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SN65HVD3082E: RS485 transceiver SN65HVD3082E

Alexander Honold
Prodigy 10 points

Part Number: SN65HVD3082E
Other Parts Discussed in Thread: THVD1400

I have question regarding the RS485 transceiver SN65HVD3082E:

 

Unfortunately in one of our PCBA’s we supply the SN65HVD3082E only with 3,3V ( although it is specified for 5V only). The board with transceiver is working well so far, we discovered the mistake by chance.

  • How critical do you consider this design error?
  • Is there a high possibility that problems will appear?
  • What can go wrong?

 

Thanks for your help in advance.

 

Regards, Alexander

  • 0
    TI__Mastermind 25162 points

    Hi Alexander,

    Ultimately, the answer is no. You truly shouldn't operate at 5V transceiver at 3.3V because we have zero validation for that scenario. It could wear faster, not comply with RS-485 standards, and cause communication issues in heavily loaded networks. 

    However, the SN65HVD3082E is a common transceiver where we have multiple pin-to-pin replacement options for that accept 3.3V. I would look into the THVD1400. Overall, this is a newer transceiver with improved driver performance, built-in IEC ESD protection, and while being a little cheaper. Just select the same package, and you should be able to drop the THVD1400 with the same or better performance. At the bottom of the device product page where it lists the exact orderable part numbers, there is a button if you scroll to the right where you can order free samples to test it out.  

    Best,

    Ethan