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Re: [Amps] Ldmos heat spreaders

Subject: Re: [Amps] Ldmos heat spreaders
From: Steve Wright <>
Date: Tue, 16 Aug 2016 07:57:10 +1200
List-post: <">>
On 16/08/16 01:45,  Ian Swain <> wrote:
Hi guys I'm building my first ldmos amp with a blf188xr and can't find a
nice think slab of copper for a heat spreader

I've only found up to 6mm think would this be okay ? Or could I get away
with 2 layers to get 12 mm with heat transfer paste ?

I've bought 12mm copper bar from Steeltech on Te Tahi street.

Heat transfer is more about the minimum number of interfaces and a proper fit - than the best-best material. Which means, a machined glossy-dead-flat aluminium surface is going to work better than a poor copper surface.

You CAN get the MOSFET soldered to an aluminium heatsink - they use an ultrasonic soldering tool and the results are superlative.

There is also the option of water-cooling an alloy block. This is a little more fiddly in the cooling department, but quite a lot simpler in the mounting department.


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