🚀 go-pugleaf

In article <THEN.92Aug19211705@vipunen.hut.fi>, then@vipunen.hut.fi (Tomi  H Engdahl) writes:
|> 
|> In article <1992Aug18.151205.2809787@locus.com> dana@locus.com (Dana H. Myers) writes:
|> 
|> >I don't have a reference handy, but I recall that solder melts at a lower
|> >temp than 400 C. I mean, 400C is 750 deg F. 
|> 
|> My reference says that the solder melts in temperatures between 188C and 
|> 220C. For eaxample Multicore 60/40 melts at 188C. Multcore Savbit melts at
|> 215C.
|> 
|> >I can imagine the 486-50 running at 100-120 C, but not 400 C, even briefly.
|> 
|> I think that over 200C is too high for silicon chips.
 

A collegue of mine has suffered from a bipolar device that disppitated 7W and
thus detached itself from the board by melting the solder...

Check out a paper called Packaging a 150W Bipolar ECL Microprocessor by William
R Hamburgen amd John S Fitch from DEC's WRL if you want to find out about the
bleeding edge of this subject.

(for DEC WRL reports, email to WRL-Techreports@decwrl.dec.com with the word
'help' in the subject line)

                                Adrian