A through hole is a hole that passes through a trace on a PCB layer, and its sole purpose is to connect to another trace on another layer. They are usually found in multi-layer PCBs, which require each layer to be connected in one way or another.

There are three different versions of vias that can be incorporated into any multilayer PCB:

Blind vias: They connect the outer layer of the PCB to the inner layer of the PCB, but no further. Therefore, if we have a four-layer PCB, the first two layers will have holes drilled through the traces, but not the third or fourth layer.

Buried vias: They connect two or more internal layers to each other. Again, in our four-layer PCB, the second and third layers will be drilled and connected, while the outer layers (first and fourth layers) will not show any holes and look like the board The blank spot.

Vias: As you might have deciphered by now, these are drilled verbatim through the entire board to connect the first and fourth layers of the outer layer (or other combinations that connect the four layers together).

Similar to Mario’s green tube, the through hole passes through the PCB and connects the multi-layer trace wiring.

Encourage the growth of your design through understanding correctly

For the overall task of saving the princess, it does not seem to be important, except for the fact that these green tubes do not seem to be of any benefit, because it is so satisfying to jump in. On the other hand, Vias plays a vital role in multilayer PCBs.

Many times, it is better again in this small age, and we are left with the task of saving as much space as possible. With vias, we are theoretically now able to bypass all the spaces on the top layer to steal the trace route (all our components are sitting there) and route everything needed in the second, third or even fourth layer. For designers looking for space-saving techniques, this may be a godsend.

When implementing blind vias, buried vias or through-hole vias on your circuit board, another benefit you will get is to reduce the parasitic capacitance between the traces, otherwise it will cause serious damage to your design. This reduced parasitic capacitance is due to the improvement of shortening the traces. Although not necessarily the main reason, if the design is correct, you will definitely benefit from adding vias to the design.

Drilling tolerances must be very precise to successfully implement vias in the design.

Other considerations before passing the application

Although you may jump out of your seat and look for the sign-in position, grab your horse, because there are some disadvantages to adding filters to your design (why there are always disadvantages?!).

Vias and multilayer boards are carried together. When performing any operations on multiple circuit boards, cost factors must be considered. This includes drilling through holes in exactly the same position, not just one hole, but two, three, or even four boards. If there is even a slight tolerance error in the drilling and stacking process, the circuit board may also be rubbish.

To alleviate this situation, manufacturers must reduce their machinery and tolerances to a fraction of a millimeter, which of course will increase the cost of the manufacturing and assembly process. As always, be sure to contact your manufacturer as far in advance as possible to get its limitations and capabilities before you walk through the rabbit hole (or green tube, whichever you prefer).