- The spacing between the wires is based on the production capacity of the PCB manufacturer, and the spacing between the wiring and the wiring should not be less than 4MIL. The minimum line spacing is also the line-to-line, line-to-pad spacing. Well, from our production point of view, of course, the bigger the better, the better. Generally, the conventional 10MIL is more common.
- Pad aperture and pad width: According to the PCB manufacturer, the minimum pad aperture should not be less than 0.2mm if mechanical drilling is used, and the minimum pad aperture should not be less than 4mil if laser drilling is used. The hole diameter tolerance is slightly different according to the plate. Generally, it can be controlled within 0.05mm. The minimum pad width shall not be lower than 0.2mm.
- The spacing between pads: According to the processing capacity of PCB manufacturers, the spacing between pads should not be less than 0.2MM.
- The distance between the copper skin and the edge of the board: the distance between the charged copper skin and the edge of the PCB board is preferably not less than 0.3mm. If it is a large area of copper laying, there is usually a shrinkage distance from the edge of the board, which is generally set to 20mil . Under normal circumstances, due to the mechanical considerations of the finished circuit board, or to avoid the curling or electrical short circuit that may be caused by the exposed copper skin on the edge of the board, the engineer often shrinks the large-area copper laying block by 20mil relative to the edge of the board, while The copper skin is not spread all the way to the edge of the board. There are many ways to deal with the shrinkage of the copper skin. For example, draw the keepout layer on the edge of the board, and then set the distance between copper laying and keepout.
As a professional manufacturer of low power Bluetooth module, Tecksay has independently developed and produced a number of BLE Bluetooth modules that have been applied to many industries. With more than ten years of industry experience, Tecksay can customize BLE embedded solutions for customers from design, project management, function customization, system development and other aspects.