Adam Seychell <
a_seychell@...> writes:
> Use glass cloth under the PCB to avoid local hot spots.
Some other ideas, depending on what you're trying to accomplish:
1. Aluminum plate distributes the heat pretty evenly.
2. Coins. Put a coin on the hotplate that's about the same size as
the chip (a dime for 0.5mm QFN-32), and only that part of the board
heats up.
I've used the coin trick to remove and re-install QFNs. I think part
of the trick is to put a few dots of solder paste near the chip so you
know when it gets to melting temperature.