SNLA426 june 2023 DS320PR1601 , DS320PR410 , DS320PR810 , SN75LVPE5412 , SN75LVPE5421
Back-drilling is a PCB manufacturing process in which the undesired conductive plating in the stub section of a via is removed. To back-drill, use a drill bit slightly larger in diameter than the drill bit used to create the original via hole. When via transitions result in stubs longer than 15 mils, back-drill the resulting stubs to reduce insertion losses and to make sure that they do not resonate.