Re: Soldering bypass caps to QFP possible?
- From: Ben Jackson <ben@xxxxxxx>
- Date: Fri, 25 Jan 2008 18:17:38 -0600
On 2008-01-25, Joerg <notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote:
Is it reasonably possible to solder a bypass cap to adjacent pins on a
0.5mm pitch QFP chip or would that just open up a can of worms?
I've reworked commercial FPGA prototype boards with QFP packages by
soldering 30ga wire to pins (including adjacent pins) but it's a pain.
If you just need bypassing you are probably better off straddling smt
caps between nearby vias (package size chosen to match your vias!). It's
not necessary to put them on the pins -- most QFP designs I've seen have
the bypassing on the opposite side of the board anyway. And keep in
mind that the bondout wire from the die to the pin is going to be longer
than the distance to your cap...
--
Ben Jackson AD7GD
<ben@xxxxxxx>
http://www.ben.com/
.
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