[eagle] Re: BGA Tools
kk7p at wavecable.com
Mon Jan 15 18:22:49 PST 2007
> Besides, I wouldn't send out a single BGA-containing board to my
> TERRESTRIAL customers without having it X-Ray scanned first to check the
> connections. I certainly wouldn't send one into space without a scan.
> Are you planning on purchasing an XRay machine as well?
No, no plans on an X-ray machine, Matt. High-volume manufacturers of
boards with BGAs dont; X-Raythem either.
Once you get the thermal profiles worked out, it makes reliable connections.
The equipment comes with a test board for 4 positions, and 4 BGA devices
that contain a pattern of jumpers so that you can determine when it is
in fact properly soldered down. This helps to calibrate the thermal
This is the same machine JPL used to place the BGAs in the Spirit and
Opportunity rovers. Not sure if they X-rayed these or not, but it is
the same exact placement tool set. In fact, Zephyrtronics includes a
NASA report on how to use the machine for reliable placements.
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