Help me verify the date code on this electrolytic? Counterfeits?

[cvanc]

1986, right?  Thanks...

(also, that's pretty ratty silkscreening, do you think these might be counterfeit?)

[thm_w]

Where did you buy it from, was it advertised as new or NOS?

It looks like a newer style than an 86 capacitor.

[tooki]

Not likely to be 1986. I suspect it’s the 86th day of 2018 (March 27), the 86th day of 2008 (March 26), or the 86th day of 1998 (March 26) if it’s exceptionally old stock.

I think the code is the last digit of the year, followed by the day number. E.g. 2018 on day 086 =>8086

[fzabkar]

Could this be the part number -- ECOS2AP102AA ?

Large Can Aluminum Electrolytic Capacitors (Year 2000 issue):
http://www.farnell.com/datasheets/18866.pdf

Panasonic TS-UP series aluminium electrolytic capacitors:
https://media.digikey.com/pdf/Data%20Sheets/Panasonic%20Capacitors%20PDFs/TS-UP_Rev2010.pdf

This notice states that the package style was changed in 2013:
https://media.digikey.com/pdf/PCNs/Panasonic/PG25.05.07.2013_Materials.pdf

"Panasonic is going to make its entire Snap-In Al. Electrolytic lineup REACH compliant. All Snap-In Lytic capacitors are required to follow this REACH standard on or before January 1st, 2015.

Effective Date: Product produced by Panasonic on and after October 1, 2013.

The Sleeve material on these capacitors will change from PVC (Polyvinyl chloride) to PET(Polyethylene terephthalate). Please see before and after picture below."


Edit: I agree that the silkscreening looks counterfeit.

Edit #2:  Could the zero be an oh (for October)??

http://web.archive.org/web/20131228072117/http://www.panasonic.com/industrial/components/pdf/dc103.pdf

[cvanc]

Thanks everyone.

These are not new, they are pulls from a product with an overall manufacture date of 1996.  Which is why the date code confuses me - it seems all possible interpretations are really divergent from the known date the product was assembled.

What I *don't* know for sure is has anyone been in here before me and swapped in some old parts at these locations.  The board doesn't appear to have been reworked before but sometimes you can't be sure.

Oh well, I'm replacing them in any case.

[tooki]

Oh my. I think it'd be unlikely that the cap was made in 1988 and not used until 1996, so it's either a replacement, or uses a date code system I can't find a decoding key to. (None of the date code formats I found in any Panasonic documents would work with the code on this cap.)

[tooki]

Edit #2:  Could the zero be an oh (for October)??

In theory, yes. (I saw all those documents in my own research, too.) But the rest of the date could doesn't match any of those schemas, in that the O would have to be followed by another letter, or a roman numeral, but not arabic numerals.