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fake epcos snap-in capacitors?
fake epcos snap-in capacitors?
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Old 27th October 2020, 08:06 AM   #1
SoundFlower is offline SoundFlower
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Default fake epcos snap-in capacitors?

So recently i purchased some EPCOS capacitors online from a local store which is not an authorized distributor for TDK, but seems to have lots of different known brand items in the store and is well reviewed. When the capacitors arrived, i noticed they deviated a bit from the datasheet. they don't have the "PET" marking on the sleeve as described in the datasheet, and the pins are attached to the capacitors in a different position. I'm attaching pictures of the capacitors in case any of you are familiar with the brand and have purchased confirmed originals and know if they look like these or not. At the moment i don't have a way to measure them, and when i contacted TDK, they basically told me to look at the datasheet, which i had mentioned to them i already had.
Thank you!
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Old 27th October 2020, 08:42 AM   #2
ubergeeknz is offline ubergeeknz  New Zealand
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Which store?
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Old 27th October 2020, 08:57 AM   #3
ubergeeknz is offline ubergeeknz  New Zealand
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Also I'm not sure that it isn't genuine.

Are the terminal pins the correct distance apart (10mm from memory) - I don't recall ever having seen the letters PET on an EPCOS cap either (I buy from a reputable source, RS Components) so that may be a red herring.

I'll see if I have any pics or any in stock.
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Old 27th October 2020, 09:29 AM   #4
ubergeeknz is offline ubergeeknz  New Zealand
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Found some here, terminals are also like yours and no lettering. So I don't think there is any visual indication yours aren't genuine. Sorry, a bit hard to see in the photos as they're already installed to a terminal strip here.JPEG_20201027_212722_3838566290850526431.jpgJPEG_20201027_212853_2488603249634330300.jpg
Attachment 888033
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Old 27th October 2020, 09:51 AM   #5
SoundFlower is offline SoundFlower
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Quote:
Originally Posted by ubergeeknz View Post
Which store?
it was an online store in mercadolibre in colombia.



and thank you for the pictures, they make me feel more comfortable with the purchase, ans they do look like the terminals are attached to the capacitor in the same way as mine, i still think it's odd they don't look like the ones in the datasheet.


thank you!
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Old 27th October 2020, 09:57 AM   #6
a007udio is offline a007udio  Europe
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This one is from Mouser. Its different version, but your looks good to me.
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Old 27th October 2020, 11:25 AM   #7
JMFahey is offline JMFahey  Argentina
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Quote:
Originally Posted by SoundFlower View Post
i purchased some EPCOS capacitors online from a local store
And WHERE is "local"?

Please fill location/country data in your DIY Audio member page.

EDT: quite certain "PET" means the white strip showing negative terminal.

Which is clearly seen both in your picture AND in the datasheet image , and in the exact same angular position, on the same diametral line joining both terminal tips.
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Old 27th October 2020, 12:46 PM   #8
ferret is offline ferret  South Africa
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Quote from TDK Techinfo section 3.8.1:

" PVC insulation and PET insulation cap on terminal side
For capacitors with snap-in terminals we offer offers an insulation version with an additional PET insulation cap on the terminal side, which is placed underneath the shrinking sleeve to increase the creepage distance. This is a special design for applications with uninsulated live parts under-neath the capacitor, where higher grade of insulation is required. Dimensional details are given in the detailed specification of the corresponding capacitor series. While this design offers improved characteristics with respect to creepage distances, but it is not to be considered as functional in-sulation."

link - https://www.google.com/url?sa=t&rct=...t4FoLOvmmuEoG9
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Old 28th October 2020, 06:51 AM   #9
SoundFlower is offline SoundFlower
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Quote:
Originally Posted by a007udio View Post
This one is from Mouser. Its different version, but your looks good to me.

thank you! those pins looks like mine, and also missing the "PET" marking. i guess they just deviated from the datasheet with those details.


And regarding the other replies here, the datasheet clearly mentions the letters "PET" being printed on the sleeve, which was where my wondering came from.
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Old 28th October 2020, 10:02 AM   #10
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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PET refers to the type of plastic used in the sleeve. Nothing else.
Polyethylene Terephthalate.
It describes a hard but durable plastic that is resistant to most chemicals and reasonable heat up to 120℃
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