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INA214: Query for Abs value of INA214

Harry Ma
Intellectual 2040 points
Part Number: INA214

Hi Team

For INA214

  1. What is the lowest minus voltage that IN+\IN- can withstand（based on GND)? it's GND-0.3?
  2. Is the GND-0.3V stable value or instantaneous value？ if it's a instantaneous value, hong long of the time limitation？
  3. note （3）describes that if the current input into IN+\IN-  pin is smaller than 5mA，the voltage on  IN+\IN- can exceed the rang from GND-0.3V to 26. what's the minus limitation voltage under this conditions?
  4. if IN+\IN-  was damage because of the voltage is exceed -0.3V. the IN+\IN- will be open or short to PGND ？

  • 0
    Guru 281710 points

    There are clamping diodes from GND to the pins. If the current through such a diode exceeds 5 mA (for any amount of time), the device can be damaged.

    There are no guarantees about failure modes; a burnt-out diode is likely to have damaged nearby components.

  • 0
    TI__Expert 3990 points

    Hi Harry,

    Thanks for the question and using the E2E forum.

    Harry Ma said:
    What is the lowest minus voltage that IN+\IN- can withstand（based on GND)? it's GND-0.3?

    Yes, the absolute minimum voltage that can be applied to the INA214A is GND - 0.3V. The B and C versions can only go down to GND - 0.1V

    Harry Ma said:
    Is the GND-0.3V stable value or instantaneous value？ if it's a instantaneous value, hong long of the time limitation？

    This limit is a stable value and not limited to time.

    Harry Ma said:
    note （3）describes that if the current input into IN+\IN-  pin is smaller than 5mA，the voltage on  IN+\IN- can exceed the rang from GND-0.3V to 26. what's the minus limitation voltage under this conditions?

    There's not a limitation on the voltage as long as the current into the pin is limited <5mA.

    Harry Ma said:
    if IN+\IN-  was damage because of the voltage is exceed -0.3V. the IN+\IN- will be open or short to PGND ？

    Like Clemens states, there's not a defined state of failure if this pin were to get damaged and could fail either open or short.

    Please let us know if you have any further questions.

    Louis

  • 0 in reply to Louis L
    TI__Intellectual 2040 points

    Hi Louis

    Thanks for your support.

    For question 3: you said that there is no input voltage limitation as long as the current is limited< 5mA.  I am confused for this comment.

    The table limits input voltage rang is GND-0.3 to 26,  however you said that the voltage is no limitation of input voltage. How to understand it?

  • 0 in reply to Harry Ma
    Guru 281710 points

    The diodes clamp the voltage; for currents of less than 5 mA, their forward voltage is quite small.

    (If you use a series resistor to limit the current, then most of the voltage is dropped over the resistor, not over the diode.)

  • 0 in reply to Harry Ma
    TI__Expert 3990 points

    Harry,

    I agree with Clemens. If the current into the pin is limited to <5mA, the resister used to limit that current would actually see the voltage drop such that the pin doesn't get exposed.

    Louis