|Ask the Experts|
June 2, 2020
Looking for Long-term Component Storage Options
Looking for long-term (10+ years) options to store components (IC's) in dry or nitrogen environment. Can you provide some options?
|Expert Panel Responses|
J-STD-033D, "Handling, Packing, Shipping and Use of Moisture/Reflow Sensitive Surface Mount Devices" offers three methods. Here is a brief summary:
1) Store in a Moisture barrier bag (MMB) with Humidity indicator card (HIC), per Section 3, and checking the HIC and resealing every 12 months, baking any components whose HIC show exposure due to failed MMB.
2) Store in a dry atmosphere cabinet purged with nitrogen at <=5%RH and temperatures 25+/-5C.
3) Store in a dry atmosphere cabinet purged dry air (desiccant) <=5%RH and temperatures 25+/-5C.
All of these methods have a cost, although most agree that a desiccant (dry air) driven Dry storage cabinet (#3) has the lowest overall cost to own and operate.
Senior Project Engineer
Electronic Controls Design Inc
10 years is a really long time. The main concern is deterioration of solderability. But if you do have to store, oxygen free environment, that means nitrogen environment for storage is a good option. It is better than just dry environment.
Ray Prasad Consultancy Group
10 years... Wow. Are these IC's in the original tubes? Hopefully they were provided in ESD compliant products.
From moisture perspective that device need to be sealed in MVB, moisture vapor barrier bags, under a vacuum seal. The thickest possible bag available. Reality is there is no way to draw a total vacuum on earth. Best recommendation IMO is thickest MVP bag possible, Max vacuum draw with nitrogen purge & a verifying check annually. Storing in an N2 dry box for 10 years will be expensive.
Storage of components for ten years or longer is generally not a normal practice since most components are consumed on a first-in, first-out basis unless one is building end-of-life products. If the components in question are in their original sealed packaging from the component manufacturer there should not be a problem with long-term storage providing the MSL is 3 or less.
If the original packaging has been opened it should be resealed in a moisture barrier bag together with a desiccant and a RH indicator card to indicate the RH remains below 5%, and they should be stored in a nitrogen dry cabinet.
As a precaution you should always double check with the component manufacturer as to their recommendations for long-term storage.
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