Mechanical characteristics of PCB through holes

　　When the PCB through-hole is large, our wiring space will be very small. Obviously, we want to use small PCB through-holes, but how small is appropriate? Even if the PCB plate making via is already very small and the PCB plate making via is smaller, more lines can be laid on the PCB to improve the wiring density. For products with limited product size, designers have to make the PCB through holes on the board smaller and smaller. The smaller the PCB through hole, the smaller the parasitic capacitance. This means that the smaller the PCB through hole, the better it will work in high-speed situations. In the fastest PCB design, small PCB through holes are mandatory. Of course, the cost of generating small PCB through holes is higher. In engineering design, it is inevitable that the higher the performance, the higher the cost, and PCB through holes are no exception. At present, we have three principles for PCB through holes:

　　Small PCB through-holes occupy a small area

　　Small PCB boards have smaller parasitic capacitance through holes

　　Small PCB boards have higher through-hole costs