AnBer: Normal PCB manufacturing process is to to use 1.2 mil copper (also known as 1/2 ounce copper) on the inner layers and a subtractive process (etching) to remove unwanted copper.
Outer layers are originally (the same) 1.2 mil copper then etched to provide the desired features, then all the through holes for vias are drilled through the stack, and an additional 1.2 mils of copper plated on top of the original copper. This as well provides the copper plating inside the drilled holes to form the via connections between layers. So, the outer layers are 1.2 mils of rolled, dead soft copper plus another 1.2 mils of hard plated copper for a total of 2.4 mils (also known as 1 Ounce copper.) --- Graham == On Thursday, November 20, 2014 7:56:43 AM UTC-6, AnBer wrote: > > Hi Gerald, > > Regarding PCB stackup, I loooked at the layer stackup defined in the BBB > Altium PCB file. > I can see that: > - Top and bottom signal layers are* 2.4 mil* copper > - Inner layers (signal and power planes) are *1.2 mil* copper > > How much *plating *is there on top and bottom layer? > Is 2.4 mils just copper or copper + plating? > > I am trying to do some pre-layout sim for a BBB and a cape and I need to > model the PCB. > > Thanks in advance > Antbert > > > On Wednesday, February 8, 2012 9:00:30 AM UTC+1, manatarms wrote: >> >> Dear All >> >> Does someone have the stackup of the BeagleBone PCB? I couldn't find >> it on the hardware design page and it would help many people who want >> to do their own design. >> > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
