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5th February 2013, 08:29 PM
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diyAudio Member
Join Date: Oct 2009
Location: Warsaw
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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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