600A 2.9.3.2 "BGA --Copper Defined Lands  -- Class I/II/III Acceptable
== 'soldermask does not encroach on the land, except at the conductor
attachment' -- Nonconforming == does not meet...


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Friday, March 30, 2007 11:16 AM
To: [log in to unmask]
Subject: Re: [TN] Solder Resist Encroachment onto BGA pads

Where does it say that it is not allowed? 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paymon Sani
Sent: Friday, March 30, 2007 11:02 AM
To: [log in to unmask]
Subject: [TN] Solder Resist Encroachment onto BGA pads

Hello All,

 

Does anybody know why IPC does not allow any solder resist encroachment
onto the BGA copper defined lands for PCBs?


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