Maxim 7219 - Real and Fake compared

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i came across nice pictures.

it's dutch site translated comments.
link: http://www.circuitsonline.net/forum/view/85013/7
pictures robinf. removed chip housing sulphuric acid. ouch!  :smiley-fat:


real / fake maxim 7219 compared:

upper: real maxim 7219
lower: ebay maxim 7219




real maxim:

this circuit inside upper chip on first photo.
the layout seems same on maxim datasheet page 14:


the chip 2mm x 2mm (0.0078" x 0.0078")


indeed, chip seems real one:




fake maxim 7219:
this photo of inside of lower chip on first photo:


this chip 1mm x 1mm (0.0039" x 0.0039"). seems more modern production technology?
no text on chip surface, scissor image...



comments picaxe thread pointed out paulrb:
http://www.picaxeforum.co.uk/showthread.php?22481-real-or-fake

note that:
- end pins "half pins" - shown "full-pins" on maxim datasheet
- 2 moulding marks on top
- lack of dimple pin one
- underneath perhaps - 2 moulding marks 2 alphanumerics in each , no printing?
- end end 1.171 inches
- vertical bar on top inboard , full width

yep, mine fakers sure.  except ones got directly maxim, "real" photos.  though, , must stress this, "fakes" work me.

i have sop "max7219s".  information in determining if these real or not?  typical auction:

http://www.ebay.com/itm/50pcs-maxim-max7219cwg-max7219-sop-24-led-display-driver-ic-8dig-24soic-/310723512133

almost fake, think.

thanks photos, great.



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