Nano Power Inverter - Roll Your Own Style

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Joined: 09/08/2007
Location: Australia
Posts: 4406
Posted: 02:10am 17 May 2019      

Without the copper, all the heat concentrates into a very small area of some fairly thin aluminium. With a copper plate, the heat is spread over a far wider area into the aluminium.

[quote]How much of a change does this have on the life/performance of the MOSFET? [/quote]

Probably not much, unless you are really pushing the absolute limits of junction temperature. I suppose it depends on your appetite for risk.
Cheers,  Tony.