MSL = Moisture Sensitivity Level, defines and characterizes how an IC/xstr/dio/etc. package will withstand exposure to temperature and humidity over time. Specifically important for defining what process or procedure to use in assembling semiconductors to a pcb. The MSL level has become more of an issue with RoHS due to the elevated reflow temps. J-STD-020 describes this in more detail; the lower the number, the more robust the part. The Jedec std is free on the 'net. Doesn't really pertain to PCBs. Regards, Roger -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Eddie Rocha Sent: Tuesday, May 10, 2005 6:23 PM To: [log in to unmask] Subject: [TN] MSL? I'm a PCB fabricator, and I have a survey asking me several general questions related to RoHS with one being moisture sensitivity level (MSL)? What exactly are they looking for? Does this pertain to bare PCB's? -- Thanks, Eddie Rocha South Bay Circuits (480) 940-3125 x122 --------------------------------------------------- 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 -----------------------------------------------------