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Unknown transistors , 5 pin???

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  • Unknown transistors , 5 pin???

    Hi

    This is my first thread, so i hope it isnt in the wrong category.
    A friend of mine brought in a Proel Next 15 A active speaker. On power on the protect light doesnt turn off- it stays in protect mode.
    There are two output transistors for the LF part, and appear to be short-ciurcited/burnt. I measured a short between 2 pins.
    The thing is i cant find any info on what type transistors they are. The markings on them are SAP16 PO 3725 and SAP16 NO 3718.

    Here are the pictures of the transistors/ICs.


    Click image for larger version

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    Click image for larger version

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    Any help will be greatly appreciated

  • #2
    they are Sanken Electric Darlingtons I believe
    SAP16* datasheet & application note - Datasheet Archive

    here is another tale of woe
    Help Troubleshooting a blown amp (SAP16) - diyAudio

    replacements are about $5 each from DK
    http://www.digikey.com/product-searc...376376?k=STD03

    Comment


    • #3
      Better to replace those with STD03N/P. Add external emitter resistors. Much more reliable than lousy old SAP's.

      Comment


      • #4
        Google SAP16N & SAP16P.
        You will find the datasheets.

        Comment


        • #5
          Looks like the SAP16N was obsoleted 5/31/2007 try STD03N from Sanken as well - available at Digikey. Please check the pinout and specs.

          Comment


          • #6
            Being aware that a ballast resistor (which was internal to the SAP16) must now be added to the circuit.

            Comment

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