Re: Capacitor with 105 degree celsius ?

"Lord Garth" <LGarth@xxxxxxxxxxxx> wrote in message news:<23B5e.8908$c76.1847@xxxxxxxxxxxxxxxxxxxxxxxxxx>...
> "John Fields" <jfields@xxxxxxxxxxxxxxxxxxxxx> wrote in message
> news:gjkd5112fk5577upjghkl1v8oe08n38p5p@xxxxxxxxxx
> > On 8 Apr 2005 07:09:46 -0700, mowhoong@xxxxxxxxxxx (mowhoong) wrote:
> >
> > >Capacitor with a range of 105 Celsius & life 8000 hours? I am curious to
> know
> > >who will design a circuit put under such high temp. & only last for eight
> thousend
> > >hours, other component like plastic will also deform due to high temp.Do
> you think
> > >it make sense ? Can any person know the reason. Thanks.
> >
> > ---
> > _Only_ 8000 hours? Downhole equipment is routinely expected to not
> > only survive, but to work in environments in excess of 200°C, so that
> > 2000 hours gets eaten up pretty quickly.
> >
> > --
> > John Fields
> > Professional Circuit Designer
>
> Besides the heat of drilling, what is the temperature at say 4000 feet?

Hi John.
What kind of Downhole equipment is? you will expect the solder tin melt when it
reach 187 C. do you mean the electronic circuit board in the downhole ?
.

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