PCB Stack-Up -- Part 5 - Ten-Layer Boards [pic] PCB Stack-Up Part 5. Ten-Layer Boards A ten-layer board should be used when six routing layers are required.  Ten- layer boards, therefore, usually have six signal layers and four planes.  Having more than six signal layers on a ten-layer board is not recommended.  Ten-layers is also the largest number of layers that can usually be conveniently fabricated in a 0.062" thick board.  Occasionally you will see a twelve-layer board fabricated as a 0.062" thick board, but the number of fabricators capable of producing it are limited.. High layer count boards (ten +) require thin dielectrics (typically 0.006" or less on a 0.062" thick board) and therefore they automatically have tight coupling between layers.  When properly stacked and routed they can meet ……