Hello K.K., Motorola's Semiconductor technical data, AN1231 for Plastic Ball Grid Array, Table 2, provides a mold compound thermoconductivity value of 0.67 W/m (superscript: .)(superscript: o)K. Best Regards, Shean To: [log in to unmask] cc: (bcc: Shean Dalton/ElectrovertUS/Cookson) Subject: Re: [TN] IC package plastic molding compound In a message dated 11/01/1999 1:04:36 PM Central Standard Time, [log in to unmask] writes: Hi K.K., In Phil Marcoux's book; Fine Pitch Surface Mount Technology, where he discusses solder reflow, he has a diagram that shows the thermal conductivities for typical materials used in printed circuit assembly (copper, fr4, ceramics, etc.) and he lists plastic as 0.2w/m K ?. -Steve Gregory- << K.K.- Didn't see any replies, so I'll quote a number that was handy- 16 x 10^-4 cal/cm-sec deg C taken fom page 81, Table 8.1, "Typical Characteristics of Molding Compound Properties", from the Text "Plastic Encapsulated Microelectronics", Ed. by M. Pecht, L. Nguyen, and E. Hakim, TK7874.P428 1995, ISBN 0-471-30625-8, John Wiley & Sons. Michael Alderete ------------------------------ Date: Fri, 29 Oct 1999 15:39:23 -0700 From: KK Chin <[log in to unmask]> Subject: IC package plastic molding compound Can anyone tell me what's the bulk thermal conductivity of the plastic molding compound in an IC package, in the unit of W/M-K? Thanks! K.K. Chin Artesyn Technologies Fremont, CA. >> ############################################################## 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 Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################