Tyros will have many questions for heavy copper PCB when they do the job for heavy copper PCB design, and good news is that today we will list some FAQs to help tyros to work better for their heavy copper PCB.


heavy copper pcb1


Question 1: Why we cover copper with PCB?
Answer 7: To improve the power efficiency, reduce the high frequency interference and make the PCB looks nice.


Question 2: Can we also have additional 2 x 1 Oz layers with a 4 or 5 or 6 layer 20 Oz PCB ?
Answer 2: Yes, you can design 1OZ copper layer together with 20OZ layers


Question 3: Can you mix different copper thickness on one board, such as 10 OZ on Top & Bot but 5OZ on L2 & L3?
Answer 3: We can make 10OZ mix with 5OZ at the same board. Just make sure copper thickness on the same layer should be the size.


Question 4: Any plated through holes (PTH) and vias and clearances in all layers have to follow the 10 OZ size rules!
Answer 4: Yes, it has to follow up the rules for the layers which has thickest copper thickness. For Via, maybe you design 0.2mm on 1OZ, but as you know, this VIA also go through the 1O OZ layer, so you have to consider the 10 OZ layer. If this PTH is a blind or buried hole, then things will be different. For clearness, 1 OZ layer doesn’t need to follow up rules of 10 OZ layers.


Question 5: What’s the thickness of copper we will cover on the circuit board generally?
Answer 5: 70% circuit boards covered with 35um. But for those PCBs which have to bear excessive current, the thickness of the copper may be 70um, 105um and 140um in rare cases.


Question 6: What is the minimum thickness of 4 and 5 and 6 layer 20 Oz boards?
Answer 6: 4L & 6L: Min Thickness: 1.6mm


Meanwhile if you would like to know more about heavy copper PCB, or you have questions for your heavy copper PCB design job or other questions about PCB, please don’t hesitate to contact us, we are always here for your PCB job.