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LT1013 ESD internal diode

Jib Jaja
Prodigy 125 points

Other Parts Discussed in Thread: LT1013

Hi TI people,

Regarding LT1013 datasheet and more precisely op amp schematics within page 3, could you tell me if there are ESD internal diodes not indicated between output, IN-, IN+ and power supplies of op-amp  ? If so, could you tell me how they are connected and how current they are able to carry please ?

Thx

 

  • 0
    TI__Guru**** 174676 points
    Jib,

    The absolute maximum ratings table is a great place to find the answers.
    The maximum differential input is 30V, therefore there are no diodes between the inputs.
    The lowest input voltage is [VCC-] - 5V because there is a diode plus 400 ohm to VCC-. (about 10mA max)
    The highest input voltage is VCC+ so there likely is a diode from input to VCC+. (keep current less than 10mA)
  • 0
    Prodigy 125 points

    Thank you for your answer.

    Indeed, I was refering to schematics versus absolute maximum ratings.

    An interesting information that I would like to check is why 10mA max ? There is no mention to maximum current allowed.

    In fact, is it acceptable to overstress op-amp beyond maximum voltages indicated in the datasheet but with a acceptable current less than 10mA ?

    BR,

     

  • 0 in reply to Jib Jaja
    TI__Guru**** 174676 points
    Jib,

    10mA is just a nice round easy to remember number. This current is considered safe for older junction isolated device like LT1013. Therefore no device damage will occur however the input current can cause unexpected results such as output inversion. This is why values like 0.3V beyond the rails are specified in the data sheet. This keeps the diode from conducting and ensures normal operation.