PCB design is an important stage before the production of PCB circuit boards. A reasonable and perfect design not only saves production costs, but also enables the circuit board to achieve good circuit performance and heat dissipation function. Below, let the engineer summarize the common problems in PCB circuit board design for you.

1. Single sided pad: Do not use filler blocks as pads for surface mount components, instead use single sided pads.

2. Through holes and pads: Do not replace through holes with pads.

3. Text requirements: Character annotations should be avoided as much as possible, especially for surface mounted components and pads on the Botten layer, and characters and annotations should not be printed. For printing characters on large copper sheets, first spray tin before printing characters, and the characters are not cut; All characters outside the board will be deleted.

4. Green oil requirements for resistance welding: When designed according to specifications, the welding points of components are represented by pads, and these pads (including through holes) will automatically not be subject to resistance welding. Except for solder pads, if certain areas on the board need not be coated with solder mask ink, solid graphics should be used to represent the areas that do not need solder mask ink on the corresponding layers. For boards with BGA, the through-hole solder pads must be covered with green oil on the component surface.

5. Requirements for copper laying area: Large area copper laying, whether made into a grid or laid with solid copper, requires a distance of more than 0.5mm from the edge of the board.

6. Expression of appearance: The appearance processing drawing should be drawn on the Mech1 layer, preferably with the word CUT and size written in the groove; When drawing the contour lines of square holes, grooves, etc., it is necessary to consider the arc of the machining turning point and endpoint.

7. The expression of opening a long hole on a solder pad: The drilling hole diameter of the solder pad should be set to the width of the long hole, and the contour of the long hole should be drawn on the Mech1 layer. Note that both ends are circular arcs, and consider the installation size.