[PCB_FORUM] Re: .4 mm pitch bga's
- From: Ron Mora <rmora@xxxxxxxxxxxxxxxxxxxx>
- To: icu-pcb-forum@xxxxxxxxxxxxx
- Date: Fri, 27 Oct 2006 09:39:29 -0700
Gino,
Wow, where will it end.
We use a .25mm pad with a .1mm hole and that's pushing it. But our application
is a high volume product.
What is the BGA pad size you are using?
Are you using stacked vias?
Are the BGA pads masked defined or etch defined.
These will all have an impact on the via pad, trace space numbers.
Are you under filling the BGA?
For the very dense designs we use ALIVH technology in an 8 layer stack up.
This allows us to put a via in pad and route directly down to any layer.
Ron
At 10:06 AM 10/27/2006 -0500, you wrote:
Everyone,
What's your recommendation for microvia sizes, line and spacing for
routing .4mm bga's?
I saw a technotes using .065mm line and space between 0.2mm pad/0.1 drill
micro via. Anyone using these in their designs?
regards,
Gino
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