What is a Via on a PCB?

A VIA hole in a PCB consists of two pads in corresponding positions on different layers of the board, that are electrically connected by a hole through the board. The hole is made conductive by electroplating. A via consists of: Barrel — conductive tube filling the drilled hole.

What is a buried via?

Blind and buried vias are used to connect between layers of a PCB where space is at a premium. A Blind Via connects an outer layer to one or more inner layers but does not go through the entire board. A Buried Via connects two or more inner layers but does not go through to an outer layer.

What is via filling?

Via filling is the process of filling the vias with a non-conductive paste in order to close them. Usually this is required for PCBs with a large amount of drills when the fixation in assembly is done by vacuum lifter. By closing the via the runoff of solder is also prevented.

Why do we need GND?

Electrical devices are “grounded” when they connect to grounding devices for safety reasons. Grounding provides a safe “path of least resistance” for stray voltage to follow. Without grounding, power surges or equipment damage could render electrical circuits dangerous or destructive.

What are ground vias?

Ground Plane Vias These vias are holes that go through the board and connect the two sides to each other. They connect the components directly to the ground points, which connect through low impedance to all of the circuit’s other ground points. They also help to keep the length of return loops short.

What is common ground PCB?

Common Ground plane A ground plane, typically made of copper, covers all the areas of a PCB that do not have components or traces on them. For instance, if your board has two layers, the rules state that you should pace the ground plane on the bottom layer and the traces and components on the top layer.