Electronics > Beginners
Drill pairs for 4 layer PCB
ZeroResistance:
What is the correct / standard way to create drill pairs for a 4 layer PCB. I will have components on both top and bottom layer.
Based on what I have read they say thru via's are the simplest and if we keep the board with only thru vias's it would be much easier for the board house.
So I have 4 layers like Top Signal, PWR plane GND, PWR plane VCC, Bottom Signal or L1, L2, L3, L4.
I was thinking of creating pairs like
L1 -> L2 Blind via
L1 -> L3 Blind via
L1 -> L4 Thru via
L4 -> L3 Blind via
L4 -> L2 Blind via
L4 -> L1 Thru via
Is this the correct way of doing it?
However thinking further regarding the manufacturing process, I guess the board house might do
Case1
Two double sided pcb,s and some insulator in between and stick them all together.
I this case they would do the double sided PCBs with thru via's so that would be L1->L2 and L3->L4 but how does a trace get connected from L1->L3 in this case?
Case2
One double sided pcb for the PWR planes, and 2 single sided PCBs one on top of the double sided and one on bottom.
In this case all board's will be seperately drilled stuck together and again drilled to get the final thru' vias.
In this case we will gett connectivity between all per what I need.
But I'd like to know the standard way of doing this. I intend to get the boards done at JLPCB.
Psi:
I had this exact question when doing my first 6 layer HDI pcb.
Sadly it was a while ago and i don't recall what the answer was.
ZeroResistance:
--- Quote from: Psi on July 08, 2019, 08:24:17 am ---I had this exact question when doing my first 6 layer HDI pcb.
Sadly it was a while ago and i don't recall what the answer was.
--- End quote ---
Good to hear, In fact now that I see some info on JLPCB website on this page https://jlcpcb.com/capabilities/Capabilities
They say
1-6 copper layers PCB prototypes
(Don't support Blind/Buried Vias)
So if blind via's are not supported how does one connect Power traces from the top layer to the internal power plane?
oPossum:
The vias connect to all copper layers.
ZeroResistance:
--- Quote from: oPossum on July 08, 2019, 08:45:22 am ---The vias connect to all copper layers.
--- End quote ---
So, If I have a component on the top layer and I need to connect its powers pin to L3 (VCC plane) how does one do that, if as you say its a thru via and connects to all layers? how does the board house isolate this via from GND (L2).
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