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Old 10-19-2020, 06:47 AM   #1
jayjr1105
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Default Fake KZE 680uf 16v?

I bit on a lot of 25 of these. Judging by the sellers excellent feedback (99.9) I just assume these are just old inventory. Thoughts? What type of vent/bung should I see on an authentic one?

https://www.ebay.com/itm/680uF-16V-N...5/401011429492
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Old 10-19-2020, 09:13 AM   #2
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Default Re: Fake KZE 680uf 16v?

Hmm..., the one picture in the listing isn't much to go by, but the text seems a little "off".

Here's a pic of the same cap I bought from a known reputable source (Digikey) for comparison:




Attached Images
File Type: jpg DSC_7336.JPG (2.56 MB, 79 views)
File Type: jpg DSC_7337.JPG (2.19 MB, 79 views)
File Type: jpg DSC_7338.JPG (1.06 MB, 80 views)
File Type: jpg DSC_7340.JPG (288.9 KB, 77 views)

Last edited by dmill89; 10-19-2020 at 09:16 AM..
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Old 10-19-2020, 09:20 AM   #3
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Default Re: Fake KZE 680uf 16v?

Quote:
Originally Posted by dmill89 View Post
Hmm..., the one picture in the listing isn't much to go by, but the text seems a little "off".

Here's a pic of the same cap I bought from a known reputable source (Digikey) for comparison:
Thanks for the pics, I'll compare once I receive them. Yeah the text is a little light compared to yours. The bung looks correct and they don't have vent pics. Hopefully the vent is mercedes style and not an X. I got some fake Sanyo's with an X and not a K vent. I pretty much knew those were going to be fake.
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Old 10-19-2020, 01:07 PM   #4
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Default Re: Fake KZE 680uf 16v?

Suspect that a jagged print is just as bad!
When it looks like a game with aliasing!
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Old 10-19-2020, 04:12 PM   #5
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Default Re: Fake KZE 680uf 16v?

Let us know what you find.

The seller is based off of Potomac, MD, which isn't that far from me.
Would be a good deal if they are genuine.

I don't think the text can be used too much to tell if they are genuine or not. It does look a bit "faded", or at least not as precise as on known genuine KZE's I've gotten before. But then again, I've also seen the text vary slightly between different cap batches made in different years on a lot of the Japanese caps.

And at least from the picture the seller provided, the bungs look genuine. If they were flat and not going beyond the can, I'd definitely flag them as counterfeit. But on these, the bung appears extruded like it should be on good KZE caps.

*EDIT*
I looked through the seller's entire e-cap inventory, and I saw a lot of old/retired/discontinued cap series like KME and SME (from UCC), along with PF and PL (Nichicon).

Here are a few other listings of interest:
https://www.ebay.com/itm/2200uF-16V-.../161859188724?
https://www.ebay.com/itm/1000uF-16V-.../161859345192?
https://www.ebay.com/itm/6800uF-6-3V.../161859157688?

Particularly, have a look at the second image in those listings.
A lot of these look like old stock. For example, the Nichicon PL caps in the last link appear to have a date code of year 2000. So those are already 20 year old caps, more or less.

And with that said, I think there is actually a good chance those KZEs you bought may actually turn out to be genuine, but may be slightly older stock. In any case, that's still not a bad deal. For the very old caps, though, I imagine they would need reforming after all of those years in storage. Probably still OK to use, but I'd just be a little more careful with them at this age.

Last edited by momaka; 10-19-2020 at 04:41 PM..
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Old 10-22-2020, 09:58 AM   #6
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Default Re: Fake KZE 680uf 16v?

Seem legit to me, sorry for the crap photo's, I used my tablet instead of my phone because it was all I had at the time.




This said 665uf - vloss 1.6%

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Old 10-22-2020, 01:56 PM   #7
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Default Re: Fake KZE 680uf 16v?

close up pics of the bung please! usually thats a dead giveaway.
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Old 10-22-2020, 02:08 PM   #8
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Default Re: Fake KZE 680uf 16v?

Quote:
Originally Posted by ChaosLegionnaire View Post
close up pics of the bung please! usually thats a dead giveaway.
I'll get some nice clear shots later tonight. I went home for lunch and they were in the mailbox but I left my phone in the car so I had to take pics with my horrible tablet. The Bungs looked pretty much like the genuine ones linked above. I'll still post pics later on

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Old 10-22-2020, 04:51 PM   #9
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Default Re: Fake KZE 680uf 16v?

Link to pics listed on previous post. Won't let me edit it anymore to move it here. Link is to imgur album
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Old 10-23-2020, 08:11 AM   #10
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Default Re: Fake KZE 680uf 16v?

It looks legit to me - there are several different plants as well as contract production from Korea Chemicon and other affiliates. Japanese production tends to have thin vents and a shiny aluminium finish, while contract production tends to have wider vents and a slightly matt aluminium finish. If it measures within spec on capacitance and ESR, it's likely to be legit.
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Old 10-23-2020, 08:25 AM   #11
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Default Re: Fake KZE 680uf 16v?

Also notice in the eBay AD there is a date on the pictured shipping box: 27/11/2005
This matches the "5 N F (3)" UCC date code of the capacitor well (translates to: 2005 - November - 6 - (Plant 3).
So in other words I would reform these caps before use to be on the safe side.
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Old 10-23-2020, 08:37 AM   #12
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Default Re: Fake KZE 680uf 16v?

Quote:
Originally Posted by Per Hansson View Post
Also notice in the eBay AD there is a date on the pictured shipping box: 27/11/2005
This matches the "5 N F (3)" UCC date code of the capacitor well (translates to: 2005 - November - 6 - (Plant 3).
So in other words I would reform these caps before use to be on the safe side.
How would one "reform" these?
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Old 10-23-2020, 08:51 AM   #13
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Default Re: Fake KZE 680uf 16v?

Follow the link (in the word reform) in my previous post.
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Old 10-23-2020, 09:22 AM   #14
jayjr1105
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Default Re: Fake KZE 680uf 16v?

Quote:
Originally Posted by Per Hansson View Post
Follow the link (in the word reform) in my previous post.
Sweet, so basically if I have a bench supply I should be good? How many can I do at a time with a single 1K 1/4 watt resistor?

Is this acceptable? Found a beefy 1.5K resistor

Last edited by jayjr1105; 10-23-2020 at 09:48 AM..
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Old 10-23-2020, 06:42 PM   #15
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Default Re: Fake KZE 680uf 16v?

Quote:
Originally Posted by jayjr1105 View Post
How many can I do at a time with a single 1K 1/4 watt resistor?
As many as you like - at least for low voltage caps like these anyways. Now, if dealing with caps where the reform voltage has to be so high as to cause significant dissipation over the series resistor, then you have to take that into account too.

But since that's not the case here, you can do even all 25 caps at once, if you like. The only downside of using a single 1 KOhm (or 1.5 KOhm resistor in your case) is that the reforming will take longer before the caps reach full voltage. For this reason, I prefer to put no more than a few caps per resistor (or ideally one cap per resistor.) But in any case, the reforming will work.

I'd say leave them connected like that for a few hours, and they should be good to use again.

Quote:
Originally Posted by jayjr1105 View Post
Is this acceptable? Found a beefy 1.5K resistor
https://i.imgur.com/81fU7Ku.png
That will do.

Quote:
Originally Posted by Per Hansson View Post
Also notice in the eBay AD there is a date on the pictured shipping box: 27/11/2005
This matches the "5 N F (3)" UCC date code of the capacitor well (translates to: 2005 - November - 6 - (Plant 3).
So in other words I would reform these caps before use to be on the safe side.
Yup.
Looks like the seller is selling leftover production or overstock NOS capacitors.
For $7 total for 25 slightly older/NOS caps, that's not a bad deal (comes out to about 28 cents per cap.)

Last edited by momaka; 10-23-2020 at 06:43 PM..
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