Question about an SMD capacitor. - Page 1
Forum section: electronics / projects

author: Carrington
author_rank: Super Contributor
timestamp: April 13, 2014, 08:40:02 pm
content: Hi guys!Anybody know:Who is the manufacturer of this capacitor?And what type of capacitor is?Thanks.

author: 8086
author_rank: Super Contributor
timestamp: April 13, 2014, 08:41:32 pm
content: No, and no.Your best bet is to measure it with an ESR meter and find an equivalent.

author: Carrington
author_rank: Super Contributor
timestamp: April 13, 2014, 09:19:42 pm
content: Quote from: 8086 on April 13, 2014, 08:41:32 pmNo no no...I'm sorry, but I need to know the manufacturer and the type.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: April 13, 2014, 09:25:46 pm
content: Kemet 3900pF. Package size, voltage and material/tempco unknown (although it obviously isn't one of the types printing is not available on).page 504http://www.kemet.com/Lists/ProductCatalog/Attachments/364/KEM_CC101_COMM_SMD.pdfTim

author: Carrington
author_rank: Super Contributor
timestamp: April 13, 2014, 09:36:42 pm
content: Quote from: T3sl4co1l on April 13, 2014, 09:25:46 pmYes, 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.

author: tszaboo
author_rank: Super Contributor
timestamp: April 13, 2014, 10:24:31 pm
content: wow, that smd ceramic capacitor actually has a marking... I think it is one of the rarest thing in the world.

author: 8086
author_rank: Super Contributor
timestamp: April 13, 2014, 10:33:28 pm
content: Oops, I meant LCR meter earlier, not ESR meter...I'm amazed it was identified, good job.

author: c4757p
author_rank: Super Contributor
timestamp: April 13, 2014, 11:10:19 pm
content: Quote from: NANDBlog on April 13, 2014, 10:24:31 pmNow if only they thought to mark it "3n9" or "392"...

author: Carrington
author_rank: Super Contributor
timestamp: April 13, 2014, 11:14:00 pm
content: Quote from: 8086 on April 13, 2014, 10:33:28 pmDon't worry, we're human.

author: Carrington
author_rank: Super Contributor
timestamp: April 13, 2014, 11:16:09 pm
content: Quote from: NANDBlog on April 13, 2014, 10:24:31 pmYes is true, is not very common.

author: Carrington
author_rank: Super Contributor
timestamp: April 13, 2014, 11:24:50 pm
content: Quote from: c4757p on April 13, 2014, 11:10:19 pmNo 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.

author: Richard Head
author_rank: Frequent Contributor
timestamp: April 14, 2014, 08:21:44 am
content: 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.

author: Carrington
author_rank: Super Contributor
timestamp: April 14, 2014, 12:02:28 pm
content: Quote from: Richard Head on April 14, 2014, 08:21:44 amProbably 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_capacitorsTª Coefficient X7R:http://www.digikey.es/product-detail/en/C1206C392K5RACTU/399-1229-2-ND/411228(Brown colour)

author: DmitryL
author_rank: Regular Contributor
timestamp: April 14, 2014, 12:59:45 pm
content: Quote from: Carrington on April 14, 2014, 12:02:28 pmIf 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

author: Carrington
author_rank: Super Contributor
timestamp: April 14, 2014, 01:22:54 pm
content: Quote from: DmitryL on April 14, 2014, 12:59:45 pmA 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.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: April 15, 2014, 01:35:45 am
content: Perform the measurement at high temperature. Anything other than C0G will be down by 20% or more at 100C+.Tim

author: electron_misfire
author_rank: Contributor
timestamp: April 15, 2014, 08:02:36 am
content: Quote from: NANDBlog on April 13, 2014, 10:24:31 pmIt's quite annoying when working with SMD capacitors when they don't have a single mark on them.

author: SeanB
author_rank: Super Contributor
timestamp: April 15, 2014, 07:55:56 pm
content: That is a good reason to have a LCR meter though, to not have to play the guessing game too much.

author: Aigars
author_rank: Regular Contributor
timestamp: April 17, 2014, 04:19:18 pm
content: tray chek therehttp://www.koaspeer.com/products/inductors/surface-mount-inductors/kq/