The named of multi-layer flexible PCB board
This paper is the third article on series flexible PCB board.
First of all we should know the name of multi-layer flexible PCB board.
Usually multilayer flexible PCB board also named multi flex PCB, or multi FPC.
But if you place a PCB order from your supplier, Emma recommends you use multi-layer flexible PCB board.
Because some people may do not know the short named of multi-layer flexible PCB board.
The stackup of multi-layer flexible PCB board
Compare with one or two layer flexible circuit board, the multi-layer flexible PCB board have more complex stackup.
That the reason why some small flexible PCB factory cannot manufacture multi-layer flexible PCB board.
We want to use four layer flexible PCB board as example, to discuss the stackup of multi-layer flexible PCB board.
Four layer flexible PCB board has four circuit layers as conductive layers.
Each of those four circuit layers can carry current, those were some holes to connect difference circuit layer.
Then each of conductive layers has two outside insulating layers on top and bottom.
Those insulating layers protect two circuit layer cannot connect directly.
The thickness of multi-layer flexible PCB board
It’s hard to discuss the thickness of multi-layer flexible PCB board.
Because differ layer flexible PCB board have difference thickness.
So we have to select a normally widely use layer flexible PCB board as example.
Four layer flexible PCB board is the most widely FPC type.
Our flex experts told us the overall thickness range of 9 to 25 mils.
But this data depend on differing the materials use by the flexible PCB factory.
The applications of multi-layer flexible PCB board
Multi-layer flexible PCB board become more and more popular.
The most important reason is that multi-layer flexible PCB board can provide good electronic performance and flexible bending ability.
But to design a good multi-layer flexible PCB board is not easy.
Because controlled impedance and EMI shielded designs are so hard to most flexible PCB designers.
Some small flexible PCB factory just provide one or two layer FPC.
So what is the application of multi-layer flexible PCB board?
Our multi-layer flexible PCB engineers told Emma, typically found in telecommunications and RF and Microwave products.
And the price is cheap than rigid flex PCB cost.
There are more and more engineer choose multi-layer flexible PCB board due it’s good electronic performance now.
The electronic parameter of multi-layer flexible PCB board
Emma doesn’t want to discuss too deep in electronic parameter of multi-layer flexible PCB board.
Because it’s really very complex, even some green flexible PCB board engineer doesn’t exact electronic parameters.
Each of circuit layers in multi-layer flexible PCB board can carry current.
And the carrying current ability range from a few million-amps to several amps.
The note of multi-layer flexible PCB board
Due to multi-layer flexible PCB board several circuit layers, it’s flexible bending ability not good as two layer flexible circuit board.
The main reason is that first consider overall thickness characteristics during multi-layer flexible PCB board design process.
To most multi-layer flexible PCB board, fewer circuit layers have better flexible bending ability.
Top three articles of flexible PCB
