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

Bruno Simard67

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

over 2 years ago

0 Masoud Beheshti61 over 2 years ago

TI__Genius 16261 points

Hello Bruno,

These marking denote points of assembly and should have no bearing on the noise performance of the device. We also received your question through our field engineering team. Would it be ok we follow up directly through them?

0 Bruno Simard67 over 2 years ago in reply to Masoud Beheshti61

Prodigy 230 points

Hello Masoud,

Thank you for your fast reply.

That's fine with me to get an answer by any communication channel as long as I can get some feedback as soon as possible. Note that the production is on hold with part marked T3FU.

Best Regards

Bruno

0 Masoud Beheshti61 over 2 years ago in reply to Bruno Simard67

TI__Genius 16261 points

Hello Bruno,

We will do that . No issues. Thanks.

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