Questions related to COTS Boards (FIDES 2022)

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Christian Imbach
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Questions related to COTS Boards (FIDES 2022)

We are currently working on the implementation of FIDES 2022 in our software iQT.

 

I have a question related to the calculation of COTs boards. Our current implementation is based on FIDES Guide 2009 issue A. The Pi Factor calculation for COTs is on page 200 of the original standard. 

 

The following are the equations used for Pi_Tcy_solderjoints and Pi_Tcy_cases

In the latest 2022 standard, it seems that the equations used for these two factors are swapped. This is the screenshot from page 227 of the latest 2022 standard:

 

On page 218 of FIDES 2022, it indicates that the COTs category is not updated in this release compared to version 2020. We do not have the version between 2009 and 2022. So just want to check with you to see if this is an intended change or not.

 

Thank you so much for your help.

 

Best regards,

 

Christian Imbach