Fake Nippon Chemi-con capacitors at Ebay?

[hansibull]

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"

[theatrus]

It's very likely a fake.

Stick 60V on it and measure.

[wraper]

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.

[marshallh]

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.

[Rasz]

rip one open

[Psi]

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.

[fluxcapacitor]

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

[DJ]

It's very likely a fake.

Stick 60V on it and measure.

Don't turn it on...



Tear it apart!!!

[hansibull]

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!

[fluxcapacitor]

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

[rastro]

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.

[retrolefty]

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

 It's Turtles all the way down.

[TimNJ]

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!

[max666]

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 

[echen1024]

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 

Down to that little 4.7pF. Now why is my power supply not working?