What packages have Moisture Sensitivity Level (MSL) numbers? Also, why does the PD8 package not have a MSL classification?
Only SMT packages such as BGAs, QFPs, etc. are classified according to their MSL level.
Non-SMT packages such as the PD8 package do not get exposed to high reflow temperatures. Since only the leads are heated during the soldering process, package delamination due to the reflow process is not a concern.