PCB Tech - Low-humidity electronic moisture-proof box assists circuit board assembly plants to solve the problem of damp damage

Low-humidity electronic moisture-proof box assists circuit board assembly plants to solve the problem of damp damage

If SMD components above MSL2 are not placed in a dry package (but within the workshop life time), they need to be re-dried before use. However, it is often encountered that the components to be used may be baked in an oven for a long time or repeatedly baked Baking may still reduce the reliability of the components. At this time, room temperature drying is very important. As long as most components are stored below 10%RH, they can meet most of the specifications of J-STD-033B, and there is no need to worry. Long-term high-temperature baking or repeated baking may have adverse effects on the components.

J-STD-033B table 1 detailed description of different MSL:

※ MSL2,2a,3,4 components exposure time≦12hrs+humidity environment≦30°C/60%RH, as long as it is placed in an electronic drying cabinet below 10%RH, after 5 times the time of exposure to the atmosphere, there is no need to go through drying The original floor life of SMD can be reset by baking.

※ MSL5, 5a module exposure time≦8hrs+humidity environment≦30°C/60%RH, as long as it is placed in an electronic drying cabinet below 5%RH, after 10 times of exposure to the atmosphere, it can be reheated without baking Set SMD's original workshop time (Floor life).

※ If the components are exposed to the PCBA processing factory environment for more than 1 hour, the shop life may not be stopped or recalculated after receiving the dry packaging or drying box, but if the SMD humidity sensitive components are exposed to the environment below 30 degree Celsius/60%RH, A desiccant or drying cabinet can be used to dry SMD components according to Table 4-3 in J-STD-033B. Therefore, after opening the dry package, it can be placed in an ultra-low humidity and moisture-proof cabinet, which can avoid the problem of long-term exposure and re-baking.

※ J-STD-033B can use dry air or nitrogen to maintain the low humidity and dry function, and the low humidity drying cabinet needs to return to the original equilibrium humidity within 1 hour after opening and closing the door. But if you think about it carefully, if you use dry air, you need an air compressor, oil filter, and water filter parts. This is an increase in the cost of consumables, and it is not cost-effective in the long run. If you use nitrogen, you need to add nitrogen immediately after opening the door. Open the door 10 times a day, and you need to add nitrogen 10 times. In a year, you need to add 3650 times with a volume of 1300L each time. This should be easy to calculate. How much does it cost to maintain a low environment. Therefore, the use of a moisture-proof home ultra-low humidity drying cabinet can easily achieve a long-term humidity maintained below 5%RH, and the original equilibrium humidity can be reduced to the original equilibrium humidity within 30 minutes after opening and closing the door, which is far better than the standard in the J-STD-033B specification, And there is no high unit price consumables (oil filter, water filter, nitrogen, etc.) when it is used, which is a truly effective, energy-saving and high-efficiency storage method.

※ J-STD-033B mentioned earlier that if the humidity of the ultra-low humidity drying cabinet is not lower than 10%RH, it cannot be regarded as a dry package that meets the SMD standard. At this time, please refer to the storage in J-STD-033B Humidity and time, if it exceeds the allowable humidity and time standards, you must refer to the re-bake to restore the life of the workshop. Therefore, an ultra-low humidity drying cabinet that can maintain a long time below 10% RH can help you ensure that the SMD components are in good condition. It will fail. If the components are not used in production, they do not need to be repeatedly baked when they are placed in an environment below 10%RH or 5%RH, which can avoid the possibility of component failure due to repeated baking for a long time.

※ As long as the total exposure time of SMD complies with relevant specifications and is placed in an environment with a humidity lower than 10%RH, the accumulated floor life time can be suspended or stopped.

Moisture-proof home ultra-low humidity drying cabinet SL series products provide 40%RH to 1%RH adjustable humidity control models, and its superior dehumidification performance (the humidity can quickly fall to below 10%RH within 5 minutes after opening the door for 30 seconds). It replaces nitrogen filling and dry air assist, poor dehumidification efficiency of baking furnace, high temperature, thermal effect, material aging, etc. The SL series products can even store the products at a humidity below 5%RH for a long time to ensure that your products maintain a high yield.
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