Victor, You can find 23 papers and presentation on microvias in the "Technical Resources" area of the Web Site: www.westwoodpcb.com. Happy Holden "Victor G. Hernandez" <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 03/14/2005 01:40 PM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to [log in to unmask] To [log in to unmask] cc Subject Re: [TN] Microvias & plating Fellow techNett, Can some one share articles and/or studies conducted on Microvias & Plating? Victor, -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Kerry Bode Sent: Wednesday, March 09, 2005 12:04 PM To: [log in to unmask] Subject: Re: [TN] Microvias & plating Hello, The micro-via with dimples is fairly common and is deployed in many high reliability products today. The micro-via should be of a size that does not create a void or out gassing condition during assembly. I have seen studies that if the via dimple is greater than .006 in diameter it becomes a concern during assembly. Solder paste typically will fill in the dimple. Japan PWB fabricators have developed a method to plate the vias closed, however it's costly. -----Original Message----- From: Michaloski, Denise [mailto:[log in to unmask]] Sent: Wednesday, March 09, 2005 11:22 AM To: [log in to unmask] Subject: [TN] Microvias & plating Does anyone call out the microvias to be plated flush? (This particular board is immersion gold) Our in house assembly is asking for this because they do not like the dimples left on SMT pads from the microvias (especially on BGA pads). Anyone who uses microvias, please let me know how you deal with your microvias. TIA Denise Michaloski, C.I.D. Windermere ITS 443-716-2510 [log in to unmask] --------------------------------------------------- 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 -----------------------------------------------------