A PCB is a printed circuit board. PCBs are a part of our everyday lives; Computers, Cellphones, Calculators, Wrist-watches and every electrical component we interact with on a daily basis.
The most common shape for PCB is rectangle. Many people also prefer to have the corners rounded, as this decreases the possibility of edge-cracking. The shape of PCB highly depends on where you are going to place the board, and what your mechanical requirements are (the final box where the product is placed).
Usually, there are 4 big holes in the board, each hole in one corner. These holes are used to hold the board in place using a patch or a PCB holder. The diameter is more than 2 millimeters, and it is plated.
Of the several materials used for the boards, six are the most widely manufactured: FR-1, FR-2, FR-3, FR-4, CEM-1 and CEM-3. “FR” stands for “flame retardant”. FR 1, 2 and 3 are essentially the same, with only minor differences in properties. They are not suited for building multilayer boards. The same is true for CEM-1.
FR-4 and CEM-3 are two laminates that can be used for multilayer boards. Of the two, FR-4 is more widely manufactured, and hence is cheaper. It can be used for single and multilayer boards, and has excellent thermal tolerance up to 130°C.
The next time you wonder why your new electronic device does not work according to your expectations, the problem may be in the wrong design and manufacturing of printed circuit boards (PCBs) – a part that mechanically supports and connects electrical components differently. However, poor design and production of PCBs can be overcome using companies that offer high-quality PCB assembly services.