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AD676: what is the difference between two ICs?

Hi! I bought two AD676. The first one is supposed to be an original, it shipped from the US. But the second IC I bought on eBay from China, it costs more than three times cheaper. I haven't tested it yet since I would like to explore the difference before. First of all, is it possible that a cheaper IC is a fake? And I wondered to know the manufacturing dates for both ICs. 



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[edited by: Uladzislau at 9:30 AM (GMT 0) on 8 Apr 2019]