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LMV358 body diode question.

D. Johnson
Intellectual 700 points
Other Parts Discussed in Thread: LMV358

I have a customer that is trying to protect their LMV358 circuit from transient and fault conditions.

Does the LMV358 inputs have some type of protection diode to either rail ?

Assuming yes, what is the maximum current that these diodes can handle without damaging the device ?

Thanks

Dave Johnson

  • 0
    TI__Guru 61746 points

    Hi Dave,

    Yes. The LMV358, and most modern op-amps, have a diode from the input to each supply.


    The Absolute Maximum Ratings table will have either a maximum input voltage or current. In the case of the LMV358, it is a voltage (0.3V past rails).

    For the LMV series, 10mA is a safe value if the current not listed. Though you really want to keep the current to a minimum (<1mA).

    Note that these ESD devcies are not designed for continuous use, and should not be relied upon under "normal" operation. External clamping diodes should be used if the inputs are expected to have excursions above the rail as part of regular use.

    Adding external series resistance to limit the current is sufficient. A rule-of-thumb is to add 1kohm of series resistance for each volt over the rail. Feedback or divider resistors in the input path can count towards this resistance.

    Regards,