About Multilayer PCB
A multilayer PCB design is perhaps the next major innovation
in the world of printed circuit boards and fabrication technology.
Not only does it introduces relatively higher degree of dynamism to
existing circuit boards but is also a key element that has made a wide
range of application a reality in today’s world. However,
I am sure a key question for all those who understand PCB as well as
who do not is what exactly a multilayer PCB is and how is it
different from single sided or double sided printed circuit boards?
What Is Multilayer PCB?
Well in very simple words, multilayer PCB can be described as a
printed circuit board that is spread out over layers.
The base platform comprises of elements that are similar to a
double sided PCB. But it is exactly where the similarity ends.
What followed this basic double sided board is a complex
labyrinth of interconnects for which only the sky is the limit.
It would not be wrong to say that in many ways modern computing
is a direct beneficiary of the multilayer PCB. The fabrication for
this is quite similar to micro chip fabrication, albeit this gets
done on a significantly larger canvas.
Multilayer PCB Manufacturing
The method used for multilayer PCB manufacturing is pretty
straightforward but requires a high degree of concentration
and eye for details.
As the layers are permanently stuck together, care needs to be
taken to ensure that all the layers get registered correctly and
in the right sequence as per the drilled holes. As many as 10 layers
can be pressed together and the total number of
PCB load every time is totally dependent on the capacity of the
machines used by the manufacturer.
Multilayer PCB Design: The Key Raw Materials
In this context it is important to keep in mind that the success of
the multilayer PCB design is solely based on quality of the material used.
Therefore it becomes important for the multilayer PCB manufacturer
to use the right material and ensure appropriate orientation.
The advantage of opting for this is a wide variety of material that
can be used. Innovators have tried on a wide range of
base materials for multilayer PCB fabrication starting from
epoxy glass to copper, aluminum and even ceramic fills.
Essentially you have layers of copper foil, the core material and
prepreg adhesive sandwiched under very high temperature and
pressure to get the multiple layers.
The prepreg is what holds the various layers and lends cohesiveness
to the entire multilayer PCB fabrication.
How Is PCB Multilayer Useful For Customers?
The basic question then is how a multilayer printed circuit board
can help its potential users? Is it cost effective or is it only about
design options? Well we would say it a bit of both. It also opens
up numerous alternatives in front of customers and as we all
know when it comes to innovation, the sky is the limit.