I have no trouble with 10 mil traces with TT. You might want to just
try it out. 12 mil pads, 8 mil seperation could do it. I suspect
aligning the package will be a bit tricky but bet its doable. solder
wick is your friend here, unless you have a reflow oven.
--- In
Homebrew_PCBs@yahoogroups.com, Stefan Trethan
<stefan_trethan@g...> wrote:
> Hi,
>
>
> I bought a few ICs at ebay, very cheap, but some have tqfp case....
>
> the pin to pin spacing is 20mil i believe, it are 100 pins.
>
> Do you think this is possible with TT?
>
> It are xilinx cplds..
>
> I have some with 160pins (xc95216) but they have a wider spacing,
they
> don't trouble
> me much but the 20 mil is really a bit low.....
>
> i would really dislike to buy some photoresist boards and my
printer
> doesn't make transparencys
> that are good...
>
>
>
> ST
>
>
> (p.s. i managed to get my nylon screws yesterday... had to make
them from
> a old plastic clothes hanger. no way to buy plastic screws with
hexagonal
> head..... will report soon about the horizontal
> pcb etch holder)