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Failure on OPA2313

FaMa
Prodigy 90 points
Other Parts Discussed in Thread: OPA2313, XTR115, OPA313

Hi all,

I'm using op amp OPA2313 in my application and in first 500pz production I experienced 4 pcs of OPA2313 broken (short circuit on output to ground or short circuit on inverting input to ground). I've reviewed my project but I can't see violation to absolute maximum ratings or application parameters.

Can someone help me to understand if there is something wrong or something that I can do before to go on mass production?

Attached you can find a schematic extract (U6A is the op amp with prevalent failure) where V+ and Vref are respectively +5Vdc and +2.5Vdc derived from TI XTR115 IC and input on R9 is 0-5V from another OPA2313.

Thanks for help!

8080.Schematic_Extract.pdf

 

  • 0
    TI__Guru 62915 points

    Hello,

    Would you please share the entire schematic that includes the connections to the XTR115 as well as the connections for the "other OPA2313" that creates the 0-5V input for R9?  Are you making sure to use a floating input when testing this 2-wire system?  If your input source is referenced to the Loop-Supply GND then you'll create some undesirable effects that may be causing damage.  

  • 0 in reply to Collin Wells
    Prodigy 90 points

    Hello,

    thank you for your answer.

    Attached you can find extract of XTR115 connection and R9 input drive. All analog circuit are floating, connected to XTR115 with GND on XTR115-PIN3, V+ on XTR115-PIN8 and Vref on XTR115-PIN1.

    7840.XTR115_01.pdf

    1738.R9_Drive_01.pdf

  • 0 in reply to FaMa
    TI__Guru 62915 points

    Hello,

    Thank you for the additional information.  At this point we still do not see any reason for failures of the OPA313 devices.  Would it be possible to get the real full schematic from you?  If you're not comfortable with posting it on the forum we can start a private session and you can provide me the schematic in private from the rest of the community.  Perhaps with the full schematic we can determine the issue.