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Original question:

TRS3232E-Q1: Can TRS3232E-Q1 protect short to 12V car battery and GND

TRS3232E-Q1: Short to 12V unclear

Ovidiu Fechete
Prodigy 70 points
Part Number: TRS3232E-Q1

So is the pin protected against 12V or not? If it is stated that the maximum allowable voltage is -6 +6, does that mean that the pin can withstand 12V if referenced to GND? And in an automotive design 12V is not enough because the range is wider. Actually the max voltage would be between 16V and 18V. So what about 18V? 

  • 0
    Guru 290050 points

    All absolute voltages are specified relative to GND. (RS-232 has no differential voltages.)

    If you want transceiver with higher fault tolerances, use RS-485 or CAN instead.

  • 0
    TI__Guru 60980 points

    Ovidiu,

    The cable side pins of the driver and receiver can withstand the limits stated within the absolute maximum values of this table found in the datasheet.

    This means that the driver pins on the cable side will not withstand 18V, as Clemen's pointed out you may need to move to an RS485 transceiver for higher fault protection instead.

    -Bobby