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May 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, 17 May 2010 10:06:17 -0400
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 Hi Lee,
What do you mean by 'acceptable?'
Since the 90/10 balls are picked so they would not melt in a eutectic SnPb profile to preserve a large stand-off to give you good reliability, a demarcation line is to be expected. After all, you are soldering to another metal, in this case 90Pb/10Sn.
Werner
 
 


 

 

-----Original Message-----
From: Lee Whiteman <[log in to unmask]>
To: [log in to unmask]
Sent: Mon, May 17, 2010 9:52 am
Subject: [TN] MORE 90 / 10 SOLDER BALL QUESTIONS


I just posted a photograph of a 90 Pb / 10 Sn BGA solder joint on the
IPC Photo Gallery, that was soldered with eutectic SnPb solder and an
eutectic SnPb solder thermal profile.

The BGA on the left hand side is "acceptable", but the BGA on the right
hand side shows a clear line of demarcation. My initial thoughts was to
check the thermal profile, to see if it got to a high enough
temperature.

Any thoughts and comments?

Thanks.

Lee Whiteman, PMP
Senior Member Engineering Staff
L-3 Communications East
Telephone: (856) 338-3508
FAX: (856) 338-2906
E-Mail: [log in to unmask]

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