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ceramic chip capacitor leakage?

D

dave94024

Jan 1, 1970
0
Anyone have a sense for what the leakage range for ceramic chip
capacitors (0201 - 0603 packages) is?

In particular I'm looking for a 10nf 25-50v ceramic cap in let's say
an 0402 package with about a +/-10% tolerance or better.

Any idea?

Thanks,
Dave.
 
J

Joerg

Jan 1, 1970
0
dave94024 said:
Anyone have a sense for what the leakage range for ceramic chip
capacitors (0201 - 0603 packages) is?

In particular I'm looking for a 10nf 25-50v ceramic cap in let's say
an 0402 package with about a +/-10% tolerance or better.

Any idea?

Very little, in the nA range IME. But you need to consult the data sheet
which lists the maximum.
 
D

dave94024

Jan 1, 1970
0
Very little, in the nA range IME. But you need to consult the data sheet
which lists the maximum.

That was my opinion as well, but I haven't found a datasheet for a
ceramic chip cap with leakage information in it. Do you have one? Or
know where I could find one?

Thanks,
Dave.
 
S

Spehro Pefhany

Jan 1, 1970
0
Anyone have a sense for what the leakage range for ceramic chip
capacitors (0201 - 0603 packages) is?

In particular I'm looking for a 10nf 25-50v ceramic cap in let's say
an 0402 package with about a +/-10% tolerance or better.

Any idea?

Thanks,
Dave.

Check the data sheets and get back to us if you don't understand the
specs. It is too insignificant to matter in most (not all) cases.


Best regards,
Spehro Pefhany
 
D

dave94024

Jan 1, 1970
0
Check the data sheets and get back to us if you don't understand the
specs. It is too insignificant to matter in most (not all) cases.

Best regards,
Spehro Pefhany
--

For example, the following are datasheets for ceramic caps.

http://www.kemet.com/kemet/web/homepage/kechome.nsf/vapubfiles/
F3102_X7R.pdf/$file/F3102_X7R.pdf
http://www.tdk.co.jp/tefe02/e412_c.pdf
http://rocky.digikey.com/WebLib/AVX/Web Data/X7R (C).pdf

I couldn't find anything relevant to leakage in the first two
datasheets. The third datasheet had some numbers for the insulation
resistance, is this equivalent to Rp (parallel leakage resistance) for
the part? If so, we are looking at something on the order of 1na
which works for my application.

Thanks,
Dave.
 
C

chuck

Jan 1, 1970
0
dave94024 said:
For example, the following are datasheets for ceramic caps.

http://www.kemet.com/kemet/web/homepage/kechome.nsf/vapubfiles/
F3102_X7R.pdf/$file/F3102_X7R.pdf
http://www.tdk.co.jp/tefe02/e412_c.pdf
http://rocky.digikey.com/WebLib/AVX/Web Data/X7R (C).pdf

I couldn't find anything relevant to leakage in the first two
datasheets. The third datasheet had some numbers for the insulation
resistance, is this equivalent to Rp (parallel leakage resistance) for
the part? If so, we are looking at something on the order of 1na
which works for my application.

Thanks,
Dave.
Insulation resistance is basically the DC leakage resistance. Here's a
link to some additional info:

http://72.14.253.104/search?q=cache...r+leakage+resistance&hl=en&gl=us&ct=clnk&cd=1

Chuck
 
S

Spehro Pefhany

Jan 1, 1970
0
For example, the following are datasheets for ceramic caps.

http://www.kemet.com/kemet/web/homepage/kechome.nsf/vapubfiles/
F3102_X7R.pdf/$file/F3102_X7R.pdf
http://www.tdk.co.jp/tefe02/e412_c.pdf

TDK says 10G minimum after 60s at rated voltage, at least for these
parts:
http://www.component.tdk.com/spec_gen.php?item_name=C0603C0G1H020DT&class_code=TJA037

http://rocky.digikey.com/WebLib/AVX/Web Data/X7R (C).pdf

I couldn't find anything relevant to leakage in the first two
datasheets. The third datasheet had some numbers for the insulation
resistance, is this equivalent to Rp (parallel leakage resistance) for
the part? If so, we are looking at something on the order of 1na
which works for my application.

Yes. The AVX spec is the lesser of 100G or 1000M-uF. Since you have
0.01uF, the two numbers are the same. Above 10n the dielectric leakage
appears to dominate, below it's the 'package' leakage is my
interpretation of the specs.
Thanks,
Dave.


Best regards,
Spehro Pefhany
 
P

Paul Burke

Jan 1, 1970
0
dave94024 said:
Anyone have a sense for what the leakage range for ceramic chip
capacitors (0201 - 0603 packages) is?

If it's that critical, I suspect the leakage along the surface of the
board will be greater.
 
J

Joerg

Jan 1, 1970
0
dave94024 said:
That was my opinion as well, but I haven't found a datasheet for a
ceramic chip cap with leakage information in it. Do you have one? Or
know where I could find one?

Ok, Dave, I also happened to need resistance info on a 10uF/4V ceramic
cap in a design today because this design uses it in a timing circuit.
Here is its data sheet and the info is at the top of page 4:

http://www.panasonic.com/industrial/components/pdf/abj0000ce4.pdf
 
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