On Tue, 13 Jun 2006 12:50:48 +0200, leon_heller
<
leon.heller@...> wrote:
> I've just made another PCB with a footprint for a Hirose 50 way DF12
> connector with 0.5 mm lead spacing, it turned out very well. The DF12
> pads are 0.38x1.00 mm.
> The PCB is double-sided with a continuous ground plane on one side.
> I used my usual photo-etch technique with artwork printed onto JetStar
> film using an Epson 870 printer.
> I've uploaded a pic of part of the PCB to Photos, in my 'Leon's' folder.
> Leon
I've done 0.5 with toner transfer and it worked well also. The pitch is
not yet the problem, but getting the signals away from pads in the middle
like BGA you can't do that without THP. Also it can be _very_ hard to
observe the suggested track length with the new high speed ICs where a
single via is like a huge inductor.
ST