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LM124AQML-SP: safe condition or damage?

Adam Daluga
Expert 5920 points
Part Number: LM124AQML-SP
Other Parts Discussed in Thread: LM324, LM358

Hello,

 I was wondering ifapplying ~2.5V to the non-inverting input of the LM124AWGRQMLV while the device is unpowered is a safe condition or if this might cause damage.  Thanks for your help!

Best,

Adam

  • 0
    Guru 272490 points

    The absolute maximum ratings allow up to 32 V. See section 2.2 of the Application Design Guidelines for LM324 and LM358 Devices:

    Because the inputs have no internal diodes to VCC, the input voltage can exceed the VCC voltage. If this occurs, the input will block current flow due to a reverse biased diode forming in the input PNP transistor. Current flow is blocked even if VCC equals 0 V. If either input or both inputs exceed maximum the VCC rating, junction breakdown can occur. This may lead to permanent device damage per the table notes in the respective device's data sheet Absolute Maximum Ratings table.

  • 0 in reply to Clemens Ladisch
    TI__Mastermind 23200 points

    Thank you Clemens once again for helping! 

    Hi Adam,

    To also help with understanding different ESD protection structures, we have the Op Amp ESD Protection Structure application note. It goes into what could happen in scenarios where there's an input signal present but no supply voltages. Just an alternative piece of content if you'd like to learn more. 

    Best Regards,

    Robert Clifton