Today I *carefully* shot an ISD1416 speech chip with freezer spray, and like the sad-departed PIC, it was fine as it dropped into hypothermia. BAD news. It hung up its clogs as it WARMED up, just like it's departed friend, the PIC. Did both die from thermal shock, perhaps the connections from the die to the outer package being unable to keep up with the thermal expansion of the extremities? Stuart Meier Wyndham Associates -----Original Message----- From: Kevin Fisk To: PICLIST@MITVMA.MIT.EDU Date: 29 April 1999 18:28 Subject: Re: My PIC is dead. 29.4.99 RIP >Thermal shock could have killed it. > >Stuart Meier wrote: >> >> Sadly, my IND TEMP SMT 12c508 died this after noon, when I shot it with >> Freeze 75 thermal spray. This stuff claims to go down to -49degC, but the >> PIC was sitting in the sunshine when it got hit, so I expected it not to go >> lower than -40. I was very sad it DIED - I thought it might freeze until >> warmed up a bit, but now certified dead and in the WPB. >> >> Unfortunately I don't have a -40 thermometer. >> >> Should it have died, or just frozen up until warmed up or reset. ANyone any >> idea on PIC response outside certified range? >> >> Stuart Meier >