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From: jmuchow@SPAMMENOTcamlight.com (John Muchow)
Subject: Re: Question about linear derating factor for MOSFETs
Date: Mon, 11 Nov 2002 22:33:18 GMT
Organization: MindSpring Enterprises
References: <email@example.com> <3DCF50E9.CF58D143@rica.net> <3DCF5916.50B32FE1@rica.net> <firstname.lastname@example.org> <3DCFC3E9.260A976A@rica.net>
X-Server-Date: 11 Nov 2002 22:38:38 GMT
X-Newsreader: Forte Free Agent 1.21/32.243
I was half-joking about buying the freon or mercury, but now that I've
thought about it for a while, I would love to try this out for the
unit that would be staying in my lab. But I think the enclosure would
take more time to work out than just adding a couple more devices and
spreading the load around.
I am soooo tempted though...
Thanks for the info!
>>>>>>> OK, so am I buying a few pounds of freon or mercury?
>>>I would try something that was volatile (so it would boil at ambient
>>>under only a slight vacuum) and a good electrical insulator (rules out
>>>mercury). Trichloroethylene (or trichloroethane) might be good, but
>>>I am not sure how stable the epoxy in the device package will last if
>>>submerged in it indefinitely. Pure alcohol might also work. It is a
>>>material compatibility problem. If the liquid has a high heat of
>>>vaporization, that is a bonus. As heat from the device evaporates the
>>>liquid, the pressure rises incrementally, forcing vapor to condense
>>>on all surfaces exposed to the vapor that are the slightest bit cooler
>>>than the surface of the device, and heat energy is deposited there.
>>>Amazing amounts of heat can be carried away from very small surfaces
>>>with little temperature rise (if the vapor container has enough area
>>>and external heat removal means). On the order of kilowatts per
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