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June 2000

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Subject:
From:
"Stephen R. Gregory" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 2 Jun 2000 10:53:47 EDT
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In a message dated 06/02/2000 9:39:49 AM Central Daylight Time,
[log in to unmask] writes:

<< Hi Gaby! The Xray equipment vendors have told me that Xray tubes that are
 less than 100kV have a very low probability of damaging components. Note
 the "very low probability" statement - they have not seen any customer
 issues with xray damage but they also can't totally rule out the
 possibility of damage. We have been using xray equipment with a 52kV tube
 and we have yet to have a xray damage issue. I imagine as industry use of
 xray inspection of area array increases we will find out how "probable"
 xray damage issue will be. And to add one more voice to the discussion - we
 have found the using a medium cost xray system (e.g. $30K-$60K) is a
 valuable asset in area array component solder process control. The use of
 xray equipment doesn't answer every question but having the tool available
 is important in several aspects.

 Dave Hillman
 Rockwell Collins
 [log in to unmask] >>

Hi Dave!

One thing to add about using systems that have less than 100kV power, is that
recent BGA packages are coming out with metal heatsinks in the top of them,
and you can't see through them. I have a Glenbrook RTX-113 and recently
placed a Texas Instruments BGA with the heatsink, and I couldn't see through
it. I believe I recall a Technet post from someone that ran across the same
problem with a Altera part as well...

-Steve Gregory-

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