Before revision: '' MSL 6 – Mandatory Bake before use 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 References IPC/JEDEC J-STD-020E, Moisture/Reflow Sensitivity Classification for Nonhermetic Surface Mount Devices, December 2014.
After revision: MSL 6 – Mandatory Bake before use 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 References IPC/JEDEC J-STD-020E, Moisture/Reflow Sensitivity Classification for Nonhermetic Surface Mount Devices, December 2014.