We have a tough brd to manu. and want to know what kind of annular ring
requirement should we sign up for.
This is for SPACE so it requires IPC-6012 class 3, w/ exceptions to annular
ring.
12 layers
1) Burried vias 7-11
2) Burried vias 6-11
3) Blind vias 6-12
4) Burried and blind vias have 16 mill pads for vias (thickness ~ 60 mils)
5) Thru holes (~90 mils) 18 mil pads.
6) Cavity brds w/ broad side coupled diff. impedance control
Thanks for your help in advance
Rush
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818-768-3919
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