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Thu, 1 Mar 2018 08:13:00 +0100 |
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Hello Technetters.
I have a question on a limitation of operating temperature of SnPb solder joints in aerospace equipment's.
The ESA (European Space Agency) specifications, concerning soldering of components SMT or THT, tell " The mounting and supporting of components, terminals and conductors applies to assemblies designed to operate within the temperature limits of -55°C to +85°C".
The issue is the +85°C.
We suspect that it is due to aging of solder joints (Law of Arrhenius?) but, today, nobody manages to give an explanation to this limit which seems historic. Somebody has an idea about this topic ? Why +85°C and not +90°C or +100°C?
Thanks for your advices.
Best regards,
CANTAGALLO Luigi
Technology Engineer
Thales Alenia Space Belgium
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