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Old 5th May 2005, 10:36 PM   #1
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Default Fake OPA627

I've just bought some OPA627APs from Farnell in the UK and I'm a bit suspicious of them. The BB logo isn't quite the same looking as it is on all of my other Texas/BB opamps and there is no registered trademark sign (R) after the logo. I've never seen this before, surely the (R) symbol will be on all genuine Burr Brown parts. The datestamp is 49ADON7 and is printed in slightly whiter ink than the logo.
In the past I've had OPA627APs where the logo, registered trademark symbol, and part number are printed on the package in light brown and the datestamp is printed in white. The light brown printing looks genuine enough but I'm worried about the use of different coloured inks.
I've emailed TI to see what they say but I wonder if any of you have come across fake OPA627s. Their cost must make them a prime target for counterfeiters?
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Old 5th May 2005, 10:44 PM   #2
tool49 is offline tool49  Canada
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Every time I buy some of those I'm a bit suspicious too (at $25 a pop you tend to be more suspicious you know) but I've had similar batches to the ones you just got. They seemed to have been manufactured in a different fab... But they test and sound just like my other OPA627... I sort of let the suspicion away about the (R) sign not being present after that. If they are copies, they sound just as good. And besides I doubt Digi-Key or Farnell would go into the trouble of acquiring fake parts.

Hope this does quelm a few of your suspicions.
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Old 5th May 2005, 11:59 PM   #3
Stocker is offline Stocker  United States
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Even highly reputable suppliers can get fooled into buying fake parts. I doubt if those mentioned would do it intentionally.
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Old 6th May 2005, 12:29 AM   #4
sss is offline sss  Israel
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opa627 comes in different types of packages , on every pack the typing is different
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Old 6th May 2005, 12:30 AM   #5
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You'd think for $25 they could at least get the printing right?
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Old 6th May 2005, 12:43 AM   #6
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These are all authentic parts from Digikey...
Attached Images
File Type: jpg bb.jpg (82.0 KB, 1093 views)
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Old 6th May 2005, 02:00 AM   #7
Leolabs is offline Leolabs  Malaysia
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I just got 4 OP37 samples from TI yesterday,1 of them has the "R" after the "BB",the others non.Dont tell me that TI sends fake samples too
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Old 6th May 2005, 04:12 AM   #8
BrianL is online now BrianL  United States
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There is a lot of variation these days as all the companies
change to new Pb-free/green materials at new assembly
sites, etc.

The "brown" marking is laser marking. I would guess that
the parts receive the generic laser marking when assembled.
Then when they are tested and graded out to high and low
grades, the white marking is done -- looks like a manufacturing lot
code is inked on. The lot code would be different for the
high and low grade units that came from the same raw
batch of parts. Thus it could not be put on before testing
and grading.
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Old 6th May 2005, 08:38 PM   #9
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Thanks for the responses everyone, particularly EchoWars with the photograph showing all three variations. That's certainly put my mind at rest. I've had a few fake transistors in the last couple of years so I guess I'm getting a bit paranoid ( but then didn't John Le Carre say "believe your paranoia" in one of the Smiley novels )
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Old 7th May 2005, 12:44 AM   #10
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Just to tweak your paranonia a little. A few weeks ago, walking past one of the hole in the wall component shops in Singapore, a curious liitle scene met my eye. Four people in a row, studiously, and silently, scrubbing the markings off rail after rail of ICs. They used ball point pen erasers, and the last guy in the row was carefully dusting the ICs with a brush.

Now I can't imagine any legitimate reason to remove all the markings from a device. One can only assume that the next step was to print new markings.
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