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December 2009

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Subject:
Re: Solder Joint Fracture
From:
Werner Engelmaier <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Werner Engelmaier <[log in to unmask]>
Date:
Fri, 18 Dec 2009 13:29:48 -0500
Content-Type:
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text/plain (167 lines) 
 Hi Victor,
The article's title is: 'Failure Definition—Not As Easy As It Sounds" and directly relates to the issue of a partial crack in a gull-wing-type lead solder joint.
I also have attached a column on failure detection. I guess it is time ti write a column on these 'HA/HA's [HALT, HASS, etc.], and when they can and cannot do.
Werner

 

 

-----Original Message-----
From: [log in to unmask]
To: [log in to unmask]
Cc: [log in to unmask]
Sent: Fri, Dec 18, 2009 1:11 pm
Subject: RE: [TN] Solder Joint Fracture



Werner,
 
   What is the article name/search criteria?
 
Victor,
 

From: Werner Engelmaier[mailto:[log in to unmask]] 
Sent: Friday, December 18, 2009 10:44 AM
To: [log in to unmask]; Hernandez, Victor G
Subject: Re: [TN] Solder Joint Fracture

 

Hi Victor,
This is one of the problems with HALT—it is so severe and unconnected to realuse conditions, that you can get failure indications that are not pertinent tothe reliability of your product. You really should have used IPC-9701.
Now you do not know whether or not you have a problem. In terms of partialcracks and failure definition, you may want to ookl at my column in the Januaryissue of Global SMT & Packaging.

Werner

 

 

-----Original Message-----
From: Victor Hernandez <[log in to unmask]>
To: [log in to unmask]
Sent: Fri, Dec 18, 2009 10:45 am
Subject: [TN] Solder Joint Fracture

Fellow TechNetters:









   What is IPC position on a solder joint fracture on a gull wing




connection.   What percentage of fracture on the IMC region and/or bulk




solder is permissible?    Post Reliability, HALT.









Victor,









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