Hi Julie,
Is this a single failure or have there been several with the same general signature?
If there have been several, has the pathway been the same?
What is the ESD rating of the device?


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Thursday, October 08, 2015 12:32 PM
To: [log in to unmask]
Subject: Re: [TN] Ropy grunge in IC

I respectfully disagree. If you look closely, it appears that some sections of the rope-like material are actually intertwined and run under the traces inside the die. It appears that the contaminant was there when the die was made. But on the other hand some of the same stuff is seen around the edges of the die as well. It is hard to tell.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Wayne Thayer
Sent: Thursday, October 08, 2015 11:47 AM
To: [log in to unmask]
Subject: Re: [TN] Ropy grunge in IC

That LOOKS like just a poorly cleaned decapsulation job. The stuff you're asking about could either be from the overmold material or some deteriorating seals in the decapsulator. So my instinct is that it's a "red herring" in your failure analysis. This contaminant appears to be EXTREMELY thin, no more than
5 microns, because there doesn't seem to be a detectable difference in focus height between this and adjacent circuitry (unless the image is actually a composite of several different pictures at different focus heights).

Wayne Thayer

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Thursday, October 08, 2015 12:31 PM
To: [log in to unmask]
Subject: Re: [TN] Ropy grunge in IC

Hi Julie,

Have your photo up, it's here:

http://stevezeva.homestead.com/3CK_2nd_decap_-_multiview.jpg

Steve

On Thu, Oct 8, 2015 at 10:21 AM, Julie Silk <[log in to unmask]> wrote:

> We had an intermittent failure on a part and after decap, there was a 
> rope-like line that seemed to weave in and out of the circuitry.  I'm 
> having Steve Gregory post a picture.  I'd like your thoughts on what 
> is going on.  We're consulting with the supplier, but I'd like your input.
>

-- 


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