As solderability of finished leads does decrease with time and temperature by copper-tin diffusion it is not enough to control humidity for long term storaged (20 Years) leaded components.
Are there any recommendations to control long time solderability levels for thin finishes, thick finishes, goldfinishes, finishes with nickel barrier etc.?
Are there any experineces to keep long term solderability by storing in low temperetaure? (which decreases copper-tin diffusion speed)
Are there any recommedations/rules to distinguish between parts/component-classes which are suitable to recover solderability by hot solder dip and parts/component-classes which are not or problematic.?
Sincerly
Michael Jeremias,
-----Ursprüngliche Nachricht-----
Von: TechNet [mailto:[log in to unmask]] Im Auftrag von Leland Woodall
Gesendet: Montag, 22. Februar 2010 22:30
An: [log in to unmask]
Betreff: Re: [TN] Ideal Component Storage RH Levels
Thanks, everyone, for your great input today on this. Have a great week!
Leland
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Thayer, Wayne - IIW
Sent: Monday, February 22, 2010 1:30 PM
To: [log in to unmask]
Subject: Re: [TN] Ideal Component Storage RH Levels
Want assembly area low static, storage area low corrosive and low moisture.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Guy Ramsey
Sent: Monday, February 22, 2010 1:12 PM
To: [log in to unmask]
Subject: Re: [TN] Ideal Component Storage RH Levels
Moisture in the air is helpful in ESD control. It is bad for MSD. I have always tried to keep locations where sensitive parts will be handled below 50% RH and above 30% RH.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Leland Woodall
Sent: Monday, February 22, 2010 10:56 AM
To: [log in to unmask]
Subject: [TN] Ideal Component Storage RH Levels
Good morning, everyone.
After a long weekend of working inventory, I received a question today regarding the recommended RH levels for our component storage rooms. I know there is probably not a "one size fits all" answer. Definitely, an "it depends" kinda thing...
But assuming all of our MSDs are kept in vacuum sealed bags until ready for use, will some of you please share your thoughts regarding this?
Thanks,
Leland
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