One common practice, depending on what is on the other side of the PCB and how much heat you need to draw away from the part, is to manufacture a pseudo-heatsink into the board itself. It looks like a large tinned pad but has a dense array of vias for the movement of air and heat out the other side of the board. If you don't want to have to respin the PCB try some basic heat sink designs from iERC or AAVID Thermalloy. Both have a design for just about any kind of device. Another opion would be a thermal adhesive (not sure about the actual application) but my Com-Kyl rep keeps leaving me with new sample all the time and this is one. Looks like a big shiny sticker that you put under a chip or on a part of your PCB to help draw heat away from the device and or PCB. That one will take some research and most likely more cost.
reply »