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LT1014 - ESD diodes?

Kenneth Aquino
Expert 1330 points

Other Parts Discussed in Thread: LT1014

Does anyone know if the LT1014 has ESD diodes on each of the op-amps input pins?  If so, how much current can enter these pins without damaging the op-amp.  We have an unfortunate design where the inputs of the op-amp go off-board and there could be a case where the board that the op-amps are on is unpowered but the equipment driving the op-amp is on.  There are no current limiting resistors in series with the LT1014's input pins on this board.

  • 0
    TI__Guru**** 174176 points

    Kenneth,

    There are no ESD structures on LT1014. There are parasitic diodes. One from IN to VCC+, this conducts when IN>VCC+.

    The other is IN to VCC-, but it is after the 400 ohm internal resistor. It conducts when IN < VCC- but includes 400 ohms series resistance.

    When VCC+ = VCC- = 0V, the inputs can be in the range up to +0.5V to -5V.

    The general op amp rule is up to 10mA of input current is safe.

    The current to cause damage should be significantly higher.

    Regards,
    Ron MIchallick

     

  • 0 in reply to Ron Michallick
    Expert 1330 points

    Ron,

    Thanks for that information. I searched all over the internet for information like this but to no avail.

    Ken