What is PCB via

The so-called pcb via refers to the densely drilled holes on the circuit board, called "via". The PCB via is mainly composed of two parts, one is the middle drill hole, and the other is the pad area around the drill hole. The size of these two parts determines the size of the vias. When designing high-speed and high-density PCBs, designers always hope that the smaller the vias are, the better. In this example, more wiring space can be left. The smaller the vias are, the smaller their parasitic capacitance is, which is more suitable for high-speed circuits. However, the reduction of the hole size brings about an increase in cost, and the size of the vias cannot be reduced indefinitely, It is limited by drilling, plating and other technologies: the smaller the hole, the longer the drilling time, and the easier it is to deviate from the center; In addition, when the depth of the hole exceeds 6 times of the drilling diameter, the average copper plating on the hole wall cannot be guaranteed.

PCB proofingIt is normal that the number of holes drilled per square meter in the industry is within 30000. If the number of holes exceeds 30000, some factories may increase the cost of vias. Normally, more than 90% of the holes in the circuit board are within the normal range. To sum up, if the number of vias in the circuit board is too large, it will definitely directly affect the price of circuit board proofing. For example, if the number of vias in the circuit board is too large, it may take more than ten or twenty minutes to drill the board that can be drilled in half an hour, Because of the excessive number of vias in the testing process, the flying pin test or test rack can be tested in one hour, but now it needs one and a half hours or two hours to complete. This intermediate aging will definitely directly affect the price of PCB proofing.