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| Dry Box Storage Guideline as Recommended by IPC/JEDEC J-STD 033D
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(Handling, Packing, Shipping and Use of Moisture/Reflow Sensitive Mount Devices.)
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.
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・Storage in a cabinet below 5%RH: No limit in floor life. |
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・Storage in a cabinet below 10%RH: Please see chart below for examples. |
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(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
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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℃ |
s
Resetting of Floor Life for MSLs 2~3 in a Dry Box Following IPC/JEDEC J-STD-033D(Example of Room Temperature Dehumidification.)
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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. |

↑Click on the above graph for magnification.
Resetting of Floor Life for MSLs 4~5, 5a in a Dry Box. |
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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. |
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