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LM6142: input protection diode

Cedrick
Expert 8270 points
Part Number: LM6142

Hi,

Good day.

Our customer is using the LM6142 and they have a question about it. Kindly find below the inquiry.

"I have a use case for the LM6142AIM/NOPB op amp, DC input common mode voltage may exceed the absolute max of the part according to the datasheet.  The max listed is VCC+0.3V.  The device is powered with +3.3VDC, and I may experience inputs of up to +3.7VDC at low currents (~20uA).  
The datasheet lists that the LM6142 has "limited built in ESD protection."  What exactly does that mean?  Will the ESD protection diodes for this device be able to sink 20uA of input current above the supply voltage safely?"

Thank you for your support on this matter .


Regards,

Cedrick

  • 0
    Guru 140200 points

    Hi Cedrick,

    limited ESD protection means that the chip is protected for the usual handling and assembling procedures but not for the 8kV ESD events in real life applications.

    As the absolute maximum ratings specify, limiting the input current below 10mA will allow the chip to survive your overvoltage conditions:-)

    Kai

  • 0 in reply to kai klaas69
    TI__Genius 17567 points

    Hi Cedrick, 

    To echo Kai's comments, it is never recommended to exceed absolute maximum ratings. The part is likely damaged in this endeavor, please adjust your system to be within the recommend operating range and try with a new IC. 

    All the best,
    Carolina