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How to spot a counterfeit Capacitor
- Thread starter uniserver
- Start date
I get mine from ebay and I use a simple multimeter to check a few before installing.
Either way you have no way of knowing if what you purchased were factory seconds or customer rejects. You would make more money quicker selling 10,000 pieces of rejects to Mouser then trying to sell them a dozen at a time on ebay.
Either way you have no way of knowing if what you purchased were factory seconds or customer rejects. You would make more money quicker selling 10,000 pieces of rejects to Mouser then trying to sell them a dozen at a time on ebay.
What do you think of the cheap own brand caps some sites sell? I sometimes buy "multicomp" branded caps from farnell / CPC, there cheap and seem to be decent quality. Normally i buy name brand caps (panasonic / nichicon / rubycon) but sometimes I get multicomp branded ones when price forces my hand. As of yet i haven't had any problems with them.
wilykat - That's called "Derating a Cap" where if you put in a higher voltage into a cap, it's supposed run at a higher capacitance. Where this theory this came from it's not true, I never seen it work and I've been working with electronics since 1969. But that example you posted is an extreme within its own classification!
Uniserver - Since you have said in past posts (about Power Supplies cap) that you find the Nichicon Caps leak in every case, I stay away from them. I buy my parts from Newark/Element 14 or DigiKey. I noticed that Mouser's prices have gone up on a lot of things, not just in the caps. But I do need to go to Mouser for specific Caps that the others do not carry or only sell in Bulk - like the 2200µf cap in the SI Power Supply, Newark/Element 14 only sells them in a "roll of 500" @ $1.30 a cap! I only need 2 caps and I don't have $600 to buy 500 of them!
Uniserver - Since you have said in past posts (about Power Supplies cap) that you find the Nichicon Caps leak in every case, I stay away from them. I buy my parts from Newark/Element 14 or DigiKey. I noticed that Mouser's prices have gone up on a lot of things, not just in the caps. But I do need to go to Mouser for specific Caps that the others do not carry or only sell in Bulk - like the 2200µf cap in the SI Power Supply, Newark/Element 14 only sells them in a "roll of 500" @ $1.30 a cap! I only need 2 caps and I don't have $600 to buy 500 of them!
I absolutely refuse to purchase radial lytic caps online from any supplier. Ebay, mouser, digikey...whatever. The only exception if I'm really desperate is from Topcat over on Badcaps.net but his prices are a little steep. Unless you are way out in the middle of Buttsland you can get them at your local electronics shop and you can at least visually inspect them before you purchase.
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Unfortunately CelGen, many electronics stores in NYC have closed down and Radio Shack is a running bad joke. Any place that does sell electronic parts would only sell a pack of 100 random caps/resistors/etc for $40 and chances are the cap you need is not in the group. So my only option is to buy online.
Luckily, i live closely to a couple electronics warehouses. MCM electronics and parts-express/dayton audio.
But, I just order everything i need from digikey/mouser anyway.
But, I just order everything i need from digikey/mouser anyway.
If a local store had them, they'd likely be as old as the caps I would be looking to replace! 
Yeah max, i think if you were to order cheap caps from china, I think the best thing would be to buy their brand.
If its a name brand and its cheap, then its probably counterfit. I would like to say that making an electrolytic cap is probably not rocket sicence.
for instance.
http://www.bdent.com/catalogsearch/result/?q=2200uf+25v
these guys are selling SunCon. also Lots of the others too.
And Mouser has been selling these EPCOS caps. In some situations they are the lowest price
i looked them up and come to find out TDK had just bought them.
i really like TDK's MLCC Ceramic caps.
So I bought a reel of 1000 47uf/16v/6.3x5.4mm SMD last spring
haven't really used much of them though, because i am have been offering free SMT Ceramic caps
for the stock price.
I would like to try some of the Chinese branded caps, just to see, out of interest if they are up to standard.
but don't really have the time to mess around right now.
for instance:
put them through some extreme testing.
Elffin:
What i noticed was the ELNA ( LONG LIFE ) caps as the ones always leaking, at least in the TDK PSU's
but james is right when he said this:
https://68kmla.org/forums/index.php?/topic/18815-caps-lc-tdk-power-supply-fix-for-pizza-box-macs/
James1095
If its a name brand and its cheap, then its probably counterfit. I would like to say that making an electrolytic cap is probably not rocket sicence.
for instance.
http://www.bdent.com/catalogsearch/result/?q=2200uf+25v
these guys are selling SunCon. also Lots of the others too.
And Mouser has been selling these EPCOS caps. In some situations they are the lowest price
i looked them up and come to find out TDK had just bought them.
i really like TDK's MLCC Ceramic caps.
So I bought a reel of 1000 47uf/16v/6.3x5.4mm SMD last spring
haven't really used much of them though, because i am have been offering free SMT Ceramic caps
for the stock price.
I would like to try some of the Chinese branded caps, just to see, out of interest if they are up to standard.
but don't really have the time to mess around right now.
for instance:
it would be nice to have some input on these things… i would like to set up a durability test bench … and wire them up and
put them through some extreme testing.
Elffin:
What i noticed was the ELNA ( LONG LIFE ) caps as the ones always leaking, at least in the TDK PSU's
but james is right when he said this:
https://68kmla.org/forums/index.php?/topic/18815-caps-lc-tdk-power-supply-fix-for-pizza-box-macs/
James1095
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Its worse when the caps do blow!
Since I buy so-called name-brand caps, I bought a few SMD/SMT ceramics to test a recapping with and the LCIIIs I got I did with Black Tantalums and Ceramics. It now how as interesting look to it. X^D
But in the case of the SMD/SMT-MLCC Ceramic Caps, there is no label to distinguish them by name-brand or rating unless I look at the package from which they came from. They were Kemet caps, which are a bit more expensive than the other companies, but I believe worth it. But there were no name-brand or rating written anywhere on the caps. I could see here counterfeiting to be more rampant as there are no labels to distinguish any of them.
Since I buy so-called name-brand caps, I bought a few SMD/SMT ceramics to test a recapping with and the LCIIIs I got I did with Black Tantalums and Ceramics. It now how as interesting look to it. X^D
But in the case of the SMD/SMT-MLCC Ceramic Caps, there is no label to distinguish them by name-brand or rating unless I look at the package from which they came from. They were Kemet caps, which are a bit more expensive than the other companies, but I believe worth it. But there were no name-brand or rating written anywhere on the caps. I could see here counterfeiting to be more rampant as there are no labels to distinguish any of them.
I guess sometimes you need to have some good fashion trust.
Really, i guess it comes back to service.
Just like there are many people out there that buy the 3 year extended plan, with their new electronic item.
So just incase that manufacture used some bad component that happens to die with in 6 to 12 months, they
would be absolutely covered.
If you ended up buying a botched part from Mouser or Digi-Key.
They both have phones you can call, and Customer Service people that will bend over backwards for paying customers.
Giving you free replacements, Money back… Free shipping whatever it takes to keep you happy.
I guess even ebay has that buyers protection, They just extended the protection from 60 days to 90 days,
just for plenty of time to get things in from china.
Aliexpress has 30 days till after you receive the item.
In my case these 2200uf 16v counterfeits did come from aliexpress, they were like 14.99 for 200 caps, including shipping.
I basically bought them just to re assure my self that buying the absolute cheapest on the internet is bad.
Could have received my 14.99 back, but 30 days had already passed before i even opened the package.
Was not planning on using them, even if they were not counterfeit, I'm a big believer in you get what you pay for.
So I tossed most of the whole box in the trash, and just kept a few in my drawer, to keep as a specimen.
Really, i guess it comes back to service.
Just like there are many people out there that buy the 3 year extended plan, with their new electronic item.
So just incase that manufacture used some bad component that happens to die with in 6 to 12 months, they
would be absolutely covered.
If you ended up buying a botched part from Mouser or Digi-Key.
They both have phones you can call, and Customer Service people that will bend over backwards for paying customers.
Giving you free replacements, Money back… Free shipping whatever it takes to keep you happy.
I guess even ebay has that buyers protection, They just extended the protection from 60 days to 90 days,
just for plenty of time to get things in from china.
Aliexpress has 30 days till after you receive the item.
In my case these 2200uf 16v counterfeits did come from aliexpress, they were like 14.99 for 200 caps, including shipping.
I basically bought them just to re assure my self that buying the absolute cheapest on the internet is bad.
Could have received my 14.99 back, but 30 days had already passed before i even opened the package.
Was not planning on using them, even if they were not counterfeit, I'm a big believer in you get what you pay for.
So I tossed most of the whole box in the trash, and just kept a few in my drawer, to keep as a specimen.
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I accidently the LC III with the Tantalum/Ceramics on it yesterday. I turned it on to check out a few floppies that morning before getting a crying phone call from my ex about not having food in the house (she is loaded with issues, which is why she is an ex and not a current significant other). So after the sob story, I went out to see her. If you know NYC and its 5 boroughs that make it up, I live in North East Manhattan, she currently lives out in the outskirts of Queens near an LIRR (Long Island Rail Road) train station - it takes a train and a bus to get to her new place. I went to go see what is going on and get her some food, forgetting that the LC III was still on.
8 Hours later I return home and took a nap on the living room couch, it lasted another 2 hours. Woke up, took care of personal business in the boys room and went into my room. I found the LC was still on (No Screen Saver - Oh Well!). The PSU was quite warm but not hot to the touch and the board was cool and still operational! It passed a "Burn-In" test! LOL!
Now that is quality I could trust. If I would have returned with the house on fire, I'm sure the NYFD would told me the source of the flames was LC III that was on all that time. Talk about Paranoid thinking.
8 Hours later I return home and took a nap on the living room couch, it lasted another 2 hours. Woke up, took care of personal business in the boys room and went into my room. I found the LC was still on (No Screen Saver - Oh Well!). The PSU was quite warm but not hot to the touch and the board was cool and still operational! It passed a "Burn-In" test! LOL!
Now that is quality I could trust. If I would have returned with the house on fire, I'm sure the NYFD would told me the source of the flames was LC III that was on all that time. Talk about Paranoid thinking.
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speaking house on fire, and installing tantilums in the LC-III.
did you happen to remember that C22 has an error on the silk screen?
witch is probably ok with Stock Electrolytic… or even ceramics. but Not tantilums… they can catch fire and burn.
https://www.thinkclassic.org/viewtopic.php?id=97
did you happen to remember that C22 has an error on the silk screen?
witch is probably ok with Stock Electrolytic… or even ceramics. but Not tantilums… they can catch fire and burn.
https://www.thinkclassic.org/viewtopic.php?id=97
Great thread, hear, and the pictures are a great illustration to backup the material.
I always buy caps for my Mac Re-Cap jobs from Mouser. Usually Kemet for tantalums, and always Nichicon or Panasonic for electrolytic.
I have considered ebay, buy I just don't trust it for the Macs. I recap the Macs to preserve a piece of history, and restore them to working order. Chancing a crap capacitor or a fake off ebay just isn't worth it to me. If I chance it on ebay, and it turns out to be a crap shoot, I would end up placing another order at Mouser or Digikey in the end, and spending more money than I would have doing it right the first time, and no frustration of getting cheated, in the end.
I always buy caps for my Mac Re-Cap jobs from Mouser. Usually Kemet for tantalums, and always Nichicon or Panasonic for electrolytic.
I have considered ebay, buy I just don't trust it for the Macs. I recap the Macs to preserve a piece of history, and restore them to working order. Chancing a crap capacitor or a fake off ebay just isn't worth it to me. If I chance it on ebay, and it turns out to be a crap shoot, I would end up placing another order at Mouser or Digikey in the end, and spending more money than I would have doing it right the first time, and no frustration of getting cheated, in the end.
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