05-09-2012 05:47 AM
Recently,we has procured 3 lots of devices.Device is XC95288-15HQ208I.
We suspect that the three parts are not genuine Xilinx.
Is there something strange about the device markings?
Solved! Go to Solution.
05-09-2012 06:12 AM
The third part is missing the serifs on the "I" for the device temperature grade. I seem
to recall another recent thread where this was mentioned (I believe that thread referred to
the serifs as "bars").
The problem with counterfeit parts is that the counterfeiters are usually quite good at
imitating part markings. Usually you need to electrically test the parts to tell if they
are good. Even then, you may have parts that have been re-marked for a different
speed and/or temperature grade, which may make them fail in your system.
The only way to avoid this is to buy parts from a franchised Xilinx distributor.
For parts that are past end-of-life, there are testing services which perfom a variety
of functions including electrical tests, X-Ray examination, and die examination
(the last being destructive). For parts that are still available through normal distribution
it is much better to avoid this.
05-09-2012 07:33 AM
One more related query please - can you look for the LOT code?
Why would Xilinx want to publish -- in a public forum -- advice for counterfeiters (e.g. which font mistakes to correct, which lot codes to avoid, etc.) ?
Neither Gabor nor I are Xilinx employees, as far as I know.
-- Bob Elkind
README for newbies is here: http://forums.xilinx.com/t5/New-Users-Forum/README-first-Help-for-new-users/td-p/219369
1. Read the manual or user guide. Have you read the manual? Can you find the manual?
2. Search the forums (and search the web) for similar topics.
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4. Do not post a new topic or question on someone else's thread, start a new thread!
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6 "It does not work" is not a question which can be answered. Provide useful details (with webpage, datasheet links, please).
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05-11-2012 04:21 AM
A valid lot code doesn't prove much. You would think package remarkers would at least use a valid existing lot code, but they apparently sometimes don't. There are other issues such as remarked temp, speed grade, device - even manufacturer. Not to mention outright fakes - possible issues with ESD damage, poor rework, etc.
There are multiple threads here on counterfeit or reworked parts.
The simple answer is to buy your devices from an authorized distributor.
http://www.xilinx.com/support/answers/33557.htm (XC4000 - Are the devices real or fake? Are the devices counterfeit?)
07-23-2012 02:38 AM