Counterfeit parts warning.

Hi, 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 TIP122

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.

-A

Reply to
Andre
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Andre Where did you buy them from ?

kpi

Reply to
john

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

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The page is written in spanish, but it has lots of pictures.

--
Ing. Remberto Gomez-Meda 
http://ingemeda.tripod.com/
INGE - Ingenieria Electronica.
Puerto Vallarta, Jalisco, Mexico.
Reply to
El Meda

It amazes me that someone would bother doing this with such a cheap part...

Reply to
Mike Harrison

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.

-A

Reply to
Andre

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

Reply to
Mike Harrison
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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.

Reply to
Watson A.Name - "Watt Sun, th

..but surely there must be more expensive parts that would be worth faking - how much margin can there be in a 20 cent part ?

Reply to
Mike Harrison

faking - how much margin can

But it's not a single 20 cent part. They will be faking expensive reels of parts.

Reply to
CWatters

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faking - how much margin can

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!

Reply to
Watson A.Name - "Watt Sun, th

how much margin can

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.

Thoms

Reply to
Zak

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