My company has designed a BGA device with a FR4 substrate and copper heat spreader. We have had some problems and would like to talk to someone who manufactures similar devices. From what I understand Amkor makes a similar device but I don't know of any contacts. I am looking for someone at Amkor who is involved with the design of the HPBGA . If anyone from Amkor is on this forum or if anyone knows of a contact, I would appreciate a e-mail with the contact information. Thank you. Best Regards, Michael Forrester ############################################################## 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 ##############################################################