Hi, Dave, Can you shed a little more light in this dark world and give us the story of why you choose Immersion Silver over, say, Immsersion Tin for BGAs and Fine-Pitch stuff. I'm interested from the Class 3 High Reliability perspective and currently use ENIG for this type of assembly. For future designs, though, I intend to move to either ImAg or ImSn, but haven't determined which one yet. TIA Peter Dave Chapman <[log in to unmask]> 10/06/2003 06:53 PM Sent by: TechNet <[log in to unmask]> Please respond to "TechNet E-Mail Forum."; Please respond to Dave Chapman To: [log in to unmask] cc: (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group) Subject: Re: [TN] LCC HASL and Immersion Silver We use Immersion Silver for all assemblies which have a BGA or less than 25 mil pitch components. Dave Chapman Manufacturing Engineer Circuit Service Inc. -----Original Message----- From: Carlr Ray [mailto:[log in to unmask]] Sent: Monday, June 09, 2003 5:32 PM To: [log in to unmask] Subject: [TN] LCC HASL and Immersion Silver Hello All, Got a question for you guys.... I have a customer who has a product in design review. We provided feedback with the following concerns. My question is what would you guys recommend for an alternative surface finish if the customer does not change parts? 1. PCB has 3 FPBGAs, 1.0 mm pitch (64 ball count) 12mm x 14mm package 2. PCB has 1 LCC, .5mm pitch (28 pins) 10mm x 10mm package 3. PCB has 4 QFPs, <.5mm pitch (28 - 204 pin count) 4. PCB has HASL finish We have recommended changing the LCC to a BGA or QFP device and changing the finish to Immersion Silver. Carl Ray Sr. Manufacturing Engineer Huntsville, AL 35807 Phone: 256-882-4800 ext. 8845 Cell: 256-990-1990 --------------------------------------------------- Technet Mail List provided as a free 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a free 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- [This e-mail is confidential and may also be privileged. If you are not the intended recipient, please delete it and notify us immediately; you should not copy or use it for any purpose, nor disclose its contents to any other person. Thank you.] --------------------------------------------------- Technet Mail List provided as a free 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------