Page 1 of 2 1 2 LastLast
Results 1 to 10 of 15

Thread: Real or fake?

  1. #1
    Senior Member
    Join Date
    Aug 2011
    Location
    West Yorkshire, UK
    Posts
    663

    Default Real or fake?

    Following on from this thread:

    http://www.picaxeforum.co.uk/showthr...l=1#post220112

    What do you think of this?

    IMAG0675.jpg

  2. #2

    Default

    Well...it looks exactly like the ones I got from China that certainly didn't work very well..

    Note that:
    - the end pins are "half pins" - shown as "full-pins" on the Maxim datasheet
    - the two moulding marks on the top
    - the lack of a dimple by pin one
    - underneath perhaps - two moulding marks with two alphanumerics in each and no extra printing?
    - end to end 1.171 inches
    - the vertical bar on the top somewhat inboard and full width

    ...compared with my Farnell MAX7219s that look exactly like the picture at

    http://www.adafruit.com/products/453
    ..or the "illustrative picture at
    http://uk.farnell.com/maxim-integrat...p24/dp/9725245
    Note that:
    - the end pins are "full-pins"
    - no moulding marks on the top
    - a dimple by pin one (but note the Maxim data sheet doesn't show it)
    - underneath - two moulding marks with "PHILLIPINES 09" (about the time I got the one I'm looking at) embossed incredibly small on one and three letters the other, plus "MW7ANBS 0745" screen printed on the bottom
    - end to end 1.261 inches - quite visibly longer
    - the vertical bar on the top near the end and not full width

    The only definitive answer would be to get Maxim to forensically check it, to be honest

  3. #3

    Default

    I don't know.

    How much did they cost?
    Direct from Maxim they cost just over 3 quid each for 1000+ quantity.

    Just to save Eclectic's fingers...

    http://tronixstuff.files.wordpress.c...st-ch-0-41.pdf
    "Try to avoid getting one from eBay, 99.99% will be counterfeit..."

    and
    http://www.planetarduino.org/?cat=432
    "eBay seems to be full of counterfeit versions "


    Dig out the wallet and go to a proper supplier. If then they are dodgy you can do something about it.

  4. #4
    Senior Member
    Join Date
    Aug 2011
    Location
    West Yorkshire, UK
    Posts
    663

    Default

    Definitely fake then!

    They were 2 for a fiver, including p&p, from a UK eBay supplier.

    I have tested both on breadboard, and they seem to work perfectly. One has been running continuously for weeks now.

    You can understand why people buy them on eBay, if a small company like Techsupplies can sell a single picaxe 20m2 for £2.28, then £10, for what feels like should be a cheaper chip, doesn't give the impression of good value from a point of view. For another comparison, you could buy a raspberry pi for not much more than 2 max7219s from one of the big suppliers. Think of the difference in technology levels there!
    Last edited by PaulRB; 28-10-2012 at 08:34.

  5. #5
    Senior Member
    Join Date
    Jan 1970
    Location
    Florida -- USA
    Posts
    332

    Default

    The real deal ... sample from Maxim ...


    7219.JPG

  6. #6
    Senior Member
    Join Date
    Jan 1970
    Location
    Perth, Western Australia
    Posts
    3,503

    Default

    Two great photos! Now we just have to get our newbees with "can't download" problems to post pictures of the same quality.

  7. #7
    Moderator
    Join Date
    Mar 2008
    Location
    Western Australia
    Posts
    11,206

    Default

    Quote Originally Posted by inglewoodpete View Post
    Two great photos! Now we just have to get our newbees with "can't download" problems to post pictures of the same quality.
    Concur on the quality aspect.
    However, when asking someone to post a photos for the purpose of circuit fault finding I try asking for a clear photo taken straight on (perpendicular and not at an oblique) to make it easier to align a wire with a component pin/lead, make the photo clear enough so others can trace the wires from point A to point B, and with a plain background (such as on a sheet of white paper and not on the floral AXEminster carpet) where the background design/pattern can make wire tracing more difficult.
    westaust55

    Hey Hamlet, 2B OR NOT 2B = $FF

  8. #8

    Default

    Well I guess I fallen for the fakes myself.. I originally bought 3 Max7219's from Digikey.. at 13.00 each!.. I could not resist the ones on ebay.. I bought 100 of them for 50.00 shipped.. Well i wasn't very surprised when I got them that some features would not work. I have learned my lesson.. Any one need any "max 7219's" in Canada..

    Hahah

  9. #9
    Moderator
    Join Date
    Mar 2008
    Location
    Western Australia
    Posts
    11,206

    Default

    Personally I find the prices of components at Futurlec typically better than some other major component suppliers and certainly have never suffered problems with operation/functionality of components purchased from that supplier. The MAX7219 is available for AUD$8-50 / US$8-50 through both the Australian and US Futurlec websites.

    Post & Packing for a good handul of components by standard mail is $4-00 from Futurlec wheras some other component suppliers will only send by courier or other means that incurs costs of around $20 and sometimes far more.
    westaust55

    Hey Hamlet, 2B OR NOT 2B = $FF

  10. #10
    Senior Member
    Join Date
    Jan 1970
    Location
    Perth, Western Australia
    Posts
    3,503

    Default

    Perhaps you could sell them on ebay?

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •