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Old 7th April 2006, 10:09 AM   #1
AndrewT is offline AndrewT  Scotland
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Question ceramic capacitors ?

Hi all,
what is the difference between NPO and COG ceramic capacitors?

How might it affect their intended end use?
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Old 7th April 2006, 10:20 AM   #2
mzzj is offline mzzj  Finland
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Default Re: ceramic capacitors ?

Quote:
Originally posted by AndrewT
Hi all,
what is the difference between NPO and COG ceramic capacitors?

How might it affect their intended end use?
Nada, they are same thing. And its NP0 and C0G, not NPO or COG
"Negative-Positive-Zero" as tempco is +-30ppm
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Old 7th April 2006, 11:27 AM   #3
AndrewT is offline AndrewT  Scotland
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Thanks Mzzj,

What is C0G?
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Old 7th April 2006, 02:48 PM   #4
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COG is the name of the dielectric type.
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Old 7th April 2006, 05:03 PM   #5
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C0G capacitors have excellent dielectric characteristics which compete with better film varieties: low distortion, low DA, low DF. X5R capacitors, and its siblings, are another matter entirely having dielectric characteristics that compete with the worst of electrolytics for Worst Capacitor Ever.
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Old 7th April 2006, 05:39 PM   #6
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Seeing as I mentioned the dreaded X5R, here's a distortion plot of an X7R. Says Cyril Bateman who performed the test generating the plot:

"This 10nF X7R ceramic was made by a CECC approved, European manufacturer. It was tested at 1kHz and 3 volts, in series with a 10k ohm current limiting resistor. Measurable distortion exists at all voltages down to 0.5 volts – my lowest test voltage."
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File Type: jpg x7r.jpg (88.7 KB, 1468 views)
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Old 7th April 2006, 05:53 PM   #7
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Here's the same test on a C0G.
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File Type: jpg c0g.jpg (89.4 KB, 1224 views)
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Old 7th April 2006, 06:16 PM   #8
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I've been using NPO/COG caps in a variety of places with extremely good results,..at least to the ear.
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Old 7th April 2006, 06:29 PM   #9
AndrewT is offline AndrewT  Scotland
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Hi Serenq,
that's some difference -63db (x7r) reduced to -127db for the C0G.

Thanks to all.

Is the low distortion an indication that ppm/V is not an issue for C0G and NP0 when used in Audio locations. We all use ceramic in bypass duty.
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Old 7th April 2006, 06:30 PM   #10
infinia is offline infinia  United States
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Hi Tom,
Thanks for the plots. Do you have the test configuration diagram?

Too bad ceramics a got a bad rap in the audio world. They are really good performers if used properly. But can a nightmare if misused. (piezo microphonics). I still use em X7R included and could not be without.
Generally use for low imp/supply bypass. Never in high imp/ high gain circuits like feedback networks. NP0's abound in RF world up to several GHz.
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