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Failed to identify SMD component with markings 81 and 947 and package SOT-89

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    Failed to identify SMD component with markings 81 and 947 and package SOT-89

    Hello,

    I can't identify a component labeled Q1 on the main board of a redundant server PSU from Etasis, product name EFRP-465

    ICs on the board have labels with prefixes U, so we have U1, U2, etc. The mysterious component is labeled Q1, so it must be a transistor (BJT)/MOSFET/etc.

    I have attached the image for Q1.
    I have searched multiple SMD reference websites without being able to identify the component.

    Here is some important information from the board::
    1. Pin 2 and the tab are connected to GND (after unsoldering Q1, I confirmed they're the same pin).
    2. Pin 3 is fed from the aux of a flyback transformer, via a Schottky diode (the other transformer aux pin is connected to GND).
    3. Pin 1 feeds another part of the circuit, located on a small board...

    Thank you in advance,
    Roger
    Attached Files
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