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Thu, 27 Jun 1996 07:23:42 -0700 |
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| From [log in to unmask] Thu Jun 27 08: |
57:38 1996 |
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Tadiran Telecommunications Ltd. |
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Dear Techneters
For years we have been reflow soldering TO 220 transistors to ceramic
substrates to provide good thermal dissipation . now we want to use FR4
boards . Our intention was to bend the TO220
leads and insert them in pths and reflow solder the body of the
transistor to the board on a suitable land and later wave solder the
leads . But I was told that in pcbs it is customary to use screws and
nuts or eylets instead of soldering .One explanation was that there is a
big thermal mismatch but no one seemed to know for sure .
What I would like to know if anyone has any experience in reflow
soldering TO220 s to pcbs and if anyone knows why it should not be
done.
thanking you
Eli Dallal
process engineer
Tadiran telecommunications
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