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BUF634: How to read lot code?

Part Number: BUF634

Hi Guys, 

I have the Burr brown version of this part. I believe.  T.I. bought them out. You guys have this part branded in T.I now. I just wanted to know how to read these chips to get an idea of age. They all say BUF634T, then under it are different numbers. It seems to that I get mixed lot numbers. 

 I’m not sure how to upload pictures here.