> On Mar 31, 2017, at 1:51 PM, allison via cctech <cct...@classiccmp.org> wrote: > > On 03/31/2017 06:32 AM, David Griffith via cctalk wrote: >>> >>> I'm down to the last few P112 boards for sale and am pondering >>> another run of them because demand is steady. One of the biggest >>> challenges for the last run was getting the QFP-packaged 100-pin >>> chips[1] in a state such that the pick-and-place robot wouldn't throw >>> a fit about slight differences in lead position. The stuffing house >>> insisted that I send them new chips. Pulls, though they looked >>> perfectly okay to me, were not acceptable. Does anyone here know >>> anything about pick-and-place robots using pulled 100-pin QFPs, >>> particularly a stuffing house that can work with such chips and not >>> screw up? >>> >>> [1] The now-obsolete super-io chips >>> >>> >> > Is this something that an experienced hand can manually do?
Yes, definitely. 100 lead PQFP is perfectly doable if the lead pitch is not insanely small. It takes a good fine tip soldering iron (mine is a Weller with a PTS tip), fine solder (preferably real, i.e., 63/37 non-PC solder). Liquid flux is a big help, as is a magnifier and bright light or modest magnification microscope. If you have to do a couple of dozen boards this gets very tedious, but for 5-ish it isn't a big deal. paul