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how much current from RS422 output.

Discussion in 'General Electronics Discussion' started by HellasTechn, Dec 24, 2019.

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  1. HellasTechn


    Apr 14, 2013
    Hello everyone and Merry christmas.

    I have this strange question. In the past i accidently shorted the rs422 output of a driver chip and it got damaged. can i avoid it by placing a fuse in serries ?
    how much current can a typical rs422 driver deliver before it gets damaged ?
    I try to figure out if i can protect an rs422 driver from being damaged due to short circuit with ground.

    Thanks alot !
  2. Nanren888


    Nov 8, 2015
    Not really an expert at RS422, but Google is a really helpful guy to have round.
    Says RS422 specifies an output current of 150mA

    The fault protected MAX14775 says it protects at 200mA.
    The MAXM22510 says it has an output short circuit current , min 30mA, max 250mA (@12 volts supply)

    Seems the popular answer on the hits I got was "buy our output protected devices". :(
    HellasTechn likes this.
  3. HellasTechn


    Apr 14, 2013
    Hmm that looks helpful. I thought it would be around 50ma. TI pdf's also state 150ma max driver short circuit to gnd current.

    What about rs232. Havent found anything yet.
    Last edited: Dec 24, 2019
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