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Surface mount capacitors

Discussion in 'Electronic Components' started by SAM, Apr 28, 2006.

  1. SAM

    SAM Guest

    Has anyone seen the capacitor code printed on surface mount capacitors, all
    the surface mount capacitors I have seen in New Zealand sold for
    manufacturing are blank. Most resistors are marked, e.g. 223 equals 22K Ohms
     
  2. I.F.

    I.F. Guest

    The few I've seen with a code have not had the value indicated - I'm not
    sure if the codes I've seen are dielectric, tolerance or tempco!
     
  3. I have not been able to find any marked, too small most likely. I built a
    capacitance meter mainly for that very purpose of surface mount ID. I seem
    to have ended up with a drawer of misc parts and the meter is the only way
    to find what you need. JTT
     

  4. Some SMD ceramic capacitors are marked with a letter/number code.
    The letter is the base value and the number is the multiplier. A
    Javascript decoder is available on my website:
    <http://home.earthlink.net/~mike.terrell/ID/SMD_caps.html>


    --
    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
     
  5. I.F.

    I.F. Guest

    The meter I use is a Peak-Atlas LCR40 with digital display, the price is a
    bit nasty at £80 and the add on lead kit with croc-clips and SMD tweezer
    probes is also nasty at £35, but it is a handy item of kit.
     
  6. Thank you mike for that info. That is just what the doctor ordered. Now if I
    can find the edison glases to read the codes :)
     
  7. SAM

    SAM Guest

    you said ==>too small most likely.


    I say ===> pull my other tit, they are about the same size as resistors and
    they are marked.








    I have not been able to find any marked, too small most likely. I built a
    capacitance meter mainly for that very purpose of surface mount ID. I seem
    to have ended up with a drawer of misc parts and the meter is the only way
    to find what you need. JTT
     
  8. Well maybe its my old eyes. I need glasses and a magnifier to read them.
    You said in your original post they were not marked, and now you say they
    are marked.
    The small one's I have are not usually marked. 0805 is about as small as I
    want to go.
     

  9. Some are, and some are not. It usually costs more to purchase reels
    of marked SMD capacitors and not all are installed right side up, if
    they are marked. I worked in electronic manufacturing for a number of
    years, and saw them come in both ways. We always tried to get marked
    parts, but sometimes they were unavailable in time so we had to go to a
    second or third source. The markings are faint at best. I read them
    through a stereo microscope and some required a small drop of IPA to
    make the marking visible.


    --
    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
     
  10. Hal Murray

    Hal Murray Guest

    So why are capacitors less likely to be marked than resistors?

    There must be a good story there.

    Most 0603 resistors I see are marked. 3 digits are easy to read.
    I sometimes have to work a bit with letters on the 1% parts. (That's
    after getting out a magnifying glass. My eyes don't focus up close
    any more.)

    I don't remember seeing any 0603 caps with markings.
     
  11. SAM

    SAM Guest

    yes that was my point I have never seen any 0603 capacitors marked
    while 99.9% of 0603 resistors I have seen have been marked.



    So why are capacitors less likely to be marked than resistors?

    There must be a good story there.

    Most 0603 resistors I see are marked. 3 digits are easy to read.
    I sometimes have to work a bit with letters on the 1% parts. (That's
    after getting out a magnifying glass. My eyes don't focus up close
    any more.)

    I don't remember seeing any 0603 caps with markings.

    --
    The suespammers.org mail server is located in California. So are all my
    other mailboxes. Please do not send unsolicited bulk e-mail or unsolicited
    commercial e-mail to my suespammers.org address or any of my other
    addresses.
    These are my opinions, not necessarily my employer's. I hate spam.
     
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