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May 2005

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Tue, 3 May 2005 13:55:50 EDT
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TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
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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
[log in to unmask] (mailto:[log in to unmask])
818-768-3919

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