Shirley - I would recommend you classify the board as a SMT Board. The tighter requirements will assist you with solder paste printing and component placement. If you have any SMT parts on a board, you should go with the tighter requirements. Ed/ Ed Valentine Electronics Manufacturing Solutions 8612 Mourning Dove Road, Raleigh, NC 27615 Phone: (919) 270-5145, Fax: (919) 847-9971 Email: [log in to unmask] Website: http://www.ems-consulting.com ----- Original Message ----- From: Shirley Xiao <[log in to unmask]> To: <[log in to unmask]> Sent: Wednesday, May 17, 2000 10:26 PM Subject: [TN] SMT/PTH classification > Techneters: > The IPC specification for PCB warpage is 0.7% for > SMT board and 1.5% for PTH board. My question is how > to classify SMT board and PTH board. For example a > board have hundreds PTH but with several SMD with > minimum pitch of 0.75mm. > > Shirley Xiao > > __________________________________________________ > Do You Yahoo!? > Send instant messages & get email alerts with Yahoo! Messenger. > http://im.yahoo.com/ > > ############################################################## > TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c > ############################################################## > To subscribe/unsubscribe, send a message to [log in to unmask] with following text in > the body: > To subscribe: SUBSCRIBE TECHNET <your full name> > To unsubscribe: SIGNOFF TECHNET > ############################################################## > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional > information. > If you need assistance - 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 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################