If it is a mirror BGAs placement, the only issue is the rework of one of them.

Reuven ROKAH
e mail: [log in to unmask]


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Guy Ramsey
Sent: Monday, May 05, 2008 9:49 PM
To: [log in to unmask]
Subject: Re: [TN] BGAs on opposing sides

Steve's right and for those cases where it is an issue Loctite make a BGA
cornerbonder that is liquid through first reflow, allows the part to self
center then hardens and will hold the part in place during the second side
reflow. Over cure to 230°C and it becomes brittle so rework is possible.


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Richard Olsen
Sent: Monday, May 05, 2008 2:29 PM
To: [log in to unmask]
Subject: [TN] BGAs on opposing sides

Hello,

I have a board before me with multiple BGA's on both sides. In some places
they oppose each other.
Does anyone have any manufacturing ideas for soldering the BGA's?
One I have heard is to mask the first side BGA's and heat through the mask,
BGA, board and finally the pads of the second BGA, finally removing the mask
when done.

Thanks,
Rich


Richard Olsen
Quality Manager/ Sales & Customer Service RNB Enterprises
17816 North 25th Avenue
Phoenix Arizona
85023-2108

Tel - 602-889-3463
Cel - 602-740-2244
Fax - 602-863-2274
Toll Free (800)-270-7585
www.rnbent.com

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