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2200uF 100V COG ceramic for under 10 cents

Discussion in 'Electronic Design' started by Jeff L, May 19, 2007.

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  1. Jeff L

    Jeff L Guest

    Apparently Digikey sells one. Part number:

    B37986G1222J051

    It's actually a 2200 pF cap, but I wonder how long till that size ceramic
    caps are available. At the rate ceramic cap development is going with the
    new dielectrics, it won't be too far off.

    Digikey should give a discount or something (to a maximum of a reasonable
    value) for reporting such gross errors.
     
  2. MooseFET

    MooseFET Guest

    It won't be an NPO/COG. All of the high K ceramics are temperature
    dependant, nonlinear and piezo-electric. They are fine in cases where
    the exact value doesn't matter much but they can't be used for good
    filters or accurate timers.
     
  3. Winfield

    Winfield Guest

    The EPCOS 2200pF 100V is an honest C0G cap, with a low
    tempco, and presumably low DA as well, see page 9:
    http://www.epcos.com/inf/20/10/db/cc_07/C0G_Leaded.pdf
    As for another factor of 10, let alone 100 or 1000...

    DigiKey's highest value is 0.01uF 50V, # B37986G5103J054,
    1620 pieces in stock for $0.36 or $0.28, qty 10 or 100.
    http://rocky.digikey.com/scripts/ProductInfo.dll?Site=US&V=495&M=B37986G5103J054
     
  4. MooseFET

    MooseFET Guest

    I was refering to the value in the title. I guess I should have been
    a bit clearer.

    BTW: We get 0.01u NPOs so 2200pF isn't at the extreme anymore.
     
  5. Robert Baer

    Robert Baer Guest

    New materials are far from c0G capability...
     
  6. Robert Baer

    Robert Baer Guest

    All i could find for NPO in DigiKey was their PCC2167 (1206 0.01uF
    @50V), their 490-1765 (1206 0.082uF @50V), and the 490-1767 (1206 0.1uF
    @25V).
    If one does not care about the dielectric but still wants a "low" TC,
    their 490-1941 gives us 2220 in X7R at 4.7uF, 50V 10%.
    Not too shabby..
     
  7. Eugene Rice

    Eugene Rice Guest


    Is the "0" in C0G a zero or an oh?
     
  8. MooseFET

    MooseFET Guest

    Its oh.
     
  9. Guest

    So yesterday, having specially wound 2 off T50-3 toroids with 80 turns
    each (losing the will to live in the process), I assembled the
    bandpass filter using 220pF ceramics from the drawer. Toroid Q's
    measured in at a nice 280.
    Swept the filter. Near useless, 20dB loss. 'Twas the damned ceramic
    caps. Turned out their Q's were a useless '30'. Checked the drawers
    and all the ceramics >100pF were crappy medium K with 30ish Qs.
    Originally bought in as nice low K-NPO-COG types.

    Yes please. Bigger COG/NPO/Lo K caps (and bought in inductors). Sod
    those ludicrously expensive Silver Mica things And please please could
    they be moulded in a different body colour?. And could Farnell please
    stock 'em in values greater than 330pF.
     
  10. MooseFET

    MooseFET Guest

    Yes, that does seem to be the standard. Out in the rest of the world
    however, it appears that it is written with a oh more often than not.
    cog capacitor gets more than twice the google hits of c0g capacitor.
     

  11. SO? DB9 gets a lot more hits than DE9, but its still wrong.


    Results 1 - 100 of about 575,000 for DB9 connector. (0.40 seconds)
    Results 1 - 100 of about 10,400 for DE9 connector. (0.32 seconds)


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  12. Tom Bruhns

    Tom Bruhns Guest


    I recall Bob Pease mentioning that DigiKey sells rather much larger
    C0G values than that for reasonable prices, so now it's a challenge to
    find what the largest really is...
    it took well under a minute to find 445-2709-1, 0.22uF 50V, but none
    in stock at the moment. On the other hand, 445-2708-1, 0.15uF 50V, is
    in stock. It's an 1812 size SMT part, not too bad for size. The data
    sheet suggests a volume that yields about 450 parts per cubic inch, so
    you could get about 68uF at 50V per cubic inch, for about $400.
    Quantity drops the price pretty quickly, so you can get 330uF/50V for
    about $1500.

    Cheers,
    Tom
     
  13. Lots of people say oh when they mean zero when saying the
    digits of a number. That doesn't make them right, but it is
    something to understand that is a common practice.
     
  14. MooseFET

    MooseFET Guest

    The purpose of language is to communicate. The DB9 case is a classic
    example of how the language evolves. Assuming we are still using the
    DE9 in a few more decades, everyone will call it "DB9" so if you want
    them to understand you, you'd have to say "DB9"
     
  15. And so on, ad.. well..

    "ad nauseam" 939,000
    "ad nauseum" 947,000



    Best regards,
    Spehro Pefhany
     
  16. Robert Baer

    Robert Baer Guest

    I believe it is a zero...for zero TC.
     

  17. I don't care if "They" understand. The part number is DE-9 from any
    reputable manufacturer or distributor.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
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