[SI-LIST] Re: Search for the paper about minimum BGA pad size in PCB
- From: steve weir <weirsi@xxxxxxxxxx>
- To: pangning2000@xxxxxxxxx, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 16 Jun 2005 04:46:44 -0700
Peter, assuming that you are manufacturing with via in pad, then I think
you are misallocating your space. Check with your board fab and assembly
houses, but what you propose doesn't sound like it will result in very good
yields.
Steve.
At 06:12 PM 6/16/2005 +0800, Pang Ning wrote:
>Dear Expert,
>I encountered a problem about BGA pad size in PCB. The actual ball size is
>0.6mm, and ball pitch is 1.0mm. We plan to route two 5mil traces between
>two adjacent pads, and reserve over 5mil spacing for trace/trace,
>trace/pad(or via). But in this way the BGA pad size in PCB will be only 14mil.
>
>I'm wondering if 14mil BGA pad is too small for mass production. Is there
>any paper that demonstrates the guideline for BGA ball size vs. minimum
>pad size in PCB? Can anyone provide me the linkage for the paper? Thanks
>in advance!
>
>Best Regards,
>Peter Pang
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