All About Multilayer Boards

By definition multilayer boards have three or more layers. Multilayer boards are the mainstream of electronic devices, including consumer products such as portable cameras and cellular phones. As personal computers become more powerful, mainframe computers are being replaced in many applications by smaller machines. As a result, the use of highly sophisticated multilayer boards which have a larger layer count and have incorporated surface mount technology to enhance these capabilities. As the pwb have had to address the issues of higher speed, higher density, and the rise of surface mount components that use both sides of the board, the need to communicate between layers has increased. At the same time the space available for vias has decreased, causing a continuing movement towards smaller holes. With more holes on the board comes the decline of the use of holes that penetrate the entire board, which use space on all layers. As a result, the use of buried and blind vias has started to become a standard part of the multilayer board technology.

The manufacturing cost of these sequential technologies is not necessarily directly cheaper than conventional multilayer technology, However an example of eight layer conventional structure can be reduced to four layer structure, reducing the cost for packaging density.

Modern electronic packaging has become very complex. The choice of which packaging technology to use is governed by many factors. The main factors are cost, electrical requirements, thermal requirements and density. Material selection is the final consideration. Multilayer printed circuit boards play an important role in electronic packaging.