XPost: sci.electronics.components   
   From: bill.sloman@ieee.org   
      
   On 1/12/2025 12:47 pm, David Lesher wrote:   
   > I'm curious about lifetime of IC's from the 1980's.   
   >   
   > Has there been any published work on degradation   
   > of stored IC's of that era?   
      
   None that I know of. I had a Philips fax machine that stopped working in   
   the 1990's shortly  after the guarantee had expired, and it looked to me   
   as if there had been some field driven ion migration in the silicon   
   oxide inside some of the gates of of the CMOS IC that monitored the   
   key-board and managed the the liquid crystal display.   
      
   Surface mount components do have to be stored in a low humidity   
   environment - the plastic packaging can soak up enough water from a   
   domestic atmosphere to crack up during flow soldering.   
      
   Sticking them into a vacuum desiccator for a few days before soldering   
   can be a good idea.   
      
   --   
   Bill Sloman, Sydney   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)