PCB News - Common PCB board design requirements

Among the commonly used types of printed PCB circuit boards, the matters needing attention in layout design are described in detail as follows:

1) Single panel: This type of panel is usually used when the cost is lower. In layout design, sometimes components or jumper wires are needed to skip the traces of the circuit board. If there are too many, you should consider using double panels.

2) Double panel: Double panel can be used or not used PTH. Because the PTH board is expensive, it will only be used when the complexity and density of the circuit require it.

In the layout design, the number of wires on the component surface must be kept to a minimum to ensure that the required materials are easily available.

In PTH boards, plated through holes are only used for electrical connection and not for component installation. For economic and reliability considerations, the number of holes should be kept to a minimum.

To choose single-sided or double-sided, it is very important to consider the surface area (C) of the components, and the ratio of it to the total area of the printed circuit board (S) is an appropriate constant ratio. The installation is useful. It is worth noting that "US" usually refers to the area of one side of the panel.

Under normal circumstances, the choice of single-panel or double-panel must meet the most effective cost utilization. According to experience, the cost of a double-sided printed circuit board with plated through holes is 5-10 times that of a single-sided board. Similarly, the cost of assembling components is also an important aspect that needs to be considered. The cost of assembling a single-sided printed circuit board (manual) is about 25% -50% of the cost of the circuit board, and assembling a single-sided printed circuit board with PTH For the components of the double-sided printed circuit board, the cost is 15% -30% of its cost.

The printed circuit board not only provides mechanical support, but also connects the components mounted on it. Therefore, for the designer of the printed circuit board, it is necessary to understand the entire physical size of the panel (outer frame size), the location of the mounting hole, the height limit and related details. The following are the main factors to be considered in the mechanical design of printed circuit boards:

1) The best panel size suitable for printed circuit board production;

2) The position of panel mounting holes, brackets, splints, clips, shielding boxes and radiators;

3) The special placement requirements of components are similar to those operated on the front panel, such as buttons, rheostats, etc.

4) Suitable aperture for component installation;

5) The assembly method of the circuit board (vertical installation/horizontal installation);

6) Suitable fixing devices for heavier components;

7) The assembled circuit board must have compression resistance and shock resistance during transportation;

8) Cooling method;

The above is an introduction to the design requirements of commonly used PCB boards. Ipcb is also provided to PCB manufacturers and PCB manufacturing technology