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Heatsink usage

Andrew J

Specifically, this heatsink: Fischer Elektronik LA6/150 12VFischer Elektronik LA6/150 12V.  I'm trying to work out how that might be used so I'm putting it out there to see if anyone has used something like it or have ideas.  From what I can tell, it 'seems' to be used with a removable bottom plate for 'flat' semiconductors but I'm thinking that something like, say, a TO220 package could be attached to the side with a self-tapper.  A bit like they show with their LAM series heatsinks (PDF, sorry for the non-Farnell link!): here they show them with transistors 'clipped' to the side on the K version so I'd assume that on the non-K version, one would just screw it on.  What think you lot?

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  • That seems to be a sort of "channel" or "tunnel" heatsink as I like to call them. They're quite popular in test equipment that need to dissipate quite a bit of heat while remaining compact.

     

    You can see a similar unit inside my Rohde & Schwarz NGM202 where it uses one channel heatsink with semiconductors and a temperature sensor mounted on both sides of the channel. They just tap the holes in and bolt/clip them in.

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    I'm not sure you would mount anything on the flat metal plate on the bottom in the picture - it looks quite thin and not well thermally coupled. Instead, if you had a flat package which was board mounted, perhaps turning the heatsink upside down and using the thick metal surface (top in the picture) is a better idea.

     

    I suspect the removable metal plate may just be to modify the airflow - in the case the plate is in, air must flow all the way through the heatsink to the rear, otherwise the air may "leak" out and contribute to cooling of surrounding components. But perhaps the main reason would be that the removable plate should be mounted oriented upwards so you can remove it to clean the fins during maintenance!

     

    - Gough

  • in reply to Gough Lui

    That’s really useful Gough, thanks.  I never thought about the plate being for cleaning but that makes sense.  The pictures look like the fan vents out of the side of the enclosure?  Does it have a fan or clearance at the opposite end?

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