n a message dated 02/02/2000 1:29:36 PM Central Standard Time, [log in to unmask] writes: << Fellow technetter's Can anyone tell me which package (BGA or PGA) has better electrical characteristics from the other and why. thanks Bill >> Hi Bill! Go to: http://www.smtnet.com/bookstore/publications/0speckdo1/s1.html and you'll find a pretty good cross section of information about the aspects of BGA technology. Below is a table that lists various aspects in comparing other packages with each other. This table came from that page: PGA CBGA QFP ------------------------------------------------------------------------------ --------------------------------------- Size 43.5 x 43.5 mm 21 x 21mm 26 x 26 mm I/Os 196 324 256 Type I/O Pins Pads Leads Pitch 0.394mm 1.0mm 0.4mm Signal-Signal Cap 1.43pF 0.40pF -- Signal-GND Cap 6.76pF 1.85pF 1.78pF Signal Inductance 8.57nH 3.26nH 20.31nH Ground Inductance --- 0.76nH --- ____________________________________________________________________ Table 1-2. BGA Package Performance Comparisons Source: IBM Also in John Lau's book; "Ball Grid Array Technology" chapter 7 page 220, there is a statement; "For electrical management, BGA packages have much better electrical performance than PQFP or PGA. The inherent small package size of BGA not only gives shorter package delay, but also gives short package-to-package delay at the system level." Hope you find this useful... -Steve Gregory- ############################################################## 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 ##############################################################