Yes, MS classed, but humidity exposure tracking was not done properly. Biggest problems with mixed batches on the floor. Gaby ----- Original Message ----- From: "Ingemar Hernefjord (KC/EMW)" <[log in to unmask]> To: <[log in to unmask]> Sent: Wednesday, June 22, 2005 10:15 AM Subject: Re: [TN] Moisture sensitivity levels... > Hi Gaby, > > we do have 60% too, all mounting area is 50-60% in order to get low ESD > risk. > And still, most reels have no baking. Tantalum epoxy molded, resistors, > ceramics, > SOTs, QFPs etc are exposed to the humidity in the assembly halls. And they > are > soldered with no problems, as far as I know. Millions of them. > > Exceptions: superBGAs and very large QFPs which are MS classed by the > component > maker himself. These are stored in nitrogen cabinets or in plastic bags > with > dessicators. So, MS classed components are handled with care. > > You did not tell us what components caused big trouble. Were they MS > classed ? > > Inge > > -----Original Message----- > From: Gabriela Bogdan [mailto:[log in to unmask]] > Sent: den 21 juni 2005 16:40 > To: TechNet E-Mail Forum; Ingemar Hernefjord (KC/EMW) > Subject: Re: [TN] Moisture sensitivity levels... > > > Inge, try to work in an environment with up to 60% humidity... we are > baking > and baking again... > If we miss we are in big trouble. > Gaby > ----- Original Message ----- > From: "Ingemar Hernefjord (KC/EMW)" <[log in to unmask]> > To: <[log in to unmask]> > Sent: Tuesday, June 21, 2005 9:53 AM > Subject: Re: [TN] Moisture sensitivity levels... > > >> Steve, >> how come that you jumped high so sudden? Have you used some kind of >> humidity issue filter >> all these years...he-he..cheating. There is humidity everywhere. Mother >> nature infiltrates >> water vapour molecules everywhere she can. We learned that there is >> humidity even on inside >> of glass feedtrues, water penetrates deeply into kovar packages, there is >> water in the solder >> paste, every single "plastic" has a small amount of water on inside. >> Water >> molecules are >> universal and unavoidable. We had a period of humidity hysteria, digged >> deeply into the >> mystery of water penetration mechanisms by means of proffessors and >> doctors, had seminars, >> and the learned painted scaring scenarios about all bad things that could >> occur due to water in >> the material. We spent a lot of money on residue gas analysis and made >> lots of MIL STD >> tests and so on. The years pass and behold, a miracle: there has been no >> catastroph. Some >> few reports have been noticed, but the equipments spread all over the >> globe seem to work, >> and mounting seems to go on rather free from incidents despite there is >> water in every >> single component. So, I wonder if all anti-humidity countermeasures are >> proportional to the >> very few failures that occur due to water. >> >> My thoughts do not necesserarily represent the general opinion here, I'm >> just curious about >> the mystery of water content and others experience. Is humidity a severe >> problem today? >> Can anyone give example? >> >> (I don't include water that penetrates into packages from the surrounding >> during field use, >> but just point at built-in humidity in parts before and during assembly.) >> >> Ingemar Hernefjord >> Ericsson Microwave Systems >> >> -----Original Message----- >> From: TechNet [mailto:[log in to unmask]]On Behalf Of Stephen Gregory >> Sent: den 20 juni 2005 17:26 >> To: [log in to unmask] >> Subject: [TN] Moisture sensitivity levels... >> >> >> Good mornin' all! >> >> I hope all you Dads out there had a wonderful Fathers Day! >> >> As I posted about a week or so ago, we're getting our stockroom >> personnel to really focus on component moisture sensitivity levels. >> >> But now I'm starting to get a little confused about how components >> are generally classified with their respective MSL ratings. >> >> I've always thought that it had to do with component body size and >> thickness, >> but now I'm finding out that it doesn't necessarily. >> >> My stockroom clerk showed me an IDT SOJ28 that came in sealed with a MSL >> 3 >> rating that we now have in our dry box because the package was opened. >> >> We have some Cypress SOJ28's and SOJ24's that are on reels that are not >> in >> original packaging, so I called Cypress and asked what the MSL rating is >> for the >> two part numbers and they are a MSL 1. Cypress gave me a link to the SRAM >> Qualification Report that states that. >> >> Now my stockroom clerk brought me some Vishay tantalum caps that have >> a MSL 2a rating label on them, and they are TNTC's. This is THE FIRST >> time >> I >> have ever seen a MSL label on a tantalum capacitor. >> >> Are these ratings based on qualification reports? Or can one look at the >> size and >> thickness of the part to base how you will handle it? >> >> Kind regards, >> >> -Steve Gregory- >> Senior Process Engineer >> LaBarge Incorporated >> Tulsa, Oklahoma >> (918) 459-2285 >> (918) 459-2350 FAX >> __________________________________________________________________ >> This message may contain information that is privileged and confidential >> to >> LaBarge, Inc. It is for use only by the individual or entity named >> above. >> If you are not the intended recipient, you may not copy, use or deliver >> this message to anyone. In such event, you should destroy the message >> and >> kindly notify the sender by reply e-mail. >> >> --------------------------------------------------- >> Technet Mail List provided as a service by IPC using LISTSERV 1.8e >> To unsubscribe, send a message to [log in to unmask] with following text in >> the BODY (NOT the subject field): SIGNOFF Technet >> To temporarily halt or (re-start) delivery of Technet send e-mail to >> [log in to unmask]: SET Technet NOMAIL or (MAIL) >> To receive ONE mailing per day of all the posts: send e-mail to >> [log in to unmask]: SET Technet Digest >> Search the archives of previous posts at: >> http://listserv.ipc.org/archives >> Please visit IPC web site >> http://www.ipc.org/contentpage.asp?Pageid=4.3.16 >> for additional information, or contact Keach Sasamori at [log in to unmask] >> or >> 847-615-7100 ext.2815 >> ----------------------------------------------------- >> >> --------------------------------------------------- >> Technet Mail List provided as a service by IPC using LISTSERV 1.8e >> To unsubscribe, send a message to [log in to unmask] with following text in >> the BODY (NOT the subject field): SIGNOFF Technet >> To temporarily halt or (re-start) delivery of Technet send e-mail to >> [log in to unmask]: SET Technet NOMAIL or (MAIL) >> To receive ONE mailing per day of all the posts: send e-mail to >> [log in to unmask]: SET Technet Digest >> Search the archives of previous posts at: >> http://listserv.ipc.org/archives >> Please visit IPC web site >> http://www.ipc.org/contentpage.asp?Pageid=4.3.16 >> for additional information, or contact Keach Sasamori at [log in to unmask] >> or >> 847-615-7100 ext.2815 >> ----------------------------------------------------- > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 1.8e > To unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet > To temporarily halt or (re-start) delivery of Technet send e-mail to > [log in to unmask]: SET Technet NOMAIL or (MAIL) > To receive ONE mailing per day of all the posts: send e-mail to > [log in to unmask]: SET Technet Digest > Search the archives of previous posts at: http://listserv.ipc.org/archives > Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 > for additional information, or contact Keach Sasamori at [log in to unmask] or > 847-615-7100 ext.2815 > ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------