Smd code to part number

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  • esinior
    New Member
    • Nov 2022
    • 9
    • Iran

    #1

    Smd code to part number

    Hi i have a smd part with probably mark "QO 11" or "Q0(zero) 11" on it, and its package is SOT89, i doubt its KTB1260 PNP transistor, but in measuring with diode mode of multimeter it shows number 1.4 between emitter and collector pins and its not open circuit, and .59 from collector to base and .8 from emitter to base , and these numbers doesn't match a pnp transistor, i couldn't find any part number and datasheet for it, does anybody have information for that part number?
    I've attached pics of this part
    Thanks
  • Answer selected by esinior at 09-07-2024, 04:25 AM.
    lotas
    Badcaps Legend
    • Jan 2016
    • 4458
    • Russia

    https://monitor.net.ru/forum/threads/669255/
    https://www.digikey.com/en/products/detail/maxlinear-inc/SPX1431M1-L-TR/2472297
    Attached Files

    Comment

    • truclacicr
      Badcaps Veteran
      • Apr 2019
      • 289
      • australia

      #2
      It would help to see the part on a photo of the full PCB, or at least the surrounding area.

      Comment

      • esinior
        New Member
        • Nov 2022
        • 9
        • Iran

        #3
        Originally posted by truclacicr
        It would help to see the part on a photo of the full PCB, or at least the surrounding area.
        It's a component on the PFC (power factor correction) section of a SPS (switching power supply) and i think it could be a shunt regulator too, but it's named Q on the board, I send pics of board and daughter board

        Comment

        • lotas
          Badcaps Legend
          • Jan 2016
          • 4458
          • Russia

          #4
          SPX1431M1-L/TR (TL431)

          Comment

          • esinior
            New Member
            • Nov 2022
            • 9
            • Iran

            #5
            Originally posted by lotas
            SPX1431M1-L/TR (TL431)
            Thanks for your helpful reply, but its smd code due to datasheet is "N011" and my code is "Q011" probably, do u have any comment about it?

            Comment

            • sam_sam_sam
              Badcaps Legend
              • Jul 2011
              • 6018
              • USA

              #6
              I did a quick google search and found a part marking with “Q011” but unfortunately this device package has 5 pin but your device is a 4 pin so it not the same part

              Comment

              • lotas
                Badcaps Legend
                • Jan 2016
                • 4458
                • Russia

                #7
                https://monitor.net.ru/forum/threads/669255/
                https://www.digikey.com/en/products/detail/maxlinear-inc/SPX1431M1-L-TR/2472297
                Attached Files

                Comment

                • esinior
                  New Member
                  • Nov 2022
                  • 9
                  • Iran

                  #8
                  Thanks a lot, i think it's true number, I will test it, middle pin is connected to GND as expected

                  Comment

                  • esinior
                    New Member
                    • Nov 2022
                    • 9
                    • Iran

                    #9
                    Circuit workd with SPX1431
                    part is correct Thanks for your help

                    Comment

                    • lotas
                      Badcaps Legend
                      • Jan 2016
                      • 4458
                      • Russia

                      #10
                      Originally posted by esinior

                      Circuit workd with SPX1431
                      part is correct Thanks for your help
                      Ok!

                      Comment

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