Si juctions are formed at temps of 1000C or more. Thermal failure is more likely to be due to alloying of metal contact areas. I used to lifetest transistors up to 360C for 20 hours with power applied!! and anything up to 6 months at 200C. You cant get those temps with plastic encalsulations though glass (double dummet) diodes will stand 300C easily
Alan G3NYK --- On Mon, 26/3/12, David C. Partridge <[email protected]> wrote: > From: David C. Partridge <[email protected]> > Subject: Re: [time-nuts] Distribution amp - Use a video amp unit ? > To: "'Discussion of precise time and frequency measurement'" > <[email protected]> > Date: Monday, 26 March, 2012, 14:02 > An Si junction can tolerate pretty > high temperatures for a short while, or even a long while - > Bob Pease reported having had a component sat on the hot end > of a soldering iron for about 24 hours and still working > afterwards ... > > I've never seen a description of how they make those glass > cased parts - I guess speed is important. > > Dave > -----Original Message----- > From: [email protected] > [mailto:[email protected]] > On Behalf Of Peter Gottlieb > Sent: 26 March 2012 13:50 > To: [email protected] > Subject: Re: [time-nuts] Distribution amp - Use a video amp > unit ? > > how are glass cased > diodes made? Wouldn't the > temperatures needed to form the glass and > seal it to the leads destroy the silicon > junction being put inside? > Peter > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
