Refers to many small area circuit boards, in order to facilitate the downstream assembly line plug-in, placement, welding and other operations, in the PCB process, it is specially combined on a board for various processing. At the end of the work, the local cutting shape (Routing) is broken between the independent panels by means of knife-jumping, but several "Tie Bar" or "Break-away Tab" with enough strength are retained, and a few holes are drilled between the panels and the edges of the panels, or V-shaped slots are cut up and down to facilitate the assembly process, and the panels can also be broken after the completion of the assembly process. Separate. In the future, more and more small boards will be assembled together. IC card is an example.