Counterfeit parts warning.

[Andre]

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

 

[john]

Andre Where did you buy them from ?

kpi
--
"Watch the return E-Mail addy its false"
"Andre" <testing_h@yahoo.com> wrote in message
news:2c2cf14c.0402041242.7a7987b6@posting.google.com...

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

 

[El Meda]

testing_h@yahoo.com (Andre) wrote:

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

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

http://transfal.tripod.com/

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

---
Ing. Remberto Gomez-Meda <gomerem@hotmail.com>
http://ingemeda.tripod.com/
INGE - Ingenieria Electronica.
Puerto Vallarta, Jalisco, Mexico.