Moisture sensitivity level

Moisture sensitivity level relates to the packaging and handling precautions for some semiconductors. The MSL is an electronic standard for the time period in which a moisture sensitive device can be exposed to ambient room conditions (30 °C/85%RH at Level 1; 30 °C/60%RH at all other levels).

Increasingly, semiconductors have been manufactured in smaller sizes. Components such as thin fine-pitch devices and ball grid arrays could be damaged during SMT reflow when moisture trapped inside the component expands.

  • MSL 5A – 24 hours
  • MSL 5 – 48 hours
  • MSL 4 – 72 hours
  • MSL 3 – 168 hours
  • MSL 2A – 4 weeks
  • MSL 2 – 1 year
  • MSL 1 – Unlimited

Practical

MSL-specified parts must be baked before assembly if their exposure has exceeded the rating. Once assembled, MSL is generally no longer a factor.

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References

IPC/JEDEC J-STD-020E, Moisture/Reflow Sensitivity Classification for Nonhermetic Surface Mount Devices, December 2014.

https://electronics.stackexchange.com/questions/23044/ics-with-humidity-or-moisture-sensitivity-bake-recommendations

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