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OPA2991: Absolute maximum rating of output pin

Part Number: OPA2991

Dear Specialists,

My customer is considering OPA2199 and has a question.

I would be grateful if you could advise.

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We'd like to confirm the absolute maximum rating of output pin.

It isn't described in the datasheet.

Could we recognize it as the same as the rating of the input pin.

(V-)-0.5V ~ (V +) + 0.5V

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I appreciate your great help in advance.

Best regards,

Shinichi

  • Hi Shinichi,

    figure 7-10 shows that there are diode clamps from the output to the supply rails as well. But without knowing more I would limit the over- and undervoltage to 0.3V, not 0.5V.

    Why are you asking? Are you planning to stress these ESD diode clamps by the external circuit? In this case I would add additional diode clamps. The BAV99 or BAT54 could be used, eventually in combination with a small current limiting resistor.

    Kai

  • Hi Shinichi-san,

    The output pin is typically not "driven" like an input pin which is why an abs max rating is not provided for the output. Typically the output is driving some sort of load. There are ESD diodes from the output pin to both supplies which must have the current limited to less than 10mA  (preferably less than 1mA) if the output pin is expected to be driven higher or lower than the supply pins. I would highly recommend adding some protection diodes, as Kai mentioned, to prevent the internal ESD diodes from turning on.

    Thank you,

    Tim Claycomb

  • Hi Tim and Kai,

    I understand the output pin doesn't have absolute maximum rating.

    I'll share this information with the customer.

    When they have an additional question, I consult you again.

    I appreciate your great help.

    Best regards,

    Shinichi  

  • Hi Shinichi-san,

    While there is no abs max rating provided in our datasheets, there are limits that will damage the device when exceeded. The limits were discussed above.

    Thank you,

    Tim Claycomb

  • Hi Tom,

    Thank you for your reply and additional explanation.

    Yes, I understand there isn't abusolute maximum rating about output pin but has a limitation.

    It's like having an absolute maximun rating.

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi