XTR300: Device replace: XTR303,XTR404,OP101,OP202,OP707

Hi Yangbo,

looks like being parts from "Burr-Brown". Do you have a schematic to find out the specise part numbers? Example: Is it really "OP101" or more "OPA101"?

Kai

Hi Kai,

I don't have the schematic.

Regards!
Yangbo

Hi Yangbo,

I checked databooks back to 1979, and forward, and no devices having the numbers you have listed appear in them. Burr-Brown and TI and have always marked the full OPA designation, not OP, on the op amps unless the package is too small to accommodate the full model number. In those cases the the devices are marked with a 3-digit alpha-numeric code. There was an OPA101 and an OPA202, but not an OP101 or OP202. The OP707, XTR03 and XTR404 aren't close to any Burr-Brown product numbers,

Burr-Brown didn't start offering SOIC packaged devices until sometime in the mid to late 80s. Therefore, if these devices came from Burr-Brown they would have had to been produced after that time. I suspect the leading number "1" in the date codes may indicate 1991, but probably not 2001 or 2011.

Burr-Brown did produce some custom products, and they would be marked as the customer had designated so something could be marked as XTR303M if that is what the customer wanted. We have no records of any of the Burr-Brown custom devices; therefore, we can't determine what they are if they are custom products.

One remote possibility for determining their origin is to have the devices removed from the circuit board and sent to a semiconductor de-processing lab. The plastic packages could be jet-etched open until the die inside is revealed. The Burr-Brown die had identifying die codes on the die surface. If images of the die and markings can be produced we might be able to align them with product models.

Regards, Thomas
Precision Amplifiers Applications Engineering

Hi Yangbo,

it's a bit astonishing that there is something on each chip marking which is very similar for all the chips, like a consecutive number: "1705", "1709", "1710", "1723" ans "1725". Well, I think these chips could either be special custom products, as already mentioned by Thomas, or these chips could have been relabeled in order to mask their true identities.

Kai

Hi Kai,

We noticed that too!

Can you contact me at my email address:

kuehl_tom@ti.com

You are doing a job assisting with the inquiries!

Thanks, Thomas
Precision Amplifiers Applications Engineering

Hi Thomas,

Thank you very much. I will let customer know. They are designing a dust detector. I have suggested customer to use LMP7721.

Regards!

Yangbo

Hi Kai,

Well noted. Thanks a lot!

Yangbo