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Old 9th February 2009, 04:39 AM   #1
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Default Value of SMD capacitor

Can anyone tell me where I can find the code to determine the value of this capacitor. It's an 0805 size. Thanks in advance.



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Old 9th February 2009, 04:49 AM   #2
infinia is offline infinia  United States
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Hi
It's markings youre looking for is most probably on the bottom side. Look for other similar caps on the board to get a better clue on these. I guess no schematics are avalible?
BTW impressive photo shot! How did you do that?

looked it up myself
edit>http://www.dpreview.com/reviews/canons3is/page2.asp
&cropped macro shot
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Old 9th February 2009, 05:00 AM   #3
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Correct, no schematic available. The marking on the other side is the same.

The photo is not as good as it could be. The camera/lens can do better. It was taken with a canon S3 and a Raynox MSN-202 accessory lens on a LensMate adapter. This is a better example of what the lens can do. This is the stylus on an Audio Technica SLT88E cartridge.

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Old 9th February 2009, 05:15 AM   #4
infinia is offline infinia  United States
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Why do want to know... is it bad?
If it has same marking both sides..My guess would be 1pF ?K normally means 10% tol

http://my.execpc.com/~endlr/markings.html


Can you trace it out to a sub circuit.
Since you like to take pictures perhaps a wider shot with some background circuit/fuction info.
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Old 9th February 2009, 05:25 AM   #5
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It's shorted. It's a miller capacitor in an amplifier. I've seen values stated for it from 20pf to 100pf. Anything in that range would probably work. The one in the board measures 15pf. They both got hot so I'm not sure they're going to read the correct value. If I can find a chart, I'll know definitively the correct value.

Thanks for the help.
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Old 9th February 2009, 05:36 AM   #6
infinia is offline infinia  United States
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Might be Table 11 in the link I gave you above. I've never seen it those before.
K=22
color=red
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Old 10th February 2009, 06:23 AM   #7
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The information you provided helped me to find the following document. On page 5 it shows the marking code and logo.

http://www.kemet.com/kemet/web/homep...02_CeChPkg.pdf

Thanks again.
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Old 10th February 2009, 07:21 AM   #8
infinia is offline infinia  United States
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Default In Conclusion

"Laser marking is available as an extra-cost option for
most KEMET ceramic chips. Such marking is two
sided, and includes a K to identify KEMET, followed by
two characters (per EIA-198 ....)"


"K" to identify KEMET
"A"=1 significant digit
"1"=10 multiplier

so it's a Kemet 10pF

altho we still dont know dielectric (temp limit), tolerance, or voltage.
Thanks I learned something too. A bit esoteric tho.
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