The ideal strategy from the placement and fixation standpoint in assembly is for the designer to place these being a mirror graphic, where identical packages are placed immediately guiding one another (imagine a RAM adhere). In the case the place deals are mismatched, the component arrangement can even be mismatched. https://metalpcbcopperbasedboard49371.snack-blog.com/31321788/the-basic-principles-of-4-layers-pcb-with-ic-carrier