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February 2008

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Subject:
From:
Gabriela Bogdan <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Gabriela Bogdan <[log in to unmask]>
Date:
Tue, 5 Feb 2008 22:06:38 +0200
Content-Type:
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text/plain (104 lines)
Alpha omnix 338.
Gaby

----- Original Message ----- 
From: "Stadem, Richard D." <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, February 05, 2008 7:25 PM
Subject: Re: [TN] Microvoids immersion silver


It appears you have both voiding caused by outgassing and microvoiding
(champagne voiding). Your pictures of the microvoiding appear to be
classic examples similar to those that are in Don Cullen's paper that
Werner and Dave Hillman referenced earlier. However, the larger voids
are caused by something else.
What solder paste are you using? I'm guessing that it is Alpha WS609?

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gabriela Bogdan
Sent: Monday, February 04, 2008 1:55 PM
To: [log in to unmask]
Subject: Re: [TN] Microvoids immersion silver

Finished my "investigation". Attached word doc,  Steve, could you put it
on your site?
Can anybody comment or give an advice?
Thanks,
Gaby
  ----- Original Message -----
  From: Gabriela Bogdan
  To: [log in to unmask] ; [log in to unmask]
  Sent: Tuesday, January 29, 2008 8:49 PM
  Subject: Re: [TN] Microvoids immersion silver


  Decided to investigate further to qualify our vendors.
  4BGA + 2 circuits and assembly.
  Will cross section bare, after paste+reflow, after BGA assembly and
also X-ray and dye and pry.
  At least I will have fun.
  Gaby
    ----- Original Message ----- 
    From: [log in to unmask]
    To: [log in to unmask] ; [log in to unmask]
    Sent: Tuesday, January 29, 2008 8:35 PM
    Subject: Re: [TN] Microvoids immersion silver


    Hi Gaby,
    I take it what you are seeing are 'champagne voids.'
    Voids like these are 'encouraged by rough topography copper,
excessive Ag thickness, some solder paste choices and rapid cool-down
after reflow. But as Donald Cullen says in his comprehensive paper, it
"requires the "Perfect Storm" of a rather contrived combination of
parameters" to produce planar micro-voiding.
    Well Gaby, now you know it-you are "Perfect." ;-)



    Werner



    **************
    Start the year off right. Easy ways to stay in shape.

http://body.aol.com/fitness/winter-exercise?NCID=aolcmp00300000002489
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