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Minimum Trace Width/Spacing for BGA
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SandroLanot View Drop Down
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Joined: 11 Feb 2015
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    Posted: 11 Feb 2015 at 3:03pm

Guys (& Gals),

Can somebody please help advice what is the min trace width/spacing for 0.80 mm x 0.80 BGA?

Thanks!
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Tom H View Drop Down
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Points: 5719 		Post Options Post Options   Thanks (1) Thanks(1)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 11 Feb 2015 at 3:12pm

The numbers in Green are Mils.

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Points: 13 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SandroLanot Quote  Post ReplyReply Direct Link To This Post Posted: 11 Feb 2015 at 5:35pm
Thank you Tom,

Actually, my plan is to use VIA18D9A26P (plugged from top open on bottom) if not near a pad on the bottom, and VIA18D9A26PTB plugged and cover with solder mask from both sides.
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Points: 5719 		Post Options Post Options   Thanks (2) Thanks(2)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 11 Feb 2015 at 7:46pm

Yes, I would highly recommend that you "Tent" the vias on the BGA side and leave the holes open on the bottom side.

If you plug both sides, super heated gas in the hole could pop through the top or bottom solder mask but if you leave the bottom open it will let the heated gas during assembly reflow escape.

If you want to cover both top and bottom holes I recommend that you fill the holes with something (over-plate, silver epoxy, solder mask) to eliminate the air in the hole.

Super heated trapped air does things in assembly that damage the finished product. The last thing you need is popped air through solder mask under a BGA that you can't see.


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