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RE: Are cheap Hong Kong sourced opamps real?

Posted by Steve McCormack (M) on February 17, 2009 at 18:41:05

In Reply to: Are cheap Hong Kong sourced opamps real? posted by Panelhead on February 16, 2009 at 17:57:21:

The OPA2107AP is my preferred dual opamp, so I am very curious about this question as well. I recently purchased a lot of 10 pieces from ebay seller "goodbuy711" with batch code "65ZETR5" and a mold mark on the back showing "Thailand 2FA." At the time I bought these I could not find any stock via US distribution, so I decided to take a chance with ebay. I first ran a search for comments on fake or counterfeit parts and could not find anything, so I went ahead. I have the parts but have not used any yet, so I can't comment on their performance - I'll have to get to that soon.

Now that you have raised the question again, I have asked Texas Instruments for help. We shall see what they have to say (if anything) and I will report back if I receive any useful information. Meanwhile, a somewhat deeper search did turn-up one fellow who is convinced that these OPA2107AP parts coming from Hong Kong ARE in fact fakes. There is no specific evidence cited, but he is of the opinion that they are re-labeled OPA2134s - not a bad part, but definitely not in the performance league of the 2107. I have included the link, FWIW.

Mouser has some stock now at $12.25 each for small quantity, so I have bought a few "real" parts for comparison. I don't know when I'll be able to get to it (sorry), but I'll try to post my findings here in the near future. If anyone else finds anything of substance, I would appreciate hearing about it here.


Best regards,

Steve McCormack, designer
SMc Audio

• http://www.head-fi.org/forums/f6/fake-opa627s-wild-316937/in   (Open in New Window)

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