>         When putting stuff in a sealed box (I do this quite a bit),
>         heatsink to
> the box! (doesn't work very well with a plastic box...)

But there is a marked improvement in having good thermal contact
between the internal heatsink and the plastic box.
Rth of
        Junction -> heatsink -> plastic -> air
is less than Rth of
        Junction -> heatsink -> still air -> plastic -> air

Steve.


======================================================
Steve Baldwin                Electronic Product Design
TLA Microsystems Ltd         Microcontroller Specialists
PO Box 15-680, New Lynn      http://www.tla.co.nz
Auckland, New Zealand        ph  +64 9 820-2221
email: steveb@tla.co.nz      fax +64 9 820-1929
======================================================

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