Identifying a 'FS45' SOT23 device

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  • Nevillet
    Badcaps Veteran
    • Sep 2019
    • 272
    • United Kingdom

    #1

    Identifying a 'FS45' SOT23 device

    Hi All,

    I'm trying to repair a PCB that has some surface mount SOT23 devices that apear to be transistors but testing them on the board are giving confusing results.

    Its named FS45 but I can't find a datasheet that seems correct.

    The device is used in 10 places on the PCB. In 4 cases they appear to be controling triacs and the attached picture it shows it connected to a BT136 triac with the FS45 connected to the gate leg of the BT136.

    Can anyone identify the device and suggest an alternative?

    Many thanks.

    PS: I have a newer version of the board where the SOT23 devices are used in the same positions as the first board discribed but are different but equally hard to identify.
    I've attached 4 example pictures.
    Last edited by Nevillet; 06-19-2024, 12:07 PM.
  • harp
    Badcaps Veteran
    • Jun 2022
    • 596
    • Planet Earth

    #2
    2SA1037
    PNP general purpose transistor
    Attached Files
    Last edited by harp; 06-19-2024, 12:48 PM.

    Comment

    • Nevillet
      Badcaps Veteran
      • Sep 2019
      • 272
      • United Kingdom

      #3
      That's great. Many thanks for your help.

      Comment

      • lotas
        Badcaps Legend
        • Jan 2016
        • 4526
        • Russia

        #4
        Or maybe 2SA1576A.
        https://kpcomponents.co/products/2sa...nsistor-a1576a
        Attached Files
        Last edited by lotas; 06-19-2024, 02:48 PM.

        Comment

        • truclacicr
          Badcaps Veteran
          • Apr 2019
          • 297
          • australia

          #5
          Too many candidates:

          http://markingcodes.com/search/c/ts
          http://markingcodes.com/search/c/fs

          https://pl.aliexpress.com/item/1005004756587472.html (photo of 2SA1037)

          Last edited by truclacicr; 06-20-2024, 01:24 PM.

          Comment

          • R_J
            Badcaps Legend
            • Jun 2012
            • 9535
            • Canada

            #6
            What is this board out of? is it a power supply board? if it is maybe if we had a make and model number we could help.

            Comment

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