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TLV4062: IN(x) current way off chart

Part Number: TLV4062
Other Parts Discussed in Thread: TLC271,

current on IN1 measured  thru 1MΩ supply resistor is 1.12μA with VIN(x)+3.0V and 346nA with VIN(x)0V. Spec are mentioning 15nA

Have you got, sorry to ask, some products in the market off-spec?

 test done on pin 6 piloting a PNP on pin 2, circuit working but not at expected threshold.....of course .....with such IN(x) current

Have you got any feedback as mine? any suggestion for a replacement part (working at low in current meaning actual high entry impedance)?

with regards

Jacques RENAUD

 

NOTE: Product purchased last week at MOUSER.

  • I do not understand how you would a supply resistor to measure the input current. Please show the exact test circuit that you're using, including the measurement device and its input characteristics.

  • Adding on to Clemens's comment, have you tried this test on multiple parts? Are you seeing similar results with other parts? 

  • Thanks for the suggestion of trying on other part but No I did not, I like manufacturer to tel me if they have had QA problems or not as starting point.

    I am more careful now in comparator/opamp selection.

    e.g. I have tested circuit with TLC271 no Pb (input impedance 10power12 ohms)

    Then I am looking now for nano-power  low tension comparator/opamp without internal reference and checking the input impedance as per manufacturer spec.

    Have a nice day

  • TI guarantees the input current for certain test conditions. If you get a different current, then I can only assume that you are using a different test circuit.

  • Bonjour Jaques,

    can you show a schematic of your test circuit?

    Is the TLV4062 powered during the test?

    Kai

  • simpler does not exist

    Is the TLV4062 powered during the test?

    ah ah,....well tried, other question?

  • Are you real or your answers are tuned on purpose?????

    the schematic you asked for is here what is more straightforward than that?

  • Hi,

    I have found the problem.

    I analyzed it considering it was my doing.

    Since the schematic is simple I suspected the liaison PCB/pins.

    After unsoldering the TLV4062 I cleaned the PCB which was presenting remnant of flux under the chip and the chip itself.

    I re-solded the chip without flux...et voila ….the TLV4062 is working like a charm.

    Flux used MG Chemical 8342

    The first time it happens to me : I am wondering what should I do on the final board ????

    Change flux?

    Any one had this experience ?

  • Hi,

    I have found the problem.

    I analyzed it considering it was my doing.

    Since the schematic is simple I suspected the liaison PCB/pins.

    After unsoldering the TLV4062 I cleaned the PCB which was presenting remnant of flux under the chip and the chip itself.

    I re-solded the chip without flux...et voila ….the TLV4062 is working like a charm.

    Flux used MG Chemical 8342

    The first time it happens to me : I am wondering what should I do on the final board ????

    Change flux?

    Any one had this experience ?

  • Hi,

    I have found the problem.

    I analyzed it considering it was my doing.

    Since the schematic is simple I suspected the liaison PCB/pins.

    After unsoldering the TLV4062 I cleaned the PCB which was presenting remnant of flux under the chip and the chip itself.

    I re-solded the chip without flux...et voila ….the TLV4062 is working like a charm.

    Flux used MG Chemical 8342

    The first time it happens to me : I am wondering what should I do on the final board ????

    Change flux?

    Any one had this experience ?

  • A modern board assembling house has their own cleaning process, so this shouldn't be a problem when you go to production with your board.  I presume you are just having the problem with your hand soldering.  In our lab when we hand solder parts and simply clean the boards with alcohol and air blow them dry. But I feel your pain.  As the pitch of these parts gets smaller and smaller, hand soldering gets more complicated.  We are just fortunate to have an excellent technician :)

    Chuck