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How To identify genuine or fake AD8066 opamp ?

Question asked by KennyX on Mar 20, 2017
Latest reply on May 16, 2017 by seriousam

Recently I bought 20pcs of AD8066ARZ from a chinese supplier, 10 of them of have low resistance issue between pin 6 and pin 4 , the rest of them either having high offset voltage or perform poorly. 

When I compare it with the a old unit which I bought from rs component, I do realize a little different which the rs unit have embossed dot on the opamp while the chinese supplied unit have a white color dot marking instead. chinese seller told me that this ic is produced by Analog device Taiwan and may have a different appearance.

I would like to know are there many different type of AD8066 package's design or did I actually bought counterfeit instead ?