How to place printed circuit board components

What is a printed circuit board? How should it be placed? The usual order of placing components on a printed circuit board: Place components in fixed positions that closely match the structure, such as power sockets, indicator lights, switches, and connectors After placing these components, use the LOCK function of the software to lock them so that they will not be moved accidentally in the future; place special components and large components on the line, such as heating components, transformers, ICs, etc.; place small components .

The distance of components from the edge of the board: If possible, all components should be placed within 3mm from the edge of the board or at least greater than the thickness of the board. This is because rail grooves must be provided during mass production of assembly line plug-ins and wave soldering. At the same time, in order to prevent edge defects due to shape processing, if there are too many components on the printed circuit board and it has to exceed the 3mm range, you can add a 3mm auxiliary edge to the edge of the board, and the auxiliary edge is V-shaped. The groove can be broken by hand during production.

Isolation between high and low voltage: On many printed circuit boards, there are both high-voltage circuits and low-voltage circuits. The components of the high-voltage circuit part must be separated from the low-voltage part. The isolation distance is related to the withstand voltage to be withstood. Usually At 2000kV, the distance between the boards should be 2mm, and the distance between the boards should be increased proportionally. For example, if you want to withstand a 3000V withstand voltage test, the distance between high and low voltage lines should be more than 3.5mm. In many cases, to avoid Creepage, also slots between high and low voltages on the printed circuit board. The above is the placement method of printed circuit boards. I hope it can help you.