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Old 10th April 2014, 11:07 PM   #1
laplace is offline laplace  Australia
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Default more fake eBay semis (OPA627=AD744)

Die pictures here.
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Old 10th April 2014, 11:47 PM   #2
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SW on the die - That's me! Pretty elaborate fake, amazing.
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Old 10th April 2014, 11:54 PM   #3
laplace is offline laplace  Australia
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What, you did the layout for the AD744?
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Old 11th April 2014, 12:04 AM   #4
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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.
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Old 11th April 2014, 12:07 AM   #5
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Must be strange seeing your own work repackaged in a counterfeit part.
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Old 11th April 2014, 01:52 PM   #6
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What, you did the layout for the AD744?
No, and I don't remember why the layout guy didn't add his/hers.
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Old 11th April 2014, 01:56 PM   #7
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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.
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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Old 11th April 2014, 05:53 PM   #8
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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
Click the image to open in full size.

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.
Click the image to open in full size.
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Old 11th April 2014, 08:23 PM   #9
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Correct me if I am wrong Scott but for everyone else. These are the laser trimmed resistors.

Right
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Old 21st April 2014, 06:56 PM   #10
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Follow up, That's not an OPA627 but a cheaper BB/TI part rebranded. I guess a case of double fakes.
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