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February 2002

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Fri, 15 Feb 2002 20:16:03 EST
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Hi MoonMan,
I need to burst your bubble, but neither HALT nor HAST are accelerated
reliability tests, and therefore it is impossible to correlate the results
from HALT/HAST to design rule selections (BGA pad sizes, etc., manufacturing
processes, etc.) or other physical/material design parameters and the
resulting reliability for product in normal use. HALT/HAST serve the purpose
of extreme robustness tests, looking for weak spots, and cause failures with
damage mechansims and failure modes not found in product use.
HOWEVER, there sure are lots of data correlating the results from proper
accelerated reliability tests to design rule selections (BGA pad sizes, etc.,
manufacturing processes, etc.) or other physical/material design parameters
and the resulting reliability for product in normal use. That is how
IPC-SM-785, IPC-D279 and IPC-9701 were developed.
You have just been barking up the wrong tree--are there trees in your cave?

Werner

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