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March 2014

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Subject:
Microvias in pad
From:
Larry Brophy <[log in to unmask]>
Reply To:
(Designers Council Forum)
Date:
Fri, 21 Mar 2014 08:51:17 -0500
Content-Type:
text/plain
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text/plain (22 lines) 
Ok, another question for this very helpful community :o)

I have a micro BGA, 0.5mm pitch, 121 pads.

Each pad is 8mil on the PCB footprint as per the recommendation from the manufacture.

Now I'm going to place a microvia of 12mil with a laser hole of 4mil in some of the inner pads.  

What would you recommend for the solder resist opening for this via in pad and the solder paste opening for it?

In advance, many thanks for your help.

Larry

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