US Patent 7569474 Method and apparatus for soldering modules to substrates

A method and apparatus for attaching a module such as a semiconductor device, having an array of contacts arranged thereon in a given pattern to a substrate such as a printed circuit board comprises applying an array of solder blocks to the array of contacts on the module. The module is then positioned on the substrate so that the array of solder blocks contacts the array of contact pads on the substrate. Heat is then applied to reflow the solder blocks to provide mechanical and electrical connection of the module to the substrate.