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The marking in the bottom is an optional marking from manufacturers. However, I cannot give much info without knowing whether or not these were purchased from TI website.
I cannot verify whether or not something is counterfeit, however our counterfeit team and customer support center can help!
High quality pictures of the bottom & top of the device(s)
High quality pictures of the 2D bar code labels.
Copies/pictures of shipping documents, i.e. packing slip showing the origin of the devices to TI. (If this information cannot be provided we are unable to provide verification due to uncertainties regarding chain of custody of the products.)
Provide device application.
Also note:
Semiconductor products purchased outside of TI’s authorized distribution network, including through brokers, independent distributors, or online marketplaces (sometimes referred to as the “gray market”), may be counterfeit, modified, beyond TI’s recommended shelf life, or improperly stored or handled. Accordingly, TI does not provide warranty coverage or customer support for semiconductor products purchased outside of TI’s authorized distribution network.
