A semiconductor device comprising active areas and a structure. The active areas are formed as predetermined shapes on a substrate and arranged relative to a grid having first and second tracks which are substantially parallel to corresponding orthogonal first and second directions; The active areas are organized into instances of a first row having a first conductivity and a second row having a second conductivity. Each instance of the first row and of the second row includes a corresponding first and second number predetermined number of the first tracks. The structure has at least two contiguous rows including: at least one instance of the first row; and at least one instance of the second row. In the first direction, the instance(s) of the first row have a first width and the instance(s) of the second row a second width substantially different than the first width.