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- Path: sparky!uunet!pipex!warwick!uknet!cam-eng!cmh
- From: cmh@eng.cam.ac.uk (C.M. Hicks)
- Newsgroups: sci.electronics
- Subject: Re: Handling CMOS
- Message-ID: <1992Dec14.120707.13760@eng.cam.ac.uk>
- Date: 14 Dec 92 12:07:07 GMT
- References: <Dec10.210537.30773@yuma.ACNS.ColoState.EDU> <1992Dec11.211003.22990@pts1.pts.mot.com>
- Sender: cmh@eng.cam.ac.uk (C.M. Hicks)
- Organization: cam.eng
- Lines: 43
- Nntp-Posting-Host: tw611.eng.cam.ac.uk
-
- more_da@pts4.pts.mot.com (DAN MORERA) writes:
-
- >In article 30773@yuma.ACNS.ColoState.EDU, gw214790@LANCE.ColoState.Edu (Galen Watts) writes:
- >>If you use sockets, don't take the chips out of the package until you install
- >>them.
- >>The way I install CMOS chips is in the bathroom. Take the circuit board, all
- >>the tools you might need and the chips into the b-room and close the door.
- >>Run the shower on HOT for a few minutes, until the mirror fogs over. Leave the
- >>water running (maybe turn it down a little), touch the board and the package the
- >>IC's are in together, open the package and insert the IC as quickly as possible.
- >>The idea is to use the high humidity to dissipate any static charges.
- >>Frequently touch the board and chip packages together before removing the chips
- >>just in case. If you need to remove an IC, do the bathroom stuff, and put the
- >>chip into a sheet of aluminum foil so the foil touches all the pins.
- >>
- >>I've done this for a few years and have NEVER blown a CMOS IC inserting it.
- >>Blowing it in the circuit is another matter I won't go into.
- >>
-
- >This isn't a flame or anything, but are you serious? Boy, am I glad I live in
- >sunny and humid South Florida, because I would hate to take a shower everytime
- >I play around with CMOS parts. :-)
-
- >I guess a simple ground strap doesn't suffice up there, huh?
-
- I've never blown a CMOS chip either. I work on a bare chipboard bench (no
- melamine or varnish etc) and am simply careful to touch the packaging and
- board simultaneously while handling the chip. All this bathroom stuff seems
- bizarre - do you get contact corrosion because of water trapped in the
- sockets :-? BTW, conductive foam is much more usable than foil.
-
- Christopher
-
- --
- ==============================================================================
- Christopher Hicks | If it doesn't fit...
- cmh@uk.ac.cam.eng | ...you need a bigger hammer.
- ==============================================================================
- --
- ==============================================================================
- Christopher Hicks | If it doesn't fit...
- cmh@uk.ac.cam.eng | ...you need a bigger hammer.
- ==============================================================================
-