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Can anyone identify these capacitors?

Discussion in 'General Electronics Discussion' started by deadvirus, Aug 18, 2012.

  1. deadvirus

    deadvirus

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    0
    Aug 18, 2012
    These are on a laptop motherboard but I can't get the schematic for it.

    [​IMG]
    [​IMG]
    [​IMG]
     
  2. CocaCola

    CocaCola

    3,635
    5
    Apr 7, 2012
    They are Fujitsu caps, first line is the series... I believe Fuijitsu sold the capacitor lines off to Nichicon now so series might have changed...

    Second line is the value, using normal 3 digit capacitor codes (example 331 = 330pF & 391 = 390pF)

    Third line is the voltage rating
     
  3. deadvirus

    deadvirus

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    0
    Aug 18, 2012
    Thank you so much!!
     
  4. alfa88

    alfa88

    324
    4
    Dec 1, 2010
    That red mark looks like a polarizing indication. Do you think they might be electrolytics and perhaps a much higher value. Example: 331=330uF.
     
  5. gorgon

    gorgon

    603
    24
    Jun 6, 2011
    From what I've seen before the value is based on uF, not pF in this case.

    331 is 330uF

    TOK ;)
     
  6. davenn

    davenn Moderator

    13,347
    1,774
    Sep 5, 2009
    agreed, you are not likely to see 330pF electrolytic caps ;)


    Dave
     
  7. CocaCola

    CocaCola

    3,635
    5
    Apr 7, 2012
    Good catch...
     
  8. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,214
    2,695
    Jan 21, 2010
    In addition, these are solid polymer capacitors, similar to a VERY low ESR electrolytic capacitor.

    Check this thread for a recent query about almost exactly the same thing where you'll find some specific information.
     
  9. sandipgolani

    sandipgolani

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    0
    Aug 21, 2012
    These are in modern motherboards are called as solid state capacitors they are solid polymer capacitors. If you see some old motherboards you will find approx 12000uF to 20000 uF capacitance where used but instead today its just total around 1200uF to 1600 uF capacitance is used. So as steve said it has a very low ESR.
     
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