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by ipc.org (Smail3.1.28.1 #2)
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At 04:25 PM 2/9/96 MST, you wrote:
>
> I have a 14-layer SMT digital, polyimide, impedance controlled board per
>IPC-D-275,Class3.
>The coupon requires a section D. What really is the difference between
>Option 1 and Option 2
>and how does the conductor routing for all of the layers work out in this
>section.
>
> o--------------o o o o o o o o
> /
> /
> o--- o o o o o o o
>
>
> o--- o o o o o o o
> \
> \
> o-------------o o o o o o o o
>
>The above is my best attempt at drawing a Section D, that I think I need.
> My question is
>about the routing between these vias....."so that the interconnects in a
>specific hole are
>separated to the greatest extent possible." (IPC-D-275 page 82 7.3.7.2
>Option 2 third para-
>graph)
>
> Thanks ahead of time,
> DaveS
>
Dave,
The explanation could be rather lengthly for this forum. However, I would be
happy to discuss the differences and other criteria, surrounding the "D"
coupon. I can be reached at: Gary Ferrari
Tech Circuits, Inc
(203)269-3311
Regards,
Gary Ferrari
Chairman - IPC-D-275
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