On 1/10/02 at 9:49 PM Dexter wrote: >On Thu, 10 Jan 2002, Peter Graf wrote: > >> PGA. QFP seems obsolete, so only PGA and BGA are interesting. BGA is very >> small, but only useful for volume production. > >I'm well aware of the thermal advantages of PGA over QFP. The pins move >heat away to the PCB much more efficiently. I don't like BGA for two >reasons: prototyping is a b*tch, and the actual cost to me was $85 per >mount for the small run I did. That's why I so much dislike the dropping >of the SA-1100 (QFP) in favor of the SA-1110 (mBGA).
It is possible, even in amateur situations, but you need to design the PCB for it, and it is NOT the most efficient design, effectively, you have to put a through hole under every ball, then heat from the back. This makes the use of smaller pitched BGA very difficult. >If you have any easier projects I could cut my teeth on, I'd be happy. I'm >not anything like the level of Nasta and yourself. I'm just well equipped. >:o) See the ideas about a Q40/60 speciffic IO card... :-) Nasta
