During the process of designing PCBA, do you know which humidity-sensitive grade the components you need to use belong to?
In fact, during the PCBA design and assembly process, we all need to know that each IC has storage conditions, time and temperature restrictions.
For ICs that have not been put into SMT for a period of time after opening or have been stored for a long time, the HIC(Humidity Indicator Card) inside the IC changes color after being opened. Baking is required before putting them into SMT.
The baking time requirements for ics with different Moisture sensitivity levels (MSL:Moisture SensitivityLevel) vary.
The sensitivity levels of IC are classified into eight grades: Grade 1, Grade 2, Grade 2a, Grade 3, Grade 4, Grade 5, Grade 5a, and Grade 6. The service life of Grade 1 and Grade 2 components after opening is over one year, while Grade 6 components must be baked before use.
The baking conditions for IC with sensitivity levels of 2a to 5a are generally required as follows:
In fact, prolonged baking is not good for ICs, so it is not assumed that all ICs should be baked by default, we only do when it is necessary.
