TLV171: TLV171QDBVRQ1

Tool/software:

Dear Technical Support,

Good day!

Please verify for TLV171QDBVRQ1 and provide guidance for proper operation.
Or confirm if can be considered as defective ?

     
      The customer has advised:
      //
      As discussed on the chat today I want to start a Failure Assessment for a
      TI Op Amp
      that was purchased from Mouser by the Brisbane manufacturer Circuit
      Solutions. Theo Mitrakis the Engineering Director of Circuit Solutions is
      CC'd in this conversation.
     
      This chip is used in a commercial product that is in early stage
      production. Several chips have failed on several PCBs, sometimes the
      replacement part also failed and was replaced.
     
      The function of the opamp in the circuit is a simple unity gain buffer for
      an ADC input with bipolar supply of +/-9V.
      The failure observed is that the non-inverting input is drawing current
      loading up the approx 1.5V signal from the previous peak hold stage. See
      attached schematic.
      We understand that the TLV171 is superseded by the TLV9351. However we are
      not convinced that simply replacing the opamp with a newer model is going
      to resolve the issue unless we can understand the root cause of the
      problem.
     
      Attachments:
     
      Mouser invoice for latest purchase of this partSchematic of the relevant
      section of the product U15 is the Op Amp in question.image of chip in situ
      on PCB and desolderd part. Top markings are 1CJT. The underside is
      unremarkable.
      Please forward this information to the relevant Team at Ti for an
      assesment.
     
      In addition to the email below, I realised that the schematic snippet
      shows U15 already updated to the newer part TLV9351. This is to clarify
      that the failures happened with the TLV171 in current production boards.
      //
     

     

Customer Information:
               P3A STAR PTY LTD
               PO BOX 969
               REDCLIFFE, QLD 
               AUSTRALIA
               614 072 1664


     
Regards,
Manuel