Why we discuss the rigid flex PCB use in high density applications?
First of all we have to clear that rigid flex PCB’s high density is compared with normal PCB board’s.
Special in some CEM 1 PCB or rigid PCB, the density is less than rigid flex PCB.
In fact, HDI PCB board has higher density than rigid flex PCB.
But the density of HDI PCB is not his post discussion.
The control of impedances factor in rigid flexible PCB design
If you have some electronic design knowledge, you may know the control of impedances were very difficult.
Some rich experience PCB engineers use the flex material to design controlled impedance.
First the flex material properties work very well in high speed controlled impedance designs.
This means the electronic performance of flex material is very good.
Then is the design method of the control of impedances.
4MCPCB experts told us that the flex material can allow better control of impedance.
That’s the reason rigid flex PCB has to consider the control impedances factor.
The circuit traces the design of rigid flex PCB
Compare with metal core PCB, rigid flex PCB have more narrow circuit trace.
You may find most of the rigid flex PCB board have more than 4 layers, the metal core PCB usually less than 3 layers.
Rigid flex PCB allows narrow traces to give way to high density device population.
That’s the reason why rigid flex PCB assembly board has high density.
The assembly method of rigid flex PCB
We have mentioned the narrow circuit trace resulting high density.
And also can be assembly denser device populations and lighter conductors.
In other words, you can design, a higher density assembly board for additional product features.