PCB layout with BGA

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I am using the old Tango for DOS to create an board with a 1... - Apr 10, 2003 by

We don't know anything about using "old Tango for DOS". ... - Apr 11, 2003 by davef

Giuliano

#24101

PCB layout with BGA | 10 April, 2003

I am using the old Tango for DOS to create an board with a 1mm BGA chip. How to define clearance around the surface pads?

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davef

#24113

PCB layout with BGA | 11 April, 2003

We don't know anything about using "old Tango for DOS".

First, consider the fabricator of your part as the THE most appropriate place to look for layout recommendations. We've discussed the heirarchy of sources for layout information previously here on SMTnet.

After that, by "define clearance around the surface pads" do you mean solder mask? If so, NSMD. Make the solder resist aperture layer between 0.004- to 0.006-inch larger than the BGA pad to give normal clearance. SMD. Typical overlap would be 0.002 to 0.005 inches. [Your fabricator should have input regarding their process capabilities.] The reliability of this type of solder joint is still in review.

If you mean escapes, look here: http://www.pcbstandards.com/downloads/Metric%20Environment/General%20Documentation/Technical%20Papers/Metric%20BGA%20Routing/Metric%20BGA%20Routing.ppt

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