Question about an SMD capacitor.

[Carrington]

Hi guys!

Anybody know:
Who is the manufacturer of this capacitor?
And what type of capacitor is?

Thanks.

[8086]

No, and no.

Your best bet is to measure it with an ESR meter and find an equivalent.

[Carrington]

No, and no.

Your best bet is to measure it with an ESR meter and find an equivalent.

No no no... 

I'm sorry, but I need to know the manufacturer and the type.

[T3sl4co1l]

Kemet 3900pF.  Package size, voltage and material/tempco unknown (although it obviously isn't one of the types printing is not available on).

page 504 http://www.kemet.com/Lists/ProductCatalog/Attachments/364/KEM_CC101_COMM_SMD.pdf

Tim

[Carrington]

Kemet 3900pF.  Package size, voltage and material/tempco unknown (although it obviously isn't one of the types printing is not available on).

page 504 http://www.kemet.com/Lists/ProductCatalog/Attachments/364/KEM_CC101_COMM_SMD.pdf

Tim

Yes, exactly, it matches. My LCR measured 3.83 nF.
Thank you very much. 


Laser marking option is not available on:
• C0G, Ultra Stable X8R and Y5V dielectric devices
• EIA 0402 case size devices
• EIA 0603 case size devices with Flexible Termination option.
• KPS Commercial and Automotive Grade stacked devices.

So probably is an X7R.

[tszaboo]

wow, that smd ceramic capacitor actually has a marking... I think it is one of the rarest thing in the world.

[8086]

Oops, I meant LCR meter earlier, not ESR meter...

I'm amazed it was identified, good job.

[c4757p]

wow, that smd ceramic capacitor actually has a marking... I think it is one of the rarest thing in the world.

Now if only they thought to mark it "3n9" or "392"...

[Carrington]

Oops, I meant LCR meter earlier, not ESR meter...

I'm amazed it was identified, good job.

Don't worry, we're human. 

[Carrington]

wow, that smd ceramic capacitor actually has a marking... I think it is one of the rarest thing in the world.

Yes is true, is not very common.

[Carrington]

wow, that smd ceramic capacitor actually has a marking... I think it is one of the rarest thing in the world.

Now if only they thought to mark it "3n9" or "392"...

No idea of how they choose marking codes, but not much space to write, the small case is a 805 (I need a microscope to read them):
  - KS3   4.7nF, read 4.69nF.
  - KW2 680pF, read 686pF.
  - KA2  100pF, read 101pF.

[Richard Head]

That colour (light grey) dielectric is usually NPO or COG. The brown colour is normally X7R.
I'm sure it's NPO/COG for that reason.

[Carrington]

That colour (light grey) dielectric is usually NPO or COG. The brown colour is normally X7R.
I'm sure it's NPO/COG for that reason.

Probably you're right, that's what I thought initially, but according to the datasheet: "Laser marking option is not available on: C0G, Ultra Stable X8R, ...".
However, at the moment I prefer to believe that they are COG/NPO. I discard polyphenylene sulfide (PPS). It's rare, right?

Dielectric Material PPS: http://www.hitachiaic.com/products/plastic_film_chip_capacitors
Tª Coefficient X7R: http://www.digikey.es/product-detail/en/C1206C392K5RACTU/399-1229-2-ND/411228 (Brown colour)

[DmitryL]

That colour (light grey) dielectric is usually NPO or COG. The brown colour is normally X7R.
I'm sure it's NPO/COG for that reason.

Probably you're right, that's what I thought initially, but according to the datasheet: "Laser marking option is not available on: C0G, Ultra Stable X8R, ...".
However, at the moment I prefer to believe that they are COG/NPO. I discard polyphenylene sulfide (PPS). It's rare, right?

If you have an access to more or less decent LCR meter, you can easily distinguish between NP0 and X7R types of ceramic capacitors. NP0 ones have Q around 1000 or more, when X5R and worse types have Q around 100. I have seen NP0 capacitors that have the same brown color as X7R, though they tend to be white grey or pinkish

[Carrington]

If you have an access to more or less decent LCR meter, you can easily distinguish between NP0 and X7R types of ceramic capacitors. NP0 ones have Q around 1000 or more, when X5R and worse types have Q around 100. I have seen NP0 capacitors that have the same brown color as X7R, though they tend to be white grey or pinkish

A DER EE DE-5000 read a Q between 800 and 1800, nothing close to 100. So definitely are NP0. 
Moreover, the Q factor estimation by a DE-5000 is very unstable.

[T3sl4co1l]

Perform the measurement at high temperature.  Anything other than C0G will be down by 20% or more at 100C+.

Tim

[electron_misfire]

wow, that smd ceramic capacitor actually has a marking... I think it is one of the rarest thing in the world.

It's quite annoying when working with SMD capacitors when they don't have a single mark on them. 

[SeanB]

That is a good reason to have a LCR meter though, to not have to play the guessing game too much.

[Aigars]

tray chek there
http://www.koaspeer.com/products/inductors/surface-mount-inductors/kq/