Classical 2-dimension interconnection is compared to new technologies,
using the 3rd dimension. The area of use for 3D interconnection techn
iques are presented from the stacking of identical chips (memories for
example), to the stacking of heterogeneous elements leading to the fi
rst microsystems, the middle step being the stacking of heterogeneous
chips (calculation node for example). improvement in interconnection t
echnology opens great perspectives for more complex microsystems.