidewalls of said cavity that are parallel with said bottom having been provided with points of electrical contact, said cavity further having a flat bottom surface that is parallel to the plane of said bottom surface of said package in addition to being in close physical proximity to said bottom surface of said package, said cavity having cross sections in one or more planes that are parallel with said plane of the bottom of said package whereby multiple cross sections of said cavity in planes that are parallel with said top surface of said package have a size, whereby said size of the surface of said cross sections when proceeding from said top surface to said bottom surface of said package is of decreasing value, said cavity having a line forming a geometric center of said cavity said line being perpendicular to said bottom surface of said package and being equidistant from each pair of parallel surfaces of said sidewalls of said package, whereby a cross section of said cavity in a plane that is parallel with the plane of said bottom surface of said package is a geometric square or rectangle with points of intersection of the diagonals of said square or rectangle coinciding with the point where said line forming a geometric center of said cavity intersects the plane of the cross section, said package having been provided with points of electrical interconnect in the bottom surface of said package, said package further having conductive plugs that connect said points of electrical interconnect provided in said surfaces inside said cavity that are parallel with said bottom surface of said cavity with said points of electrical interconnect in the bottom surface of said package; providing one or more semiconductor supporting units that provide mechanical support for mounting said one or more semiconductor devices and that further function as electrical insulators and heat conductor units between said one or more semiconductor devices, said one or more semiconductor supporting units having a top surface having a size and bottom surface having a size, whereby the plane of said top surface is parallel to the plane of said bottom surface, whereby therefore the size of said top surface is equal to the size of said bottom surface, whereby the size of the top surface of at least one of said one or more semiconductor supporting units can be matched with the size of an active side of at least one of said one or more semiconductor devices, whereby the size of a matching semiconductor supporting unit is smaller than the size of the top surface of a matching semiconductor device by a measurable amount; matching and joining at least one of said one or more semiconductor devices with at least one of said matching semiconductor support units in a plane that is parallel with the plane of said bottom surface of said package, whereby the size of the combined surface of said one or more matched semiconductor devices is about equal to the size of at least one semiconductor supporting unit, creating matched semiconductor device and device support units; inserting said matched semiconductor device and device support units into said cavity, whereby the size of the surface of a cross section of the cavity is about equal to said size of the surface of said one or more semiconductor device support units, overlaying said semiconductor device support unit with a matching semiconductor device attached thereto over a surface of said contoured sidewalls of said cavity that is parallel with the surface of said bottom surface of said package, establishing points of electrical contact of said solder bumps of said one or more semiconductor devices with said contact points provided in said horizontal surfaces in said cavity of said semiconductor package, establishing electrical contact between said solder bumps provided in said one or more semiconductor devices and said conductive plugs provided in the bottom surface of said semiconductor package, completing the overlaying of said surfaces inside said cavity that are parallel with said bottom surface of said package with matched semiconductor device and device support units; providing a metallic cover that has a top surface having a size and a bottom surface that is parallel to the plane of said top surface having a size that is equal to said size of said top surface of said metallic cover, whereby the size of said top surface of said metallic cover is about equal to the size of said top opening of said cavity in said semiconductor package; and inserting said metallic cover into said top opening of said cavity.