I am working on a device that I want to work outdoors far up north (e.g. on a farm), maybe down to -40C. I read a lot about through-hole circuit boards being more resistant to environmental stress than surface mounts, including heat, but no mentions of cold. I am guessing that
- because of the larger distance between parts they would be more resistant to condensate that might form and also
- because through-hole parts have "legs" or pins, those act like springs when the board expands-contracts during the temperature fluctuations
Are those valid guesses? Are there any other advantages/disadvantages I am missing?
SM is cheaper than THM so I am trying to make a list of pros and cons before I decide whether to choose one or the other.