PCB News - Screen printing specifications in PCB design

Screen printing specifications in PCB design:

1. The polarity of polarized components is clearly indicated on the silk screen, and the polarity direction mark is easy to identify.

2. The direction of the directional connector is clearly indicated on the silk screen.

3. All components, mounting holes, and positioning holes have corresponding silk-screen marks. In order to facilitate the installation of the board, all components, mounting holes, and positioning holes have corresponding silk-screen marks. The mounting holes on the PCB use H1. H2……Hn for identification.

4. Silk-screen characters follow the principle of left to right and bottom-up. Silk-screen characters should follow the principle of left-to-right and bottom-up as far as possible. For components with polarities such as electrolytic capacitors and diodes, try to keep them in each functional unit. The direction is the same.

5. There is no silk screen on the device pads and tin tracks that need to be tinned, and the device number should not be blocked by the device after installation. (The density is higher, except for those that do not need to be silk-screened on the PCB)

In order to ensure the reliability of the soldering of the device, it is required that there is no silk screen on the device pad; in order to ensure the continuity of the tin channel, it is required that there is no silk screen on the tin channel; The device is blocked after installation; the silk screen should not be pressed on the via hole and the pad, so as to avoid the loss of part of the silk screen when the solder mask window is opened, which will affect the training. The silk screen spacing is greater than 5mil.

6. There should be a barcode position mark on the PCB. When the PCB board space permits, there should be a 42*6 barcode silk screen frame on the PCB. The position of the barcode should be considered for easy scanning.

7. PCB boardname, date, version number and other information screen printing position should be clear. The PCB file should be printed with the board name, date, version number and other information of the finished board, and the position is clear and eye-catching.

8. The identifier of the device on the PCB must be consistent with the identification symbol in the BOM list.

9. The complete manufacturer's relevant information and anti-static signs should be on the PCB.