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Question about authenticity AD8620
Question about authenticity AD8620
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Old 5th February 2013, 08:29 PM   #1
ace99 is offline ace99  Yugoslavia
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Join Date: Oct 2009
Location: Warsaw
Default Question about authenticity AD8620

I bought a 2 weeks ago form utsource AD8620. The first time i bought j554/2955 toshiba transistors from them witch was 100% fakes. This time I have similar problem. Operational amplifier looks different than sample what I got a few years ago. In tipical application dc offset in original AD8620 what I got is 0-1mV but in this what I ordered form utsource is ... 12-28mV depends on channel. Maybe the ad8620 what I got form them is form old stock I dont know. When I send them the picture with my question about authenticity of AD8620... I got a reply form them - "They are the same parts, you can put on board to use it". So its risky to use it because of high dc offset.
Could somebody tell me that AD8620 on the picture are fakes or not? There is a original sample form local distirbutor on the right at the picture.
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Old 9th July 2015, 10:47 AM   #2
estudent is offline estudent  India
diyAudio Member
Join Date: Aug 2012
I had a similiar issue with a friend of mine. An ultra low offset & bias current opamp, do not remember the part no., had an offset of around -14 to -18mV on all the ones he ordered 25 of them. It used to be 0.0mV as he did not have any better resolution meter. After struggling for a fortnight, he ordered parts from Farnell and that fixed the problem. There is hardly any difference between the parts by the looks. Except that the marking on the UTsource parts would go away with paint thinner cleaning, whereas the ones from Farnell stayed. After my experience and reading yours, I have no more doubt that they are fakes.
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Old 10th July 2015, 01:58 PM   #3
ingo50 is online now ingo50  Germany
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Join Date: Aug 2012
Location: Berlin , GER


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