moisture-sensitive components: referred to as moisture-sensitive components, English referred to as MSD (Moisture-sensitive device), that is, vulnerable to environmental temperature and humidity and static impact of a class of electronic components.
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According to the standard,MSD mainly refers to Non-Hermetic SMD devices. Including plastic packaging, other permeable polymer packaging (epoxy, silicone, etc.). General ics, chips, electrolytic capacitors, leds, etc., are non-airtight SMD devices.