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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 beast looks like it will dissipate a lot of heat. Might be good for an electronic load.

    Definitely want a low thermal impedance to the middle of the thick side of the aluminum.

    If you can't get the flat side of your TO220 bolted to the heatsink, you may need a copper block, and some heatsink compound.

    If the fan is oriented to suck air through the fins, then the 3 Watts of fan power doesn't add to the temperature.

    If you tap the mounting hole, you could use a brass screw (3X better than steel for heat conduction)

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  • That beast looks like it will dissipate a lot of heat. Might be good for an electronic load.

    Definitely want a low thermal impedance to the middle of the thick side of the aluminum.

    If you can't get the flat side of your TO220 bolted to the heatsink, you may need a copper block, and some heatsink compound.

    If the fan is oriented to suck air through the fins, then the 3 Watts of fan power doesn't add to the temperature.

    If you tap the mounting hole, you could use a brass screw (3X better than steel for heat conduction)

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  • in reply to dougw

    Good pointers Doug, thanks.  Looks like bolting to the side is the way it should work.  My thermal calculation gives a requirement for 0.7C/W max with the simplest solution I have.  The trade off I’m making is against a more complex approach, size, layout and costs.  A smaller version of the above would suit and the price from CPC.Farnell is about 50% of the uk.farnell price which works out quite well in terms of a separate alu block and fan.