what should be the moisture level rating
The MSL rating is given after product qualification and determined by the materials used in its IC. packaging and assembly process is based on a constant 30Â°C and constant relative humidity. In practice, the absorption of moisture into an IC package is proportional to temperature and relative humidity. Therefore, floor life can generally be increased with exposure to temperatures lower than 30Â°C or lower. humidity levels than 60% RH.