McDry Ultra-Low Humidity Storage Cabinets: IPC/JEDEC Dry Box Storage Guidelines

Dry Box Storage Guideline as Recommended by IPC/JEDEC J-STD 033D

According to IPC/JEDEC J-STD 033D, 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 033D) .

Package Type and Body Thickness Moisture
Sensitivity
Level
Floor life depending on humidity and temperature Temperature
5%
RH
10%
RH
20%
RH
30%
RH
40%
RH
50%
RH
60%
RH
70%
RH
80%
RH
90%
RH
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
←35℃
←30℃
←25℃
←20℃
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
←35℃
←30℃
←25℃
←20℃
4


3
5
6
8
2
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
←35℃
←30℃
←25℃
←20℃
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
←35℃
←30℃
←25℃
←20℃
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
←35℃
←30℃
←25℃
←20℃

Resetting of Floor Life for MSLs 2~3 in a Dry Box Following IPC/JEDEC J-STD-033D

Example of Room Temperature Dehumidification.

According to IPC/JEDEC J-STD-033D, 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.

Example of McDry Dehumidification of IC Package

Resetting of Floor Life for MSLs 2~3 in a Dry Box Following IPC/JEDEC J-STD-033D

Example of Room Temperature Dehumidification.
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.