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SN65HVD1782: 3.3V RS-485 Application

Jack Carnovale
Prodigy 10 points

Part Number: SN65HVD1782
Other Parts Discussed in Thread: TMDSDOCK28379D, THVD2450

I have a 3.3V RS-485 application where we are using through hole components to quickly protoype a design. The SN65HVD1782P is rated for 3.15 to 5.5V. Would I have an issue running it on 3.3V directly off a microcontroller? We are using a TMDSDOCK28379D kit.

  • 0
    TI__Mastermind 25142 points

    Hi Jack,

    If you have an adequate 3.3V supply, then yes, SN65HVD1782P will work just fine. I would just double check the current limit. RS-485 transceivers are not the most efficient and will need 100-200mA at peak conditions. But for simple testing 100mA should be fine. 

    However, I would point you to our newer line of RS-485 transceivers, specifically the THVD2450 (which is more efficient as well). This has an even higher bus fault protection, and many additional features, while being cheaper. 

    Best,

    Ethan