Fake Nippon Chemi-con capacitors at Ebay? - Page 1
Forum section: electronics / general

author: hansibull
author_rank: Regular Contributor
timestamp: May 24, 2014, 12:54:34 am
content: Hi! For a few weeks ago I bought some big-as$ Nippons caps at Ebay, 22000uF, 63v.I paid roughly 6$ per cap, so I guessed these where genuine Japanese.Today I was going to find the datasheet for these puppies. I searched at Nippon Chemi-con's webpage, but I could only find 22000uF 35v caps in that package size (35mm diameter and 50mm height)The capacitors looks really genuine, with the Nippon logo and everything. The printing on my caps are crystal clear and in sync with the negative side. Still Nippon Chemi-con does not have any 22000uF capacitorat their websiterated at 63v that have this package size.Is there possible to measure a capacitor's maximum voltage limit?You can find all these capacitors at ebay if you search for "22000uF 63v", butHere is the Ebay link where I bought mine.So, why can't I find any datasheet on the internet? How can I find out if these are fake (and doesn't match the specs)?Screenshot from Nippon Chemi-con's website, filtered "22000uF", "63v"

author: theatrus
author_rank: Frequent Contributor
timestamp: May 24, 2014, 02:27:44 am
content: It's very likely a fake.Stick 60V on it and measure.

author: wraper
author_rank: Unknown
timestamp: May 24, 2014, 02:34:10 am
content: First thing you should do is to measure capacitance. They might be not 22000uF at all. Also such size capacitors more likely would be 4700uF 50V, way too small for even 10000uF.

author: marshallh
author_rank: Unknown
timestamp: May 24, 2014, 06:08:31 pm
content: If you bought from ebay and didnt get an incomplete reel, you got fakes.If it matters, dont buy it on ebay. Spend that same money at Digikey and get known real parts.

author: Rasz
author_rank: Super Contributor
timestamp: May 25, 2014, 09:02:04 am
content: rip one open

author: Psi
author_rank: Super Contributor
timestamp: May 25, 2014, 09:23:25 am
content: They could still be legit, sometimes you come across surplus stock that was made to order.Because they're custom you wont find any info on their webpage.

author: fluxcapacitor
author_rank: Frequent Contributor
timestamp: May 25, 2014, 02:30:37 pm
content: They are definitely fake, from the case size ,printing, even the leads dont seem right .Heres a link to the KMH series on digikey :http://media.digikey.com/pdf/Data%20Sheets/United%20Chemi-Con%20PDFs/KMH%20Series.pdf

author: DJ
author_rank: Unknown
timestamp: May 25, 2014, 08:47:43 pm
content: Quote from: theatrus on May 24, 2014, 02:27:44 amDon't turn it on...Tear it apart!!!

author: hansibull
author_rank: Regular Contributor
timestamp: May 26, 2014, 11:10:15 am
content: Hi guys! I measured my capacitors at my schools expensive LCR meter today, and none of the six caps measured more than 16000uF (they measured between 13000uF and 16000uF), and I also tried to vary the frequency.I'm going to contact the seller, and tell him all about this. So my advice is that if you're going to buy expensive capacitors, make sure there exist some documentation or a datasheet!

author: fluxcapacitor
author_rank: Frequent Contributor
timestamp: May 26, 2014, 05:09:24 pm
content: documentation or a datasheet! , and a trusted ebay seller.Heres a few that i use regularly as i don`t buy in large quantities just per job.Never had a problem or fake .http://stores.ebay.co.uk/PC-MotherBoard-Capacitors-Store?_trksid=p2047675.l2563http://stores.ebay.co.uk/h-m-comp

author: rastro
author_rank: Frequent Contributor
timestamp: May 26, 2014, 06:55:19 pm
content: Quote from: DJ on May 25, 2014, 08:47:43 pmHmmm. Makes you wonder what's in that 22,000uF Rubi-con.

author: retrolefty
author_rank: Super Contributor
timestamp: May 26, 2014, 07:27:25 pm
content: QuoteIt's Turtles all the way down.

author: TimNJ
author_rank: Super Contributor
timestamp: May 26, 2014, 10:13:59 pm
content: I'm sorry I didn't see this thread before but a tell tale sign for NCC capacitors is that caps rated at 105*C are almost always in brown or blue sleeves and those rated at 85*C are usually in black sleeves.So series KMH should be a brown sleeve, which by the pictures this capacitor was not so therefore it could not be real!

author: max666
author_rank: Frequent Contributor
timestamp: May 26, 2014, 10:29:54 pm
content: Quote from: retrolefty on May 26, 2014, 07:27:25 pmThank you! I needed that laugh today

author: echen1024
author_rank: Super Contributor
timestamp: May 28, 2014, 03:30:43 am
content: Quote from: max666 on May 26, 2014, 10:29:54 pmDown to that little 4.7pF. Now why is my power supply not working?