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MTBF Specification for Reliablity Analysis

Hi,
 
Good day.  We are using the following part in our design.  We are in the process of estimating the MTBF (reliability analysis) for the board. 
 
PART NO:
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1.SN74ACT86PWR
2.SN74AHC1G08DBVT  
 
So we need the MTBF (Mean Time Between Failure) specification for that part for the following environmental specification.
 
Module environmental specification:
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Environment               : Naval shelter
AmbientTemperature :  55oC
 
Please also send me other reliability data (if available) for other environmental specifications also