|Ask the Experts|
January 10, 2011
Component Storage Recommendations
What do you recommend as an environment for component storage to prohibit oxidation? Relative humidity, nitrogen atmosphere, temperature etc. Is there a standard storage environment scenario considered as good practice?
|Expert Panel Responses|
There are several mechanisms which will degrade solderability dependant on the type of finish. Oxidation or corrosion which are influenced by the atmosphere the parts are stored in terms of oxygen and humidity levels and intermetallic growth between substrates and plated layers which are accelerated by temperature. The storage used will very much depend on the length of time to be stored and how regular your access to the stock is required. For long term storage you could seal them within moisture barrier bags and store at low temperature to maximise useful life. For short term a clean area with temperature / humidity control should suffice. 15 to 21 C at 20 to 60% RH.
Principal Engineer - CMA Lab
According to IPC/JEDEC-J-STD 033B.1 Table 7-1, all level moisture-sensitive components may be exposed indefinitely in an environment that allows for 5%RH or under and maximum temperature of 35 degrees C. Under these storage conditions, oxidation should not be an issue for the short term or longer term of a few years.
Sales and Marketing Manager
Seika Machinery Inc.
To prevent oxidation nitrogen environment at nominal room temp is your best choice.
I agree with John Norton. In nitrogen atmosphere there is no moister nor oxygen (no oxidation). The nitrogen flow is minimum, just to keep low positive pressure inside cabinets.Luiz Felipe Rodrigues, Air Liquide
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