Question, What IPC standard defines the solder paste thickness on a pad? What IPC standard covers AOI and X-ray inspection equipment? Thanks. Jose R. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Happy Holden Sent: Thursday, January 05, 2006 11:07 AM To: [log in to unmask] Subject: Re: [TN] Gold over Tin Franklin, I suspect a 'misspelling' or 'mistake'. They may have meant Ni but put down Sn, or maybe Sn/Ni (that is the tin-nickel alloy used in the Bay Area in the 70's). 50 uinch of Au would make this tin-rich solder joint very unreliable as well as expensive. Happy Holden Westwood Associates Franklin Asbell <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 01/05/2006 01:57 PM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to Franklin Asbell <[log in to unmask]> To [log in to unmask] cc Subject [TN] Gold over Tin Received an unusual request for quote with a fab note callout for the following. 1. Plate 200/50 microinches SnAu (very hard) Now I read that as 200 microinches of tin plating, followed by 50 microinches of Gold and thought to myself..huhhhh!!! I contacted the buyer and he agreed it was quite unusual but they indeed need gold over tin. The buyer could not explain why, so I thought I would see if others have performed this process, and why such uncommonly mixed coatings??? Franklin --------------------------------------------------- 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 -----------------------------------------------------