moisture sensitivity level (components) (MSL)
The Moisture Sensitivity Level (MSL) is a factor that refers to the humidity and the period of time that semiconductor components or chips may be exposed to during storage, transport and assembly.
The MSL value is a type of classification used to make a statement about the moisture exposure of electronic components and encapsulated integrated circuits.
The value itself is given as a numerical value together with the abbreviation MSL, for example MSL-2. There are six numerical MSL values from which the exposure duration, the room temperature and the room humidity to which the electronic assemblies may be exposed are indicated.