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March 2010

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Subject:
From:
Werner Engelmaier <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Werner Engelmaier <[log in to unmask]>
Date:
Mon, 1 Mar 2010 19:09:37 -0500
Content-Type:
text/plain
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text/plain (287 lines)
 Joyce,
That depends on the reliability you want to achieve, the package size, the delta-CTE and the cyclic delta-T.

Werner
Upcoming workshops:
May 21, IPC Int. Conference on Reliability and Quality of Lead-Free Electronics, Frankfurt, Germany,
      “Reliability Issues and Solution Options for Pb-Free Soldered Electronic Products”
May 26, FED Seminar, Stuttgart, Germany,
     “Bleifreie Lötprozesse—Frühausfälle, Qualität, Zuverlässigkeit”
June 8, SMT/HYBRID/PACKAGING 2010, Nürnberg, Germany,
     “Reliability Issues with Lead-Free Soldering”



 


 

 

-----Original Message-----
From: Joyce Koo <[log in to unmask]>
To: [log in to unmask]
Sent: Mon, Mar 1, 2010 6:09 pm
Subject: Re: [TN] BTC rework, Square SJs


Warner, 
What is the max collapse allowable of ball from its height? 
--------------------------
Sent using BlackBerry


----- Original Message -----
From: TechNet <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Sent: Mon Mar 01 13:56:14 2010
Subject: Re: [TN] BTC rework, Square SJs


 Hi Chris,
The problem with this SJ is the low solder joint height 9=reduced reliability) 
and the stress concentration geometry from SMD.
Werner

 


 

 

-----Original Message-----
From: Chris Mahanna <[log in to unmask]>
To: Werner Engelmaier <[log in to unmask]>; [log in to unmask] <[log in to unmask]>
Sent: Mon, Mar 1, 2010 1:08 pm
Subject: RE: [TN] BTC rework, Square SJs



In cross section, the vertical sides of the joint are straight. I assume it has 
more/less retained the shape of the [trapezoidal?] stencil.
Chris
 

From: Werner Engelmaier[mailto:[log in to unmask]] 
Sent: Monday, March 01, 2010 12:52 PM
To: [log in to unmask]; Chris Mahanna
Subject: Re: [TN] BTC rework, Square SJs

 

Chris,
What do you mean by "squarejoints?"
Werner

 

 

-----Original Message-----
From: Chris Mahanna <[log in to unmask]>
To: [log in to unmask]
Sent: Mon, Mar 1, 2010 12:15 pm
Subject: [TN] BTC rework, Square SJs

Are square joints simply due to the small mass of the components, or is it 




possibly an indicator of insufficient heat?  We have no indication that any of 




the paste didn't flow.  Wetting looks good.  All evidence is from microsection.









Thanks,




Chris









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