The introduction of the aspect ratio of the PCB
The aspect ratio of PCB is the ratio of the hole depth to the hole diameter of the PCB. The main purpose is to quantify the plating difficulty of through-holes in PCB. The aspect ratio is the board thickness/aperture; for example, if the board thickness is 100 mil and the aperture is 10 mil, the aspect ratio is 10.
The larger the aspect ratio, the more difficult the plating is. This is because capillary action is likely to occur, making the plating thicker at the edge of the copper tube, resulting in a thinner center. If the center of the plated hole is too thin, the structural integrity of the plated hole will be compromised and it will crack under thermal or mechanical stress.
When we talk about aspect ratio, we will think about the conductive vias in a PCB that connect multiple layers together. However, if we plan to have plated to the mounting holes, it is important to pay attention to the value of the aspect ratio.
The larger the aspect ratio, the more difficult the plating is. This is because capillary action is likely to occur, making the plating thicker at the edge of the copper tube, resulting in a thinner center. If the center of the plated hole is too thin, the structural integrity of the plated hole will be compromised and it will crack under thermal or mechanical stress.
When we talk about aspect ratio, we will think about the conductive vias in a PCB that connect multiple layers together. However, if we plan to have plated to the mounting holes, it is important to pay attention to the value of the aspect ratio.