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MAX3223E: MAX13223E replacement

Tiger Yeh
Expert 5095 points
Part Number: MAX3223E
Other Parts Discussed in Thread: TVS1401

Hi,

My customer want to have RS232 transceiver with supporting Vrx > 36V, currently MAX13223E could support this requirement. 

May I know whether TI have similar part?

According to TI cross reference tool, it said MAX3223E, but I saw it is up to 25V only.

Thanks and Best regards,

Tiger

  • 0
    Guru 296660 points

    The RS-232 specifications limits valid bus voltages to ±15 V, and requires transceivers to tolerate up to ±25 V. If you need to handle higher fault voltages, then you have to add external protection (e.g., TVS diodes like the TVS1401) to clamp to somewhere between 15 V and 25 V.

  • +1
    TI__Mastermind 48277 points

    Hi Tiger,

    Yeah we don't have anything that will meet that need - as Clemens indicated we max out at +/-25V so there would have to be protection that clamps between 15V and 25V.

    Depending on how long the fault conditions last (RS-232 valid input logic levels are -3V to -15V and 3V to 15V - so above that and it really isn't considered valid) a clamping diode may be the cheaper option to achieve what they need -as the competition part you list is expensive (extremely expensive for an RS-232 transceiver). Based on the listed pricing breaks for both our device + diode compared to comp device alone our solution is about 3.5 to 4 times cheaper - obviously if it will work depends on the exact fault case scenario so our solution has more variables in the design. 


    So essentially the more cost effective solution, depending on fault scenario as the fault requirements may make diode protection insufficient, is using a TI RS-232 device + protection - but from a design point of view comp may be easier because it has a high stand-off voltage (+/-70V) - but customer is paying a large premium for that feature and also makes me think it's one of the only 232 transceiver's on the market that has that protection because the premium is very large. 

    Please let me know if you have any other questions and I  will see what I can do!

    Best,

    Parker Dodson