Solder whiskers are more likely at low pressure and low temp, but they happen with lead-free solder (more slowly and at a lower frequency) under standard condit

Solder whiskers are more likely at low pressure and low temp, but they happen with lead-free solder (more slowly and at a lower frequency) under standard conditions as well [1]. Given the number of connections on any given PCB, and that we have no way to prevent or predict whiskers, the failure rate over reasonable time-frames of any ROHS PCBA converges to 100%. [1] https://nepp.nasa.gov/whisker/reference/tech_papers/2005-dadonna-nuclear-reactor-shutdown.pdf https://nepp.nasa.gov/whisker/reference/tech_papers/2005-dad...