----- Original Message -----
From: Steve Baldwin <steve@TLA.CO.NZ>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, February 19, 2002 3:00 PM
Subject: Re: [EE] TO-220 heatsinking


> >         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
>
or, like in a proto of mine once:
 Junction -> Heatsink -> Plastic --melting (sublimating?) ->air
  becomes:
 Junction -> Heatsink -> hole ->air

:')

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