[SI-LIST] Re: Assembly holes in PCB with GND pad
- From: steve weir <weirsi@xxxxxxxxxx>
- To: Augusto Einsfeldt <aee@xxxxxxxxxxxx>
- Date: Tue, 01 Jun 2010 09:45:25 -0700
The mounting screw can compress with substantial force which can then
crack the PTH breaking connection on one or more internal layers. So
the idea is to make the PTH attachments outside the compressed region
between the fasteners.
Steve.
Augusto Einsfeldt wrote:
> Hello all,
> This maybe an OT but I guess some members here can clarify it easily.
> I am used to use mettalized holes in PCBs to connect the GND to the assembly
> chassis (frame) of the machine and it seems to work fine. In the other hand I
> have seen many PCBs for computer mother-boards and even telecom with a non
> mettalized hole of, say, 3mm diameter and several through holes inside the
> pad ring.
> Is it just to ease some manufacturing process, a quality improvement design
> or is it SI related?
>
> Thanks for your time on this matter.
>
> -Augusto
>
> .
>
>
>
>
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--
Steve Weir
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