Originally posted by apc
I've killed plenty of stuff with static. But I work with microelectronics all day, so it happens if you're not wearing your strap during the
There's special anti-static linoleum-like flooring you can get, as well as wear antistatic shoes. But simplest and cheapest route is to just wear a
Quote for truth. Johnsky, I have rarely obliterated parts with decent internal protection such as most logic and micros, but I have done it. More,
smaller parts with low gate capacitance and no protection structures will bite it in the blink of an eye. I toasted a couple dozen FETs one morning
when I thought I had my strap plugged in and didn't have my VSE3000 running.
I don't know about using a metallic floor. We've never done that, and I personally would NOT do that. The reason why is, if you are in contact with
the floor and it's a metallic connection at 'green ground', and you touch a connection at line potential, you could easily injure or kill yourself.
What we have here is a mix.
On the share lab floor, we use ESD conductive tile laid down over concrete with conductive adhesive. In the adhesive are copper foil strips about a
yard apart that go to a copper ground ring in the baseboards, there's a single point earth ground. The tiles are conductive but are in the range of
50-100K, it dissipates static really quickly but not to the point you'd be electrocuted if you got across the line by accident.
In the SCIF there's a solid sheet of really thick copper foil with tile on top that's part of the room shielding. But there's still the tile
between you and a metallic ground, so the impedance isn't so low.
We wear foot loops (a couple of guys have static shoes), and I usually go barefoot unless someone's visiting, because I hate foot loops, and have a
habit of putting my feet on the chair anyway. If you don't have a foot on the tile the tile doesn't do the job. Which is why we have other stuff.
The lab bench tops have a dissipative mat which is grounded, we have wrist strap jacks every few feet on the bench, and we have my personal favorite,
a neutral ion generator over each bench. (peeks) They're Chapman VSE3000s. I love, love, love my 3000. Because I forget to plug in the wrist loop at
times. The VSE throws a cloud of mixed positive and negative ions. If you're carrying a charge, the opposite charge ions will come for you and take
it away. It also keeps the flux out of your lungs.
You can almost do without the straps if the 3000 is blowing on you, and sometimes I do. If it's a really pricey part, though, Tom doesn't play. Some
of the stuff we work with is several thousand a chip, it doesn't do to be careless.