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TL431: TL431BIDBZR Noise issue or worst noise obtained on the output for parts TL341 marking with T3FU

Part Number: TL431

Hello,

We are experiencing noise issue with the voltage reference TL431BIDBZR specifically with marking parts T3FU. So I would like to know what are the main functionnal differences between parts marking T3FU and all other markings:  T3F3, T3FG and T3FS. So far, we tested marking T3F3 and T3FG without finding any noise problem. See below FFT done on voltage measurement:

We also got the bough parts information found in problem:

Here is below the circuit in question:

Note that the current drawn on the +8VA is very small 300-500uA and operating BW is  30Hz to 5KHz

Thank you for your help

Best Regards

Bruno