PCB Libraries Forum : Minimum Trace Width/Spacing for BGA https://www.PCBLibraries.com/forum/ Mon, 20 Apr 2026 21:26:24 +0000 Wed, 11 Feb 2015 19:46:20 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=1556 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Minimum Trace Width/Spacing for BGA : Yes, I would highly recommend...]]> https://www.PCBLibraries.com/forum/minimum-trace-width-spacing-for-bga_topic1556_post6322.html#6322 Author: Tom H
Subject: 1556
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.


]]> Wed, 11 Feb 2015 19:46:20 +0000 https://www.PCBLibraries.com/forum/minimum-trace-width-spacing-for-bga_topic1556_post6322.html#6322 <![CDATA[Minimum Trace Width/Spacing for BGA : Thank you Tom,Actually, my plan...]]> https://www.PCBLibraries.com/forum/minimum-trace-width-spacing-for-bga_topic1556_post6321.html#6321 Author: SandroLanot
Subject: 1556
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.


]]> Wed, 11 Feb 2015 17:35:06 +0000 https://www.PCBLibraries.com/forum/minimum-trace-width-spacing-for-bga_topic1556_post6321.html#6321 <![CDATA[Minimum Trace Width/Spacing for BGA : The numbers in Green are Mils....]]> https://www.PCBLibraries.com/forum/minimum-trace-width-spacing-for-bga_topic1556_post6319.html#6319 Author: Tom H
Subject: 1556
Posted: 11 Feb 2015 at 3:12pm

The numbers in Green are Mils.

]]> Wed, 11 Feb 2015 15:12:39 +0000 https://www.PCBLibraries.com/forum/minimum-trace-width-spacing-for-bga_topic1556_post6319.html#6319 <![CDATA[Minimum Trace Width/Spacing for BGA : Guys (&amp; Gals),Can somebody...]]> https://www.PCBLibraries.com/forum/minimum-trace-width-spacing-for-bga_topic1556_post6317.html#6317 Author: SandroLanot
Subject: 1556
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!
]]> Wed, 11 Feb 2015 15:03:30 +0000 https://www.PCBLibraries.com/forum/minimum-trace-width-spacing-for-bga_topic1556_post6317.html#6317