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McDry Ultra-Low Humidity Storage Cabinets

IC Package Storage Specified by IPC/JEDEC

Dry Box Storage Guideline as Recommended by IPC/JEDEC J-STD 033B.1

(Handling, Packing, Shipping and Use of Moisture/Reflow Sensitive Mount Devices.)

According to IPC/JEDEC J-STD 033B.1, IC packages should be stored in a dry box capable of maintaining either 10%RH or 5%RH in order to prevent components from absorbing moisture.

Storage in a cabinet below 5%RH: No limit in floor life.

Storage in a cabinet below 10%RH: Please see chart below for examples.

(Section of Table 7-1 from IPC/JEDEC J-STD 033B.1)

Package Type and Body Thickness	Moisture Sensitivity Level	Floor life depending on humidity and temperature										Temp
Package Type and Body Thickness	Moisture Sensitivity Level	5*	10*	20*	30*	40*	50*	60*	70*	80*	90*	Temp
Body Thickness > 3.1mm including PQFPs >84 pins, PLCCs (square) All MQFPs or All BGAs > 1mm	2a	∞ ∞ ∞ ∞	∞ ∞ ∞ ∞	94 124 167 231	44 60 78 103	32 41 53 69	26 33 42 57	16 28 36 47	7 10 14 19	5 7 10 13	4 6 8 10	←35ºC ←30ºC ←25ºC ←20ºC
	3	∞ ∞ ∞ ∞	∞ ∞ ∞ ∞	8 10 13 17	7 9 11 14	6 8 10 13	6 7 9 12	6 7 9 12	4 5 7 10	3 4 6 8	3 4 5 7	←35ºC ←30ºC ←25ºC ←20ºC
	4	∞ ∞ ∞ ∞	3 5 6 8	3 4 5 7	3 4 5 7	2 4 5 7	2 3 5 7	2 3 4 6	2 3 3 5	1 2 3 4	1 2 3 4	←35ºC ←30ºC ←25ºC ←20ºC
	5	∞ ∞ ∞ ∞	2 4 5 7	2 3 5 7	2 3 4 6	2 2 4 5	1 2 3 5	1 2 3 4	1 2 2 3	1 1 2 3	1 1 2 3	←35ºC ←30ºC ←25ºC ←20ºC
	5a	∞ ∞ ∞ ∞	1 2 3 5	1 1 2 4	1 1 2 3	1 1 2 3	1 1 2 3	1 1 2 2	1 1 1 2	1 1 1 2	1 1 1 2	←35ºC ←30ºC ←25ºC ←20ºC

* %RH

Resetting of Floor Life for MSLs 2~3 in a Dry Box Following IPC/JEDEC J-STD-033B.1(Example of Room Temperature Dehumidification.)

According to IPC/JEDEC J-STD-033B.1, IC packages for moisture-sensitivity levels 2-3 that have been removed from MBBs must be kept in dry storage capable of maintaining no greater than 10% RH. The floor life of these components can be reset if stored in a dry box at 10%RH for five times the exposure period(under the conditions of 30 degrees C, 60% RH.) The exposure time is limited to a maximum of 12 hours.

Resetting of Floor Life for MSLs 4~5, 5a in a Dry Box.

IC packages with moisture-sensitivity levels of 4~5,5a should be stored in a dry box capable of maintaining no greater than 5%RH. The floor life of the components can be reset by storing the packages within a dry cabinet capable of maintaining 5%RH or lower for a period of ten times the exposure period (under conditions of 30 degree C, 60% RH). The exposure time is limited to a maximum of 8 hours.