Scott, I think the claim is that these are actual AD744 die packaged by someone as an OPA627. Is that possible?
Which detail in those shots is a laser trimmed resistor, I'm clueless.
Which detail in those shots is a laser trimmed resistor, I'm clueless.
Yes, they could buy die. The big green things with tabs are trims you can see the laser cut in a couple. The 1 drawn in the upper left square is the grade "bin 1". Far more common are parts erased and rebranded.
EDIT - In reviewing the pics carefully I think the author is mistaken. The bond to the comp pin was there by evidence of the acid etch pattern. This is far more likely a simple erase and rebrand. BTW the offset trims on the two parts are to different supplies and totally incompatible.
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Correct me if I am wrong Scott but for everyone else. These are the laser trimmed resistors.
In the first image, they are surrounded in green boxes with the laser cut shown by the yellow arrow. The one surrounded by the blue box looks like two resistors only one of which is laser cut. Maybe the blue one is a resistor divider, laser cut to the right ratio. By the way I love the clown face in the upper right corner😀
In the other IC I have highlighted the laser cut resistor with a green box once again and highlighted the laser cuts with yellow arrows.
In the first image, they are surrounded in green boxes with the laser cut shown by the yellow arrow. The one surrounded by the blue box looks like two resistors only one of which is laser cut. Maybe the blue one is a resistor divider, laser cut to the right ratio. By the way I love the clown face in the upper right corner😀
In the other IC I have highlighted the laser cut resistor with a green box once again and highlighted the laser cuts with yellow arrows.
Follow up, That's not an OPA627 but a cheaper BB/TI part rebranded. I guess a case of double fakes.
really?? Next thing you tell us is that you can't even be sure that you get genuine parts if you order samples directly from the mfg... 😀
Wow.. Faked the fakers.. lol The problem with counterfeit ICs and capacitors is why I don't buy any semiconductors and electrolytic capacitors on eBay, or indeed anywhere except the authorized distributors. The few legitimate offshore sellers generally are not cheaper than local suppliers which is further disincentive although I am not sure I can identify the honest semiconductor sellers on eBay in any case.
There are honest sellers from china on ebay and I got lots of genuine ICs, transistors, and capacitors, but many times you have to know how the real part looks like and carefully see the ad pictures. If pics are blurred even lightly, or small, stay away. Seller's feedback reputation also speaks for itself.
There's also an axiom that says that you get what you pay for.
There's also an axiom that says that you get what you pay for.
In the pic you posted of the chip prior to break it open anyone can clearly see that it was erased and re labeled, thus fake.
What was the point in continuining with the endeavour?
What was the point in continuining with the endeavour?
Huh? Where is it obvious that either of the packages is re-marked? It certainly wasn't obvious to me that either the SOIC8 or the TO99 was re-marked, and not to the writer of the web page, either. Until Scott posted the pic of the OPA627 die, it wouldn't have been obvious to most people even looking at the die picture of the TO99 opamp - it is an authentic Burr-Brown Opamp, only not an OPA627.
Likewise, the SOIC8 device is most probably a real AD744, maybe originally packaged in a SOIC8 package, and re-marked as an OPA627.
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With a little bit of experience you will get to identify at a glance a fake marking.
Check out the upper surface of the chip. It looks like it's been ground down and a new label was stamped on it. Compare visually the upper surface wih the soft, much dark black surface of the sides.
This re marking procedure is common to almost all fake ICs and transistors.
As I understand, the TO99 in the OP picture is a genuine item.
Perfect summary, I got that picture from our ADA4627 designer after asking him, "how can that be an OPA627 the FET's are too small ?" This situation has become pretty sad for those folks that can't easily afford these inflated prices.
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Cool. very interesting. maybe someday i will try to open one. What kind of microscope do you use? I guess it very expensive. your website make me shocked ! what kind of job you are working now? I never see like this before. Interesting. Thanks for sharing
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