I understand this as a possibility, but I am used to seeing the scratches
having what looks like shattered glass at the edge of the indentation. And
I've never seen the segmented kind of features. And usually you can see a
lot of differences in the focus plane.

But yes, I agree that the parentage of this part needs to be certified!

Wayn

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
Sent: Friday, October 09, 2015 2:45 PM
To: [log in to unmask]
Subject: Re: [TN] Ropy grunge in IC

yap, like P-doped glass passivation scratch to me. (zig zag no
crystallography fracture, so it is not die cracking... ;-).
jk
> I'm an old semiconductor reliability engineer (and this die looks like 
> it's old technology too :) ) - that looks like a scratch on the die. 
> So either it was untested by the manufacturer or it was scrap acquired 
> by dumpster diving (or some other nefarious method), packaged and sold 
> as a functional device...i.e. counterfeit.
>
> Mike
>


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