The flash gold as mentioned by Lee below is an electrolytic process & is usually plated over nickel & not copper. If it is going to be used for SMT soldering purpose the 2microinches of flash gold is good enough, but if it is for wire bonding or contact fingers then the gold thickness is too low..... Thanks, Krishnan SANMINA-SCI Quality Assurance / NPI Manager E-mail: [log in to unmask] Phone (Off): 082-363000 Ext. 1602 Mobile: 012-8888-379 -----Original Message----- From: Anil Kher [mailto:[log in to unmask]] Sent: Monday, November 21, 2005 2:32 PM To: [log in to unmask] Subject: Re: [TN] best plated surface finish Dear lee I understand the new version of flash gold is direct immersion on copper. Is that correct. Has it been tested extensively? Anil Kher micro interconnexion pvt. ltd D3-12A, Corlim Industrial Estate Corlim, Ilhas , Goa , India 403110 tel: 91-832-2284209/337. fax 2284209/2285271 e mail: [log in to unmask] Leaders in Gold plated PCBs - selective/ cob an ISO 9001-2000 Company -----Original Message----- From: Lee parker [mailto:[log in to unmask]] Sent: Monday, November 21, 2005 1:16 AM Subject: Re: best plated surface finish Jerry Hope all is well with you. I did not mention immersion silver since it has been discussed at length in this forum and most are ware that I am a huge advocate of immersion silver going bask to 1995 when I installed the first such line in North America at the AT&T plant in Richmond. I mentioned Flash Gold because it is a relatively new coating (in its present format) and is just beginning to catch the attention of the OEMs. Best regards Lee J. Lee Parker, Ph.D. JLP Consultants LLC 804 779 3389 ----- Original Message ----- From: Gerald Gagnon<mailto:[log in to unmask]> To: [log in to unmask]<mailto:[log in to unmask]> Sent: Friday, November 18, 2005 6:28 PM Subject: Re: [TN] best plated surface finish Lee Kudos from a long time lurker...... You're absolutely correct. Many many years of OEM experience with this finish. Lots of fear over purported high cost of gold. There's a few "application" secrets but it is the ultimate surface finish. Now that the cat is out of the bag, how come you didn't mention immersion silver? Gerry Gagnon From: Lee parker <[log in to unmask]<mailto:[log in to unmask]>> Reply-To: TechNet E-Mail Forum <[log in to unmask]<mailto:[log in to unmask]>>, Lee parker <[log in to unmask]<mailto:[log in to unmask]>> To: [log in to unmask]<mailto:[log in to unmask]> Subject: Re: [TN] best plated surface finish Date: Wed, 16 Nov 2005 08:25:34 -0500 John Another option is flash gold over nickel. Both are plated inline using an electrolytic process(as opposed to ENIG). The gold thickness is roughly two micro inches. The OEMs that I am familiar with that have used this finish have reported very good results. Most of the PCB suppliers providing this process are in China. Best regards Lee J. Lee Parker, Ph.D. JLP Consultants LLC 804 779 3389 ----- Original Message ----- From: Babcock John<mailto:[log in to unmask]<mailto:[log in to unmask]>> To: [log in to unmask]<mailto:[log in to unmask]<mailto:[log in to unmask]<mailto:TechNet @IPC.ORG>> Sent: Tuesday, November 15, 2005 7:28 PM Subject: [TN] best plated surface finish If somebody wants an extra smooth plating finish using lead free plating what material would they use...and what would be the finishing process? I've heard HASL is sort of rough...and it really doesn't apply using silver solder because of the melting temps. Is ENIG (electroless nickel immersion gold) the way to go to get a smooth finish? thanks! John Babcock PCB Designer III Isothermal Systems Research (ISR) 2218 N. Molter Rd Liberty Lake, WA 99019 [log in to unmask]<mailto:[log in to unmask]<mailto:jbabcock@sprayco ol.com<mailto:[log in to unmask]>> P: (509) 241-4641 F: (509) 444-1082 This E-mail and any files transmitted with it are confidential and proprietary in nature and intended solely for the use of the individual to whom it is addressed. If you have received this E-mail in error, please send it back to the person that sent it to you. Any views or opinions presented are solely those of its author and do not necessarily represent those of Isothermal Systems Research, Inc. Unauthorized publication, use, dissemination, forwarding, printing or copying of this email and its associated attachments is strictly prohibited. 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