PCB News - Basic rules of circuit board component layout design

Basic rules of PCB board component layout design

1.Layout according to circuit modules, and related circuits that achieve the same function are called a module. The components in the circuit module should adopt the principle of nearby concentration, and the digital circuit and the analog circuit board should be separated.

2. Do not mount components and devices within 1.27mm around non-mounting holes such as positioning holes, standard holes, and 3.5mm (for M2.5) and 4mm (for M3) around 3.5mm (for M2.5) and 4mm (for M3).

3. The distance between the outside of the component and the edge of the board is 5mm.

4. Heating elements should not be in close proximity to wires and heat-sensitive elements; high-heating elements should be evenly distributed

5. The power socket should be arranged around the printed circuit board as much as possible, and the power socket and the bus bar terminal connected to it should be arranged on the same side. Particular care should be taken not to arrange power sockets and other welding connectors between the connectors to facilitate the welding of these sockets and connectors, as well as the design and tie-up of power cables. The arrangement spacing of power sockets and welding connectors should be considered to facilitate the plugging and unplugging of power plugs.

6. Avoid placing via holes under the components such as horizontal resistors, inductors (plug-ins), electrolytic capacitors, etc., so as to avoid short circuits between the via holes and the component housing after wave soldering.

7. The distance between the outside of the mounting component pad and the outside of the adjacent interposing component is greater than 2mm.

8. Metal shell components and metal parts (shielding boxes, etc.) can not touch other components, can not be close to printed lines, pads, and their spacing should be greater than 2mm. The size of the positioning holes, fastener installation holes, oval holes and other square holes in the board from the edge of the board is greater than 3mm.

9. Layout of other components All IC components are aligned on one side, and the polarity of polar components is clearly marked. The polarity of the same printed board cannot be marked more than two directions. When two directions appear, the two directions are perpendicular to each other.

10. There should be no through holes on the SMD pads to avoid the loss of solder paste and cause false soldering of the components. Important signal lines are not allowed to pass between the socket pins.

11. The patch is aligned on one side, the character direction is the same, and the packaging direction is the same.

12. The polarized devices should be kept consistent as far as possible in the direction marked with the polarity on the same board

The above is an introduction to the basic rules of circuit board component layout PCB design.