the basic rules of PCB board layout

Basic rules for components' layout

1. It is called a module that achieve the same function of the relevant circuit according to the circuit module layout.The circuit module components should be used in the nearest centralized principle, while digital circuits and analog circuits separately;

2. Under the bottom of sleeve resistance, inductance (plug-in), electrolytic capacitors and other    components will avoid to via the hole, so as not to wave after welding hole and component shell    short circuit;

3. The distance from the edge of the component to the board edge is 5mm;

4. The outside of the mounting element pad is greater than 2 mm from the outside of the adjacent      cartridge element;

5. Metal shell components and metal parts (shielding boxes, etc.) can not be collided with other      components, and can not close to the printed wire and pad.The spacing should be greater than      2mm. Positioning holes, fastener mounting holes, oval holes and other square holes in the plate    from the side of the board size is greater than 3mm;

6. Heating element can not be close to the wire and thermal components; high-heat devices to be      balanced distribution;

7. The power outlet should be arranged around the printed circuit board as far as possible,and the power outlet that connected to the bus bar terminals should be arranged in the same side. In particular,it should not be taken to place the power outlet and other solder connectors between the connectors, to facilitate the design of these sockets, connectors and power cables. Power outlet and welding connector layout spacing should be considered to facilitate the plug plug power plug;