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Identify this 4 legged creature.

Discussion in 'Datasheets, Manuals and Component Identification' started by shyronnie, Jan 17, 2013.

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  1. shyronnie


    Nov 1, 2011

    Can anyone help me identify this chip?
    The leg in the bottom right feeds a 12 volts fan which takes the heat of this Li-ion battery charger by Ningbo (china).

    The fan does not power on anymore, but works fine if I power it directly with a PSU.
    The chip says B0912817C i think

    I have searched but nothing comes up. Picture of the chip

    I think that it is toast because of the rust an all. Maybe it has shorted.

    Thank you in advance!
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    My guess is that it is an optocoupler.
  3. shyronnie


    Nov 1, 2011
    Can this really tolerate a 12V fan? 50x50

    Seems very tiny for controlling something that big.
  4. shrtrnd


    Jan 15, 2010
    I don't design them, maybe that's why it failed (if the original design was borderline).
    I agree with *steve*, it's probably an 817C optocoupler.
    the 0912 is probably the date code, 2009, 12th week of manufacture.
    They're cheap. Good luck.
  5. shyronnie


    Nov 1, 2011

    Thank you guys!
  6. nepow


    Jul 18, 2011
    Looks as though the legs have coroded? Should you replace the device closely check that the circuit board copper tracks have not coroded away. I also agree... It's an opto coupler device. Finally make sure no moisture or fluids can contaminate the circuit board!
  7. shyronnie


    Nov 1, 2011
    I have changed the optocoupler, bit the old optocoupler worked fine apparantly.

    When i put a piece of wire to the negative leg of the two input legs, the fan begins. Just a piece of wire ?!
    The two resistors are both connected to that leg in one end. It hink it is like a voltage devider or something.
    I measure a voltage drop og 200 volts across the nearest resistor, but i cannot measure resistance as it is in circuit.

    Some of the resistor legs are also a bit rusty.
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