lyndon@cs.athabascau.ca (Lyndon Nerenberg) (05/11/91)
Does anyone know the maximum (and recommended operating) junction
temperature for the Motorola MRF492 RF transistor? I was a bit surprised
to see that the data sheet does not list this.
--
Lyndon Nerenberg VE6BBM / Computing Services / Athabasca University
atha!cs.athabascau.ca!lyndon || lyndon@cs.athabascau.ca
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The only thing open about OSF is their mouth. --Chuck Muscianomj@hpihoah.cup.hp.com (Marlin Jones) (05/14/91)
> / hpihoah:sci.electronics / lyndon@cs.athabascau.ca (Lyndon Nerenberg) / 2:44 pm May 10, 1991 / > Does anyone know the maximum (and recommended operating) junction > temperature for the Motorola MRF492 RF transistor? I was a bit surprised > to see that the data sheet does not list this. > Lyndon Nerenberg VE6BBM / Computing Services / Athabasca University My data book doesn't have this spec. either, but you can derive it. If you note Pd (at 25deg C) max = 250Watts, and combine that with the derating of 1.43 W/deg C, you'll find that Pd (max) = zero at 175 deg. C. Subtract the nominal temp (25 deg C) and you get 150 deg. C. Since its pretty hard to have a negative Pd, I'd say 150 degrees is about tops. :-) (all temps relate to the case temp.) Hope this helps, Marlin Jones _______ Marlin Jones hplabs!hpda!mj mj@hpda.hp.com "I practice safe motorcycling - I keep the rubber on the road." I don't speak for Hewlett Packard, HP doesn't speak for me.