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I want to design a board with 6 layers up to 1.8mm thickness,120ohm diff and 90ohm diff ,SE 50 ohm and the manufacturer sent me this stackup: enter image description here

  1. 12 mil for SE-50ohm not too thick?
  2. what is the material between layers 1 to 2?
  3. what is the material between layers 2 to 3 ? how do you identify whether that is Prepag or Core? Every manufacturer has his unique symbols!
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1 Answer 1

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  1. If you need thinner, get a different stackup. Tell the manufacturer to provide you with a different stackup because you need the 50Ohms to be thinner. The manufacturer calculated the stackup so it's up to him.

  2. The material is a 1080 from the 185HR family from Isola, it's a prepreg.

  3. That's the core, it's made of 3x7628 material: https://www.isola-group.com/wp-content/uploads/data-sheets/185hr-laminate-and-prepreg__Dk_Df_Tables.pdf

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