[sdiy] Static Damage to ICs

[>>>marjan<<<]

8-O

If I've read this somewhere else I wouldn't belive it.
What's the deal here? Is it the charachteristic of the tape
or is it charged during unrolling the tape?


>   3M came to our plant to demo their
> >anti static equipment.  For their demo, they would put a JFET into an
> >instrument to measure the gate leakage current.  I can't remember the FET,
> 
> >but the bias current was something like 1 pico amp.  They would take the part
> 
> >and put it into a "pink" anti static bag (this was the product they were
> >competing against).  The would then take a roll of scotch tape, and pull off
> 
> >a strip of it about 1 foot away from the pink bag.  They would then take the
> 
> >FET back out of the bag and put it into the test instrument, and the Gate
> >leakage would be about 1 nano amp.  The same experiment using the 3M metal
> 
> >coated bag would result in no increase in the gate leakage.  Mind you, nobody
> 
> >ever touched the fets physically to ZAP them.
> 
> We have a 3M static meter at work here, measures to 20KV. It relies on an internal
> radioactive source to function, fun stuff. To check it's calibration you do
> the following:
> 
> "measure the voltage on a piece of Scotch Brand #810 magic mending tape. Pull
> 8" to 10" of tape from the roll and hold in the air so the strip of tape hangs
> down from the hand. The reading should be at least 5000 volts positive at a
> distance of two inches"


-- 



marjan


me    : Marjan Urekar
e-mail: urekar.m at eunet.yu
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