Connect with us

Identify this 4 legged creature.

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

Scroll to continue with content
  1. shyronnie

    shyronnie

    25
    0
    Nov 1, 2011
    Hello.

    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.

    http://i.imgur.com/55i9T.jpg 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

    25,448
    2,809
    Jan 21, 2010
    My guess is that it is an optocoupler.
     
  3. shyronnie

    shyronnie

    25
    0
    Nov 1, 2011
    Can this really tolerate a 12V fan? 50x50

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

    shrtrnd

    3,781
    499
    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

    shyronnie

    25
    0
    Nov 1, 2011

    Thank you guys!
     
  6. nepow

    nepow

    99
    1
    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

    shyronnie

    25
    0
    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.
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-