'Getting a PIC really HOT!! or What will make a PIC'
I received one of our units back from a customer of ours abd the pic was
completly destroyed. The location where the die is/was was all burned
and such. It is suspected of being put in a mircowave oven.
The PIC is a SMT version of the 16C57 and is operated from a 4-cell
ni-cad battery pack, all mounted inside a high-impact ABS plastic case.
The unit is a handheld device and designed for being bumped and banged
I will get a picture of it, and post it to my website.
This is a manufactured device, made is batches of 100's.
This is the only one that has been returned in this condition.
Batteries have been installed wrong, but the unit just stops working
when the batteries fail. Others have had screwdrivers, pens and other
things put throught them, but the PIC has yet to explode.
I'll be able to get a picture of the device next week. Both a working
unit and the one that has been destroyed.
|Alan Nickerson Wrote:
> I received one of our units back from a customer of ours abd the pic
> completly destroyed. The location where the die is/was was all burned
> and such. It is suspected of being put in a mircowave oven.
To give you an alternate view on that failure mode, I have an old and
used digital panel meter from a batch that I picked up at a hamfest some
years back. There's a 7474 on the front PCB with the LEDs. As I was
testing them out I noticed that this one would work fine for about five
minutes or so and then call it quits. The die area of the 7474 gets so
hot that it actually blows a bubble on the plastic package! Let it cool
down and it will work again. It seems odd that it would work at all with
some sort of defect that would get the chip that hot. Too much trouble
to get the thing apart to find the problem. I haven't blown a bubble
with a PIC, but I have had one (due to an oops of a wiring error) get
hot enough that I managed to burn my finger on it (badly). After I
corrected my oops and it cooled down, I continued to use it as my
development PIC without any problems.
Well The PIC in this case go so hot that the case is missing around the
die area. You can actually see the the die or whats left of it.
I forgot to take the board to work so I could get a picture of it. I'll
try and do it tomorrow.
Richterkessing, Frank H (GEA, 055132) wrote:
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