Electronics > Projects, Designs, and Technical Stuff

Heat sink for SMD TO-268?

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iXod:
I want to use these SMD IGBTs and isolate the collectors from each other. These devices can each dissipate 160W according to the datasheet:

https://www.mouser.com/ProductDetail/IXYS/IXBT12N300HV?qs=gQEZvVdd8Gu6zNE3ZZzUfg%3D%3D

But how to get rid of that heat? The recommended SMD sinks

https://www.mouser.com/Thermal-Management/Heat-Sinks/_/N-5gg0Z1yzvvqx?P=1z0z7ptZ1y8egdpZ1y9fv1vZ1yzvkz7Z1yztn61

don't look like they're going to handle that.

How does one design to dissipate huge heat from such a small package?

Thanks.

TimNJ:
I would use some sort of spring-loaded heatsink assembly, sort of how CPUs or GPUs are often cooled. Or, use your chassis as a heatsink, with a similar mounting strategy.

TimNJ:
Although, I do wonder how effective heatsinking to the plastic part of the chip really is.

wraper:

--- Quote from: iXod on June 20, 2020, 11:12:02 pm ---These devices can each dissipate 160W according to the datasheet:

--- End quote ---
Dream about that, not even close under realistic conditions. Even if they could be mounted directly on a heatsink, it still would be wildly unrealistic. Look at the conditions when they can dissipate this much.

--- Quote ---TC = 25°C 160 W
--- End quote ---

Phoenix:
What you can do with smd like this is heavily via stitch through the pcb and mount a heatsink on the other side with silpad. Good luck getting anywhere near 160W though.

For a more expensive option mount it on an alumina substrate and put that on a heatsink.

If you want to dissipate serious power for some reason it's easier to look at to247 or even modules.

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