.5 oz start and than plate up is common unless you have a need for more than 1oz copper on your outer layers. James Hofer Director of Operations Accurate Circuit Engineering 3019 S. Kilson Dr. Santa Ana Ca. 92707-4202 714-546-2162 work 714-473-6127 cell [log in to unmask] ----- Original Message ----- From: "Cal Driscoll" <[log in to unmask]> To: <[log in to unmask]> Sent: Wednesday, July 28, 2004 5:19 AM Subject: [TN] 1oz Copper vs. .5 oz Copper > Hi All- > > One of our PCB designers came to us with a recommendation from our Bare > Board fab house- > We typically use 1 oz copper and the fab house is asking us to use .5 oz > copper and build it up to 1 oz. > > Since I am not a designer, so I would like some input from TechNet on this > type of practice. > > Facts: > 99% of our boards are used in Telecommunications products > Most of our boards have QFP's in the 12 mil range > Typically most of our boards have Gold pads/finish > > > Thanks, > cal > > --------------------------------------------------- > 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 847-509-9700 ext.5315 > ----------------------------------------------------- > --------------------------------------------------- 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 847-509-9700 ext.5315 -----------------------------------------------------