Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Lattice Orca heatsink to PCB

#22806

Lattice Orca heatsink to PCB | 19 December, 2002

Does any one have any experince with heatsinking a 240 lead QFP such as the Lattice Orca to the PCB? I have a customer who would like to know how this might be done. We are thinking of using some solder paste under the center of the part, or using some sort of a heat conductive pad under the part. I understand that the part will dissipate about 2 watts. My fear if paste is used would be in getting the part off the board if needed.

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Jon Fox

#22807

Lattice Orca heatsink to PCB | 19 December, 2002

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 »

Jon Fox

#22808

Lattice Orca heatsink to PCB | 19 December, 2002

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 »

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