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Counterfeit parts warning.

Discussion in 'Misc Electronics' started by Andre, Feb 4, 2004.

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  1. Andre

    Andre Guest

    Be aware that there is a good possibility that the TIP122 devices you
    buy are counterfeit! I just got a bad batch that were not even 122's,
    they were PNP darlingtons with internal resistor and diode.

    The suspect devices have markings which are unusually large compared
    to a genuine ST part, and come off with acetone. You may see a very
    faint set of markings just above the fake ones; it appears that the
    original markings have been abraded off. Possibly "R6403"

    Also the suspect devices are marked as follows,

    7 91

    A "real" device has the markings embossed whereas these appear
    "blurred" as you would expect if they had been screen printed.

    The other giveaway is that the top corners are straight whereas on a
    genuine device these corners are chamfered.

  2. john

    john Guest

    Andre Where did you buy them from ?

  3. El Meda

    El Meda Guest

    Thanks for the warning. I've found several counterfeit parts myself,
    they can be seen at:

    The page is written in spanish, but it has lots of pictures.
  4. It amazes me that someone would bother doing this with such a cheap part...
  5. Andre

    Andre Guest

    Well, its not that cheap, the genuine devices are about 60p each. Plus
    they seem to be used a lot in a number of consumer products such as
    plasma lamps, also some fluorescent lanterns to name a few.


  6. shows several sources somewhat cheaper, including SGS-Thomson from Future at 20
    cents in volume.
  7. part...

    Why would you say such a thing? When a distributor sells tape reels of
    thousands of these for several thousand dollars, there is _big_money_ to
    be made. Very big money.
  8. ...but surely there must be more expensive parts that would be worth faking - how much margin can
    there be in a 20 cent part ?
  9. CWatters

    CWatters Guest

    But it's not a single 20 cent part. They will be faking expensive reels of
  10. It's not how many cents, it's how many _percent_. If the distrib buys a
    couple hundred thousand parts at 5 cents and sells them for 25 cents,
    that's a decent year's wage for someone! Forty thousand dollars!
  11. Zak

    Zak Guest

    Well.. they probably want the parts to work a bit, so they work when
    under light test, or in the majority of applications.

    This is probably harder for more complex or more critical components.

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