According to the JEDEC J-STD-020 standard, MSL is divided into several levels., MSL 5–6) require strict handling procedures and carry greater risks. However, it should be noted that this standard is mainly used to help IC manufacturers to confirm and define which moisture sensitivity level (MSL) their components meet. If it is the SMT of a general EMS factory, please refer to J-STD-033 to get the moisture sensitivity level, there will be a more. Moisture sensitivity level (MSL) relates to the packaging and handling precautions for some semiconductors and is a rating that shows a device's susceptibility to damage due to absorbed moisture when subjected to reflow soldering as defined in J-STD-020. This information is displayed on Figure 2 shows examples of a box label. The older, through-hole, bulkier packages absorb moisture per volume at a slower rate than the thinner, surface-mount packages of recent times. As the storage conditions after opening the moisture-proof packing, storage temperature is specified as between 5 and 30 ℃, and humidity as within 30 to 60 % a day on average.
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