PCB News - PCB layout rules

PCB circuit board is an important part of all electronic equipment, and PCB layout is related to the performance of the circuit. Although many software can realize PCB automatic layout,but because of the increasing signal frequency,engineers still need to understand and master PCB layout rules and principles in many cases.

PCB layout rules

1. Under normal circumstances, all the components should be arranged on the same surface of the circuit board,only the top layer of the component is too dense,in order to put some highly limited and small heat devices,such as chip resistance, chip capacitance, chip IC,etc.,in the lower layer.

2. On the premise of ensuring the electrical performance, the components should be placed on the grid and arranged parallel or vertically to each other, so as to be neat and beautiful. Overlapping components are not allowed under general circumstances; The arrangement of components should be compact, and the components should be evenly distributed and uniform in density throughout the layout.

3. The minimum distance between the adjacent pads of different components on the circuit board should be more than 1MM.

4. Generally not less than 2MM from the edge of the circuit board. The best shape of the circuit board is a rectangle, length to width ratio of 3:2 or 4:3. When the circuit board size is greater than 200MM by 150MM, the mechanical strength that the circuit board can withstand should be considered.

In PCB layout design, the unit of the circuit board should be analyzed, and the layout design should be carried out according to the function. When all the components of the circuit are laid out, the following principles should be followed:

1) Arrange the position of each functional circuit unit according to the circuit process, so that the layout is convenient for signal flow, and keep the signal in the same direction as far as possible.

2) Take the core components of each functional unit as the center and carry out the layout around them. Components should be uniformly, integrally and compactly arranged on the PCB to minimize and shorten leads and connections between components.

For most PCB beginners, it is very important to understand and master the layout principles and rules of PCB. This article is only a brief introduction to the layout principles and rules of PCB. If you want to understand and master the layout principles and rules of PCB as soon as possible, you need to pay more attention and learn in your work.