Author Topic: Fake/Real Nippon Chemi-Con  (Read 3715 times)

0 Members and 1 Guest are viewing this topic.

Offline Matt1234Topic starter

  • Newbie
  • Posts: 9
  • Country: hr
Fake/Real Nippon Chemi-Con
« on: April 29, 2020, 11:31:24 am »
Hello. I am not sure if this is the correct section to post this on, but today I ordered and received 2 Nippon Chemi-Con capacitors, 6800 uF, 25 V. Now the first thing I could notice is one of the capacitors has the lighter, brown color than the other one. One of the capacitors had a little bit weird looking text. I will include images so you guys can tell me if those are real. I also would like to know if Nippon Chemi-Con produced any of 6800 uF 25 V capacitors because I can not find any of these online. Please tell me which one is fake, and if the other one is real. If you know also tell me if the 25 V 600 uF ones exist or were produced by Nippon Chemi-Con.

The first cap which I think is fake: http://prnt.sc/s7ya3r

The second one which I am not sure about: http://prnt.sc/s7yb9j
 

Online wraper

  • Supporter
  • ****
  • Posts: 17952
  • Country: lv
Re: Fake/Real Nippon Chemi-Con
« Reply #1 on: April 29, 2020, 12:02:53 pm »
Either both of them are fake or both genuine since they have exactly the same date/lot code. Issue with text is due to clogged nozzles in printing machine, not necessarily a sign of fake. If you bought them from china on ebay or aliexpress, there is only a small chance to be genuine. You need to provide more pictures, particularly view from top and bottom (from both of them).
« Last Edit: April 29, 2020, 12:07:45 pm by wraper »
 

Offline Matt1234Topic starter

  • Newbie
  • Posts: 9
  • Country: hr
Re: Fake/Real Nippon Chemi-Con
« Reply #2 on: April 29, 2020, 12:32:00 pm »
Either both of them are fake or both genuine since they have exactly the same date/lot code. Issue with text is due to clogged nozzles in printing machine, not necessarily a sign of fake. If you bought them from china on ebay or aliexpress, there is only a small chance to be genuine. You need to provide more pictures, particularly view from top and bottom (from both of them).
Top view: http://prnt.sc/s7zh00
Bottom view: http://prnt.sc/s7zjtt

Thank you in advance!
 

Online wraper

  • Supporter
  • ****
  • Posts: 17952
  • Country: lv
Re: Fake/Real Nippon Chemi-Con
« Reply #3 on: April 29, 2020, 02:14:45 pm »
They are fake IMHO. Heat-shrink does not look consistent. On genuine NCC it's very precisely applied. You can also rip off the top plastic cover, and see vent style. Genuine cap should have it like on the picture. If it's simply cross, then it's 100% fake.

 

Offline Matt1234Topic starter

  • Newbie
  • Posts: 9
  • Country: hr
Re: Fake/Real Nippon Chemi-Con
« Reply #4 on: April 29, 2020, 02:49:28 pm »
They are fake IMHO. Heat-shrink does not look consistent. On genuine NCC it's very precisely applied. You can also rip off the top plastic cover, and see vent style. Genuine cap should have it like on the picture. If it's simply cross, then it's 100% fake.


What should I do now? Use them or?
 

Offline SiliconWizard

  • Super Contributor
  • ***
  • Posts: 15794
  • Country: fr
Re: Fake/Real Nippon Chemi-Con
« Reply #5 on: April 29, 2020, 02:51:17 pm »
Maybe make some firecrackers out of them by polarizing them in reverse... ;D
 

Offline Matt1234Topic starter

  • Newbie
  • Posts: 9
  • Country: hr
Re: Fake/Real Nippon Chemi-Con
« Reply #6 on: April 29, 2020, 02:53:14 pm »
Maybe make some firecrackers out of them by polarizing them in reverse... ;D
Well would they work good as capacitors in the circuit or not?
 

Online wraper

  • Supporter
  • ****
  • Posts: 17952
  • Country: lv
Re: Fake/Real Nippon Chemi-Con
« Reply #7 on: April 29, 2020, 03:38:09 pm »
Maybe make some firecrackers out of them by polarizing them in reverse... ;D
Well would they work good as capacitors in the circuit or not?
They will work but likely will fail prematurely.
 

Online Bud

  • Super Contributor
  • ***
  • Posts: 7275
  • Country: ca
Re: Fake/Real Nippon Chemi-Con
« Reply #8 on: April 29, 2020, 04:00:53 pm »
Did you measure the capacitance ?
Facebook-free life and Rigol-free shack.
 

Offline Matt1234Topic starter

  • Newbie
  • Posts: 9
  • Country: hr
Re: Fake/Real Nippon Chemi-Con
« Reply #9 on: April 29, 2020, 04:58:10 pm »
I did not, but should I try to check them?
 

Online Bud

  • Super Contributor
  • ***
  • Posts: 7275
  • Country: ca
Re: Fake/Real Nippon Chemi-Con
« Reply #10 on: April 29, 2020, 09:06:21 pm »
Sure, a counterfeit capacitor may be half or less of the stated value.
Facebook-free life and Rigol-free shack.
 

Online wraper

  • Supporter
  • ****
  • Posts: 17952
  • Country: lv
Re: Fake/Real Nippon Chemi-Con
« Reply #11 on: April 29, 2020, 09:23:42 pm »
Sure, a counterfeit capacitor may be half or less of the stated value.
More often they have same capacitance but lower withstanding voltage.
 

Offline SiliconWizard

  • Super Contributor
  • ***
  • Posts: 15794
  • Country: fr
Re: Fake/Real Nippon Chemi-Con
« Reply #12 on: April 29, 2020, 11:01:28 pm »
If you don't have any fancy equipment, you could sort of test them as follows:
- Connect them to a power supply through a series resistor (like 1k ohm or a bit lower), set the power supply to max rated voltage (25V);
- This will charge them and eventually get ~25V across them. Leave them like this for a week or so;
- Come back and check for any bulging or leak;
- Disconnect the power supply, connect the capacitor to an oscilloscope's probe, connect a resistor across the cap to discharge it (ideally through a switch), then put your scope to single shot and close the switch. Now observe the discharge curve, and calculate from it the approximate capacitance. Compare that to the nominal capacitance.

This won't tell you if they'll be fine after 10 years of operation, but should give you an idea of how usable they are.

And if you don't have patience for that, you can always use them as firecrackers as I suggested. It's more fun than you may think (if you're into firecrackers and things exploding in general.)
« Last Edit: April 29, 2020, 11:04:03 pm by SiliconWizard »
 
The following users thanked this post: I wanted a rude username

Offline Matt1234Topic starter

  • Newbie
  • Posts: 9
  • Country: hr
Re: Fake/Real Nippon Chemi-Con
« Reply #13 on: May 02, 2020, 05:43:35 pm »
I was also wondering if I should purchase some Nichicon capacitors for my experimental board? I am a 1st-grade electrical engineer and I want to see how capacitors work and how do they smooth things out. I do not know which Nichicon series would be good?
 

Offline james_s

  • Super Contributor
  • ***
  • Posts: 21611
  • Country: us
Re: Fake/Real Nippon Chemi-Con
« Reply #14 on: May 02, 2020, 05:54:53 pm »
It probably doesn't matter at all. If you're just experimenting then use whatever capacitors you have. The problem with cheap ones is usually long term reliability, they're fine for prototyping.
 

Online wraper

  • Supporter
  • ****
  • Posts: 17952
  • Country: lv
Re: Fake/Real Nippon Chemi-Con
« Reply #15 on: May 02, 2020, 06:05:02 pm »
I was also wondering if I should purchase some Nichicon capacitors for my experimental board? I am a 1st-grade electrical engineer and I want to see how capacitors work and how do they smooth things out. I do not know which Nichicon series would be good?
If you will continue to buy from dodgy places, avoid any 1st tier capacitor brands like chemi-con, nichicon, Rubycon, Suncon/Sanyo since chances of receiving genuine stuff are slim. It's way safer to buy some lesser brand parts.
 
The following users thanked this post: I wanted a rude username

Offline Matt1234Topic starter

  • Newbie
  • Posts: 9
  • Country: hr
Re: Fake/Real Nippon Chemi-Con
« Reply #16 on: May 02, 2020, 07:00:55 pm »
To be honest, I was really dissapointed that those were fakes. I ordered 1x Nippon Chemicon 50 V 6800 uF, 2x Nippon Chemicon 25 V 6800 uF, and 6x Samxson 16 V 1000 uF. Instead of Samxson they gave me Elite capacitor, and instead of the real Nippon Chemicons they gave me fake ones... It is my local store and I am dissapointed. Next time I was planning to order from tme.eu. I was ordering from electronic-center.hr
 

Online wraper

  • Supporter
  • ****
  • Posts: 17952
  • Country: lv
Re: Fake/Real Nippon Chemi-Con
« Reply #17 on: May 02, 2020, 07:08:34 pm »
Elite are good enough capacitors.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf