EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: peps1 on September 22, 2017, 05:48:24 pm
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Hey guys, planing on testing out some dip soldering and have just got my solder in, so checked the data sheet for the melting point, and I see a higher temp called Minimum junction temp, what is the "Min junction temp"?
Google search seems to just come up with a lot of PDF's mainly about BJTs and MOFETS
its the 60/40Pellets on this datasheet attached.
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I'd guess it's the temperature they want you to get the junction of the things you're soldering upto. When when you solder, you're forming intermetallic compounds, (I.e. a tin-copper, and lead-copper compound) at the interface between the two, so just melting the solder isn't enough, it has to be able to form the IMC layer to an appropriate thicknesses as it wets the surfaces.
Heating copperclad on a hot plate with solder paste on it, I've seen the solder bead up momentarily before wetting the copper. I figured the flux needed time to make stuff happen, but it could have been the fact that IMCs hadn't formed because the temperature was too low.
Hopefully someone with real metallurgy experience can give some insight.