Author Topic: Fake Nippon Chemi-con capacitors at Ebay?  (Read 12538 times)

0 Members and 1 Guest are viewing this topic.

Offline hansibull

  • Regular Contributor
  • *
  • Posts: 56
Fake Nippon Chemi-con capacitors at Ebay?
« on: May 24, 2014, 10:54:34 am »
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 capacitor at their website rated 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", but Here 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"
« Last Edit: May 25, 2014, 07:06:56 pm by GeoffS »
 

Offline wilfred

  • Super Contributor
  • ***
  • Posts: 4936
  • Country: au
Re: Fake Nippon Chemi-con capacitors at Ebay?
« Reply #1 on: May 24, 2014, 11:58:15 am »
The link failed for me so this is where I ended up
http://www.ebay.com/itm/1PCS-63V-22000UF-M-Electrolytic-Capacitor-35X51MM-B47-/130807909622

This listing doesn't mention "Nippon" anywhere. So are they deliberately avoiding mention of the name to avoid detection as a seller of fakes or are they just selling components with no particular concern for the pedigree. Pehaps clearing surplus or obsolete stocks.

From the N-C website comes this statement about purchasing only from official channels.
http://www.chemi-con.co.jp/e/counterfeit.html
« Last Edit: May 24, 2014, 12:12:44 pm by wilfred »
 

Online theatrus

  • Frequent Contributor
  • **
  • Posts: 344
  • Country: us
Re: Fake Nippon Chemi-con capacitors at Ebay?
« Reply #2 on: May 24, 2014, 12:27:44 pm »
It's very likely a fake.

Stick 60V on it and measure.
Software by day, hardware by night; blueAcro.com
 

Online wraper

  • Supporter
  • ****
  • Posts: 7322
  • Country: lv
Re: Fake Nippon Chemi-con capacitors at Ebay?
« Reply #3 on: May 24, 2014, 12:34:10 pm »
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.
« Last Edit: May 24, 2014, 12:37:15 pm by wraper »
 

Offline marshallh

  • Supporter
  • ****
  • Posts: 1454
  • Country: us
    • retroactive
Re: Fake Nippon Chemi-con capacitors at Ebay?
« Reply #4 on: May 25, 2014, 04:08:31 am »
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.
Verilog tips
BGA soldering intro

11:37 <@ktemkin> c4757p: marshall has transcended communications media
11:37 <@ktemkin> He speaks protocols directly.
 

Offline Rasz

  • Super Contributor
  • ***
  • Posts: 1958
  • Country: 00
    • My random blog.
Re: Fake Nippon Chemi-con capacitors at Ebay?
« Reply #5 on: May 25, 2014, 07:02:04 pm »
rip one open
Who logs in to gdm? Not I, said the duck.
My fireplace is on fire, but in all the wrong places.
 

Offline Psi

  • Super Contributor
  • ***
  • Posts: 6358
  • Country: nz
Re: Fake Nippon Chemi-con capacitors at Ebay?
« Reply #6 on: May 25, 2014, 07:23:25 pm »
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.



Greek letter 'Psi' (not Pounds per Square Inch)
 

Offline fluxcapacitor

  • Frequent Contributor
  • **
  • Posts: 345
  • Country: gb
Re: Fake Nippon Chemi-con capacitors at Ebay?
« Reply #7 on: May 26, 2014, 12:30:37 am »
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
 

Offline DJ

  • Supporter
  • ****
  • Posts: 129
  • Country: us
Re: Fake Nippon Chemi-con capacitors at Ebay?
« Reply #8 on: May 26, 2014, 06:47:43 am »
It's very likely a fake.

Stick 60V on it and measure.

Don't turn it on...



Tear it apart!!! :)
 

Offline hansibull

  • Regular Contributor
  • *
  • Posts: 56
Re: Fake Nippon Chemi-con capacitors at Ebay?
« Reply #9 on: May 26, 2014, 09:10:15 pm »
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!
 

Offline fluxcapacitor

  • Frequent Contributor
  • **
  • Posts: 345
  • Country: gb
Re: Fake Nippon Chemi-con capacitors at Ebay?
« Reply #10 on: May 27, 2014, 03:09:24 am »
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.l2563

http://stores.ebay.co.uk/h-m-comp
 

Offline rastro

  • Frequent Contributor
  • **
  • Posts: 289
  • Country: 00
Re: Fake Nippon Chemi-con capacitors at Ebay?
« Reply #11 on: May 27, 2014, 04:55:19 am »
It's very likely a fake.

Stick 60V on it and measure.

Don't turn it on...



Tear it apart!!! :)

Hmmm.  Makes you wonder what's in that 22,000uF Rubi-con.
 

Offline retrolefty

  • Super Contributor
  • ***
  • Posts: 1565
  • Country: us
  • measurement changes behavior
Re: Fake Nippon Chemi-con capacitors at Ebay?
« Reply #12 on: May 27, 2014, 05:27:25 am »
Quote
Hmmm.  Makes you wonder what's in that 22,000uF Rubi-con.

 It's Turtles all the way down.
 

Online TimNJ

  • Frequent Contributor
  • **
  • Posts: 509
  • Country: us
Re: Fake Nippon Chemi-con capacitors at Ebay?
« Reply #13 on: May 27, 2014, 08:13:59 am »
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!
« Last Edit: May 27, 2014, 08:15:31 am by TimNJ »
 

Offline max666

  • Frequent Contributor
  • **
  • Posts: 366
  • Country: at
Re: Fake Nippon Chemi-con capacitors at Ebay?
« Reply #14 on: May 27, 2014, 08:29:54 am »
Quote
Hmmm.  Makes you wonder what's in that 22,000uF Rubi-con.

 It's Turtles all the way down.

Thank you! I needed that laugh today  :-DD
 

Offline echen1024

  • Super Contributor
  • ***
  • Posts: 1666
  • Country: us
  • 15 yo Future EE
Re: Fake Nippon Chemi-con capacitors at Ebay?
« Reply #15 on: May 28, 2014, 01:30:43 pm »
Quote
Hmmm.  Makes you wonder what's in that 22,000uF Rubi-con.

 It's Turtles all the way down.

Thank you! I needed that laugh today  :-DD
Down to that little 4.7pF. Now why is my power supply not working?
I'm not saying we should kill all stupid people. I'm just saying that we should remove all product safety labels and let natural selection do its work.

http://www.youtube.com/user/echen1024
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf