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REF3212: Voltage Ratings on Output Pins

Hayden_Hast
Intellectual 1515 points
Part Number: REF3212

Hello,

I would just like to confirm my understanding of a datasheet spec. I am using the REF3212 in an application that is expected to experience lightning strikes and want to make sure the REF3121 can handle the brief high voltage and current on the OUT_F and OUT_S pins. I've attached a screenshot of my circuit.

In the datasheet, there is no specific max rating on the OUT_F and OUT_S pins in the "Absolute Maximum Ratings" section so I'm assuming these pins can handle only +7.5 voltage maximums which is placed on the "Input Voltage". Also, what is the maximum current that the Vo pins can handle? 40mA per the Isc sinking spec?

REF3212_E2E.docx

Thanks,

Hayden

  • 0
    TI__Intellectual 1540 points

    Hi Hayden,

    We don't guarantee performance for any voltages forced into the output pins.

    That being said, I ran some tests and the parts appeared to have a maximum limit around 7.5V in the output. Any time I applied a voltage above around 9V the parts instantly stopped working and would not recover, but since I only tested 3 parts with quick voltage jumps I'd recommend staying below the 7.5V. 

    The REF32xx family sinks around 40mA when any voltage below the input is short circuited into the output. When the parts broke around 9V, they were sinking about 90mA. 

    Regards, Diego Lewis

  • 0 in reply to Diego Lewis
    TI__Intellectual 1515 points
    Diego,

    Thanks for going the extra mile here and getting some testing done in the lab. I understand that there is no guarantee, but do appreciate the data points.

    Regards,
    Hayden