Moisture Sensitivity Levels (MSL) Classifications Modern technology demands smaller electronic components, which have poorer moisture resistance and struggle with high-temperature reflow soldering. IPC/JEDEC defined Moisture Sensitivity Levels (MSL) to assess component moisture resistance. Higher MSL levels indicate greater moisture sensitivity. MSL testing involves soak requirements and electrical testing to ensure functionality under specified conditions. Standards include J-STD-020 for IC manufacturers and J-STD-033 for general EMS factories.
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