Unfortunately, it's not so simple to judge by appearance. TI acquired BB in 2000, almost 20 years ago. TI uses a number of internal and subcon factories to do assembly and test of products -- putting the silicon die into the package that you handle and then testing performance. For a given package, in this case a PDIP, each factory is likely to have different tooling, so the fine details of the package (all within the JEDEC POD <package outline drawing> for that package time) will vary, and that includes the slight differences in package shape as well as the identifying markings on the package. Thus the fact that your suspect OPA2134 looks physically similar to a TL072 is not of itself cause for concern. Assembly/test operations can get moved from one factory to another for any of various logistical and financial reasons; it's not uncommon. Thus a unit purchased in 2018 may have differences that you noted and still be a genuine article.
That said, I don't think TI has dropped the BB logo on parts that originally had it. Thus you are correct to be suspicious, especially given performance that may not be up to par. I would suggest contacting your 'reputable' supplier and tell them your concerns and ask them to investigate the authenticity of what they shipped you and/or provide you with replacements of known provenance. You can also contact TI via their "E2E" site and report your suspicions. Counterfeit semiconductor devices is a worldwide problem and the larger companies like TI take very seriously the tracking down of counterfeits.
The only way to definitively know about your units is to dissolve the plastic down to the die and see if the die is genuine. The requires chemicals you probably don't want to have at home and pretty much renders your part useless. Actually, not necessarily definitive as there is some clandestine business in taking wafer skeletons (bad die remaining after the good die are picked from a wafer) and packaging the bad die into counterfeit parts. That's not as common, but does happen.
That said, I don't think TI has dropped the BB logo on parts that originally had it. Thus you are correct to be suspicious, especially given performance that may not be up to par. I would suggest contacting your 'reputable' supplier and tell them your concerns and ask them to investigate the authenticity of what they shipped you and/or provide you with replacements of known provenance. You can also contact TI via their "E2E" site and report your suspicions. Counterfeit semiconductor devices is a worldwide problem and the larger companies like TI take very seriously the tracking down of counterfeits.
The only way to definitively know about your units is to dissolve the plastic down to the die and see if the die is genuine. The requires chemicals you probably don't want to have at home and pretty much renders your part useless. Actually, not necessarily definitive as there is some clandestine business in taking wafer skeletons (bad die remaining after the good die are picked from a wafer) and packaging the bad die into counterfeit parts. That's not as common, but does happen.
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