PCB layout design rules

21 june

PCB LAYOUT DESIGN is actually the design process of printed circuit boards, including schematic design, electronic component database registration, design preparation, block division, electronic component configuration, configuration confirmation, wiring and final inspection. In the whole process, no matter which process is found, it must be returned to the previous process for reconfirmation and correction.

The design needs to be set at different times . Generally speaking, the layout stage can use large grid points for device layout:

For large devices such as ICs and non-positioning connectors, 50 to 100 mil grid precision can be used for layout. For passive small devices such as resistors, capacitors and inductors, 25 mil grids can be used for layout. The accuracy of the device is good for device alignment and layout.

Under normal circumstances, all components should be placed on the same side of the board when the PCB layout is designed. When the top component is too dense, some devices with limited height and low heat can be placed, such as chip resistors and chip capacitors. And the patch IC is placed on the lower layer.

Under the premise of ensuring electrical performance, the components should be placed on the grid and arranged parallel and perpendicular to each other, so that they are neat and beautiful. Under normal circumstances, the components are not allowed to overlap; the components are arranged in a compact manner, and the components should be evenly distributed throughout the layout. Closely consistent.

The minimum spacing between adjacent components of the board on the board should be less than 1MM, and the edge of the board is generally not less than 2MM. The optimal shape of the board is rectangular, and the aspect ratio is 3:2 or 4:3. When the board scale is larger than 200MM by 150MM, the mechanical strength that the board can withstand should be considered.