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  #1  
Old May 26th, 2004, 07:59 AM
George Azzopardi
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Default A common problem when trying

A common problem when trying to do reliability prediction using the models in MIL-HDBK-217 is how to assign quality levels to individual components. You could simply assign the lowest quality level specified in the model since it is difficult to find this kind of info on a daatsheet. But by doing so the values obtained are too conservative. How can i make a good judgement on this quality level? The system under study is used in the automotive industry. Specifically for surface mount resistors which qulaity level should be used?
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Old May 27th, 2004, 02:20 PM
Daniel
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Default There are lots of problems wi

There are lots of problems with 217. Thatís why it was discontinued. No matter what you assume the answer isnít going to reflect reality. The idea of 217 was to compare not necessarily predict, so as long as you are consistent in what you assume it should be OK.
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  #3  
Old July 29th, 2010, 06:08 AM
Norbyzuka Norbyzuka is offline
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Default Re: Quality Levels in MILHDBK217

Do you have some information about the update of quality factor of Mil-hdbk-217F n2 by VITA-51?
(ANSI/VITA 51.1-2008)
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Old July 29th, 2010, 02:34 PM
David David is offline
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Default Re: Quality Levels in MILHDBK217

The information that I do have is that for IC, semi-conductors, resistors and capacitors the quality level for commercial components was changed from values to around 10 to values in the range of 0.1 to 1.

For additional information, you can visit the VITA website at http://www.vita.com/vso-stds.html.

I hope this helps.
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  #5  
Old August 16th, 2010, 05:31 AM
Norbyzuka Norbyzuka is offline
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Default Re: Quality Levels in MILHDBK217

Thanks for your reply
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