OSH Park 4 layer stackup and impedance data

Note: If you want to use this data for designing your own PCBs, please ensure that my stackup data matches what OSH Park is currently using.

Here’s some data on the OSH Park 4 layer stackup:

osh park 4 layer stackup data from website

If you want a 50 ohm trace on the top layer and the second layer is ground (as it should be) then you want the trace width to be 14.47 thousands of an inch:


I used Agilent LineCalc this time. It performs an actual e-mag simulation to synthesize the correct line width. I am quite confident that this is the correct value given the inputs.


Table completed

I actually completed the table around March 2013 but I neglected to update my blog. Here are a couple pictures:

DSC_0003 DSC_0007I skipped a lot of steps. Leave a comment if you have any questions.


I just found a bunch of pictures of the leg building process, etc:

01-DSC_0001 02-DSC_0002 03-DSC_0003 04-DSC_0004 05-DSC_0005 06-DSC_0006 07-DSC_0007 08-DSC_0008 09-DSC_0009 10-DSC_0010 11-DSC_0011 12-DSC_0012 13-DSC_0013 14-DSC_0018