are you guys sure it is connector? not leadframe? jk -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Jeffrey Bush Sent: Thursday, January 13, 2005 7:59 AM To: [log in to unmask] Subject: Re: [TN] FAB - Al Wire Bonding Connector fingers should be plated with harder gold - Knoop over 130. Bondable gold is either AL or AU/Ball bonding. In AL wire bonding the bond is to the under plate of NI. Some are successful at bonding the electroless NI, but most are not. Electrolytic NI seems to offer the best reliability. In this case I would call for a thin coating of soft AU (17 uinches max), as the bonding action scrubs the protective AU coating away to reach the NI layer. Thicker gold will create bonding issues for AL wire bond. Using the thinner gold may also allow you to go full body gold (for soldering also) and depending on the geometry of the circuit is could be more economical that using selective gold plating. The electrolytic NI plating should be 118 uinches min. Jeffrey Bush Director, Quality Assurance and Technical Support VERMONT CIRCUITS INCORPORATED 76 Technology Drive - POB 1890 Brattleboro, Vermont 05302 Voice: 802.257.4571.21 Fax: 802.257.0011 http://www.vtcircuits.com -----Original Message----- From: John Parsons [mailto:[log in to unmask]] Sent: Wednesday, January 12, 2005 6:32 PM To: [log in to unmask] Subject: [TN] FAB - Al Wire Bonding Greetings all, I am trying to learn something about the wire bonding process. Our customer has a part on which they spec the finish of some edge connector fingers as "Gold Plated for Wire Bonding Al Wire". As we do not provide a wire bondable gold finish in-house we have subcontracted the service. The plating service tells me that typically for Al wire bonding all that is required is a typical ENIG process (5-10u" Au over 200u" Ni). I believe that in past verbal communications with the customer they have said that an ENIG finish would not suffice and that they require 15u" of bondable gold (electroless gold or electroplated??) . What say you? Or does "it depend" :-) Regards John Parsons --------------------------------------------------- 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 -----------------------------------------------------