Patent ID: 6137184
Filing Date: 2000-10-24
Classification: H01L

Abstract:
A flip-chip type semiconductor device comprising:a semiconductor pellet having a plurality of bump electrodes formed on one main surface thereof, with a recess formed on each of said bump electrodes, said recess having at least one recess wall surface oriented substantially perpendicular to the main surface;a wiring board having pad electrodes formed corresponding to said bump electrodes, said wiring board being disposed opposite to said semiconductor pellet and the bump electrodes contacting the pad electrodes;a resin for causing said semiconductor pellet and said wiring board to adhere to each other; anda protrusion formed on each of said pad electrodes, said protrusion having at least one protrusion wall surface oriented substantially perpendicular to the main surface and adapted to mate with said recess wall surface, said protrusion further covered with a first metal layer and a second metal layer covering said first metal layer, said first metal layer being harder than both the bump electrode and said second metal layer, wherein said protrusion is press-fitted into the corresponding bump electrode so as to mechanically and electrically connect said pad electrode and said bump electrode.