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July 2000

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Subject:
From:
Craig Hillman <[log in to unmask]>
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Date:
Mon, 24 Jul 2000 13:44:22 -0400
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Jason,

        If the failed mechanism is corrosion of a glass diode, you may
need to precondition your sample before you subject it to HAST
testing. Preconditioning would most likely consist of temperature
cycling or power cycling, though care must be taken not to
overstress the part beyond the stresses expected in its operating
environment. In addition, during HAST avoid extremely high relative
humidities (i.e., 95%), as you will often get moisture condensation,
which may not be an actual condition in the field.

Best Regards
Craig

Dr. Craig Hillman
CALCE Electronic Products and Systems Consortium
University of Maryland
College Park, MD  20742
(301)-405-5316
[log in to unmask]

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