What is the purpose of PCB via?
The main purpose of any PCB via is to provide a conductive path for passing an electrical signal from one circuit layer to another by means of a plated hole wall. However, there are different types of vias and different options for the final appearance of the vias on the PCB surface.
What is a through hole via?
Thru-hole: This is the standard via that is used on PCBs to provide a conductive path for signals going from one layer to another. These vias are mechanically drilled all the way through the board and can get down to 0.006 inches in size.
How are VIAs used in a multilayered PCB?
Vias are the means to interconnect different layers on and within the multilayered PCBs. These are used to electrically and thermally connect the traces, pads, and polygons on different layers of a PCB. In simple words, Vias are copper cylinders that are placed or formed in holes that have been drilled through one or more layers in a PCB . Fig. 1.
Why do you need a blind via on a PCB?
Blind vias, being mechanically drilled, can be utilized to make a connection between an outer layer to a nearby layer. Also, for some cases, to an additional layer underneath and then careful planning is needed to achieve better results. A blind via can only be seen on one side of the PCB when compared with a through-hole via.
What happens when a layer of PCB is laminated?
When those steps are complete, another layer is laminated onto the outside of the stack. After lamination, the new layer undergoes another cycle of blind drilling and plating. This connects the outermost layer to the adjacent layer.
Where are the sacrificial Vias on a PCB?
Normally, most PCB manufacturers put sacrificial vias on their PCBs on a section of the production board. So that you can slice the vias and examine the cross-sections to determine the effectiveness of the electroplating process. Depending on the functionality, Vias can be divided into three types, such as :