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LMH6618 Internal ESD Diodes on Inputs (Inverting & Non Inverting) - Forward Voltage Typical or Tolerance

Other Parts Discussed in Thread: LMH6642, LMH6618

I would like to know the typical, min & max forward voltages for the internal ESD diodes on the inverting and non-inverting input pins.

Kind Regards,

Marc

  • Hi Marc,

    For the internal ESD diodes of the LMH6618 information you requested, I assume that you need this data to make sure the "Absolute Maximum Ratings" is not violated. This information is somehow missing from the LMH6618. This is how similar other devices (LMH6642) show this data, which would be applicable to the LMH6618 as well:

    LMH6642 Absolute Maximum Ratings (+/- 0.8V from V+ and V- applicable to the LMH6618 as well):

    Regards,

    Hooman

  • Hi Hooman,
    The customer actually wants to know because he intends to place a BAV199 low leakage diode from GND to the inverting input. I reason he wants this so he can rely on the external diode clamping a transient. This is why he wants to know the tolerance on the internal ESD diodes.
    Please let me know.
    Marc
  • Hi Marc1,
    I don't think the information you are asking about (the variation of the forward voltage of the internal ESD diodes) is available to me. However, I've forwarded your question to some colleagues and if they can provide guidance, I'll post the response for you.

    If your objective is to clamp the input(s) using external diodes, I'd think that you are better off using a fast Schottky diode which would have a much lower forward voltage drop compared to a PN junction.

    Regards,
    Hooman
  • Hi Hooman,
    Any updates from your other colleagues?
    -Marc
  • Hi Marc,
    On the internal ESD diodes, unfortunately there is no additional information available to my colleagues either. The only comment I got from them is that the diodes will have the nominal -2.5mV/ deg. C temperature coefficient on their On voltage, if you were concerned on how their On voltage varied over temperature.

    Sorry about not having more information to provide.

    Regards,
    Hooman
  • Hi Hooman,

    OK.  Thank you for following up.

    -Marc