board" most commonly means "printed circuit assembly" (with components). Components are generally soldered to the PCB both to connect them electrically and to fix them mechanically. Printed circuit boards are used in HAL almost all electronic products and some electrical products. Currently, the production and assembly of
insulation. For a multilayer printed circuit with a specific stack-up, it must be taken into account that the internal tracks with controlled impedance are shielded by copper planes and for this reason only the thickness of the insulation between layers and tracks and the track thickness must be taken
the adjacent substrate layers. The soldering mask soldermask is made of a HAL fluid substance like an ink and is applied in a thin layer similar to varnish on the entire surface of the printed circuit less on the soldering pads and it also has a role