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fake opa627's in the wild.

Apr 15, 2008 at 1:04 PM Thread Starter Post #1 of 184
adamus

adamus

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All,

I recently purchased some opa627's (bp) that didnt work as specified. I contacted Texas Instruments who have since confirmed they are counterfiet.

I am waiting from a reply from the supplier before i release details, but its somewhere that has been suggested here as a good cheap source for opa627's.

Warning - if they seem too cheap they probably are.

Lesson learned on my behalf!
 
Apr 15, 2008 at 2:26 PM Post #3 of 184
Quote:

Originally Posted by adamus /img/forum/go_quote.gif
All,

I recently purchased some opa627's (bp) that didnt work as specified. I contacted Texas Instruments who have since confirmed they are counterfiet.

I am waiting from a reply from the supplier before i release details, but its somewhere that has been suggested here as a good cheap source for opa627's.

Warning - if they seem too cheap they probably are.

Lesson learned on my behalf!


Wow - I was wondering what your/their results were. First, I'm glad you figured it out with TI's help. Second, I'm sorry if you lost money on them. Hopefully TI will make you a nice award for some real opamps - you deserve it!
 
Apr 15, 2008 at 3:46 PM Post #4 of 184
Yes, thanks for taking the time and effort to have these evaluated by TI! Sorry it turned out bad, but good to know if you save anyone else from a similar fate. Hopefully the seller will refund your money as well.
 
Apr 15, 2008 at 5:15 PM Post #5 of 184
I bought some OPA637's cheap on ebay, and they actually sounded very good to me, no doubt about it. I had assumed they were old engineering samples someone rescued from the trash or something.
 
Apr 15, 2008 at 5:28 PM Post #6 of 184
mine were not from ebay. I got them on a recommendation from this forum. Its more than likely the upplier is oblivious to them being fake.

Lets hope i get a refund.
 
Apr 15, 2008 at 6:10 PM Post #8 of 184
the number didnt tally to any of their production. The housing was unlike anything they make (no notch but with the bb logo).
 
Apr 15, 2008 at 7:18 PM Post #10 of 184
opa627lm3.jpg
 
Apr 15, 2008 at 11:05 PM Post #12 of 184
I would venture to guess that since Ti's qty1k wholesale price is currently advertised as $17.75 per each, that the $11 price point is extremely suspect.

When people resell engineering samples on ebay, 2 or 5 at a time, that's one thing, and the price can go anywhere. but someone stocking them and offering them at substantially less than wholesale? either stolen or fake.

($17.75 is for the opa627bp. the ap version is $12.25, but the pictured parts are BP, and $11 is still unlikely for a small retailer to sell the AP version either.)

(Further edit - especially considering that opa627 parts are out of stock with a lead time of at least 20 weeks, genuine production overstock lots from factories that bought at qty1k would thus be of accutely high value and would probably be sold at or above market value to other board manufacturers rather than dumped as surplus)
 
Apr 15, 2008 at 11:43 PM Post #14 of 184
OPA627BP are hard to find these days in my experience! If anyone is interested I bought a pair of OPA627BP from this listing on ebay for $37.98 shipped. They're supposedly from an estate sale. I haven't used them yet but they look legit with the dimple, correct ink colors and a correct looking lot code.
 
Apr 15, 2008 at 11:45 PM Post #15 of 184
Quote:

Originally Posted by CountChoculaBot /img/forum/go_quote.gif
Good pics of real OPA627BP's:
OPA627BP Photo: Enlarged


some of those look remarkably like the op's fakes.

They are also the only other pictures i've seen of opa627's with a corner dimple with vertical rather than rounded sides.

the "batch codes don't match" explanation, if you look around, is one we've seen before - and it's a good enough reason - but at least once it's been applied to a part that was purchased from Farnell, who is a licensed and reputable dealer.
 
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