Yes, I have similar suspicions about "conductive foam" and oxidation, although this may depend on the manufacturer of the foam? I prefer to store chips in tubes, but protected from dust too. Also, I don't like the soft plastic "end stoppers" for the tubes, these tend to leak plasticiser after "long" periods of storage.
Joe. > -----Original Message----- > From: Friedel Bruening [SMTP:[EMAIL PROTECTED]] > Sent: Thursday, November 14, 2002 5:03 AM > To: Multiple recipients of list CHIPDIR-L > Subject: Re: Logic Families > > Hi Syd, > from the experience I have, I can tell you that it isn�t such a good idea > using foam for > storage over a longer period, IC pin�s tend to oxide, I wounder if it was > for the foam or > simply an effect of time, climate and the pin�s material. But I still have > > the idea it was > because of the foam. > > So far I can tell, I have never had CMOS damaged from statics as far as I > can tell, to me, and I have > used quite a bit, CMOS seemed always pretty rugged, they don�t die easy, > or > say you > do really stupid things to them. I really never worried to much about > storage or handling. > We use to rap them in kitchen type aluminium foil, that cheep and easy, > and > pin�s get bent > this or any other way. > > Cheers > > Friedel > > > At 11:09 a.m. 12/11/02 -0800, you wrote: > >Greetings List: > > > >I have some questions about logic families I hope some of you gurus can > help > >me with. I have been reorganizing our stock of logic chips for the last > >couple of days and realized I was not really sure about some assumptions > I > >have made over the years. > > > >Static Sensitivity - I think DTL, RTL, and TTL chips are relatively > >insensitive to static, so can they be safely stored loose in plastic > parts > >cabinet drawers? I assume 4000 series and 74Cxx CMOS chips are very > static > >sensitive and should be inserted in conductive foam in the plastic > drawers. > >But what about the Schottky families like 74Sxx, 74LSxx, and 74ALSxx, are > >they static sensitive? And what about the newer CMOS families like > 74HCxx, > >74ACT, etc.; are they as static sensitive as the original CMOS families? > > > >Compatibility - I work on several circuits that use 74Cxx chips > (actually, > >the 54Cxx mil spec versions), and a few of them are hard to find now, > >especially the 74C221. Some of these circuits are running the 74Cxx > chips > >at 5 volts, and some at 10 to 15 volts. Am I correct that the 74HCxx > chips > >will probably replace the 74Cxx chips only in the 5 volt applications? > Are > >there any logic families other than the 4000 series and the 74Cxx CMOS > chips > >that can be powered with 10-15 volts? > > > >Thanks in advance. Sorry for so many questions. > > > >Syd H. Levine > >AnaLog Services, Inc. > >Phone: 270-276-5671 > >Telefax: 270-276-5588 > >E-mail: [EMAIL PROTECTED] > >URL: www.logwell.com > > > > > >-- > >Author: Syd Levine \(AnaLog\) > > INET: [EMAIL PROTECTED] > > > >Fat City Network Services -- 858-538-5051 http://www.fatcity.com > >San Diego, California -- Mailing list and web hosting services > >--------------------------------------------------------------------- > >To REMOVE yourself from this mailing list, send an E-Mail message > >to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > >the message BODY, include a line containing: UNSUB CHIPDIR-L > >(or the name of mailing list you want to be removed from). You may > >also send the HELP command for other information (like subscribing). > > -- > Author: Friedel Bruening > INET: [EMAIL PROTECTED] > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB CHIPDIR-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). -- Author: da Silva, Joe INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
