Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
???
09/26/06 15:36
Read: times


 		 #125089 - Yes, but...
Responding to: ???'s previous message
Jan said:
- tamperproof (tamper-evident) label/sticker (a very thin foil, usually silverish so I assume that's some plastic/alu sandwith; plus a rather strong glue; it breaks and tears very easily when you try to remove it)

- a drop of black (filled) epoxy on top of the IC or over the whole IC

Yes, these ideas are well suited.

But what I'm interested in, is a methode where a person actually needs to destroy something to get information about the chip. With your methode he can still remove the sticker or epoxy glue and tell, it happened somehow by accident: "I'm so sorry, I put the osci probe to the package, and 'hopp' the epoxy glue broke!" Or: "I'm so sorry, but I had the board in the sun, and 'hopp' the sticker came off.

When removing the paint by a suited solvent, on the other hand, he finally needs to crack the chip, to find out what chip it is (was...).

Kai

List of 45 messages in thread
TopicAuthorDate
How to remove the stamp from chip package?            01/01/70 00:00      
   paint the chip            01/01/70 00:00      
      Can be removed?            01/01/70 00:00      
         I am afraid...            01/01/70 00:00      
            more ideas            01/01/70 00:00      
               Yes, but...            01/01/70 00:00      
                  let me elaborate on the idea...            01/01/70 00:00      
            If its a ceramic package            01/01/70 00:00      
               Thanks            01/01/70 00:00      
            Yes..            01/01/70 00:00      
               epoxy            01/01/70 00:00      
                  Thanks!            01/01/70 00:00      
                     ESD and bead blasting            01/01/70 00:00      
                        Chips are already soldered onto the board            01/01/70 00:00      
                           Not BGA            01/01/70 00:00      
                              Thanks, Joseph!            01/01/70 00:00      
                  Formic acid doesn't work for me!            01/01/70 00:00      
               epoxy or novalac            01/01/70 00:00      
                  Yes, high tech epoxy...            01/01/70 00:00      
         some paint works            01/01/70 00:00      
            Yes, that's what I'm looking for!            01/01/70 00:00      
   Stamp?            01/01/70 00:00      
      marking            01/01/70 00:00      
      The printing on the package, the marking            01/01/70 00:00      
         Sand paper, cloth emery sheet            01/01/70 00:00      
            Thanks            01/01/70 00:00      
               How about very fine grit emery cloth damp or wet?            01/01/70 00:00      
                  Yes, this is a good idea!            01/01/70 00:00      
                     Methy-Ethyl Ketone Peroxide?            01/01/70 00:00      
                        Plastic            01/01/70 00:00      
                        MEKP            01/01/70 00:00      
   I remember that situation ...            01/01/70 00:00      
      abrasive and ESD            01/01/70 00:00      
      back in the old days ...            01/01/70 00:00      
         I may be being stupid but...            01/01/70 00:00      
            there are reasons ...            01/01/70 00:00      
               Always a pleasure            01/01/70 00:00      
         While in memory lane...            01/01/70 00:00      
            We did that at IBM, too.            01/01/70 00:00      
            Special companies do it            01/01/70 00:00      
               You can get stock numbers on anything            01/01/70 00:00      
   Use a Dremel            01/01/70 00:00      
      It's important they don't notice it!            01/01/70 00:00      
         It didn't blister            01/01/70 00:00      
      I will have a look at it            01/01/70 00:00      

Back to Subject List