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AM3352: MTBF

Part Number: AM3352

Hello!

Could anybody explain me, why at the different sources I found the differnt MTBF for the AM3352?

At the "sprabv9a" I read "The Texas Instruments AM335x products are designed to support an intrinsic reliability goal or wear-out rate of 50 FIT (MTBF = 2 e7 hours) for 100,000 power-on hours (POH), when used at a junction temperature of 105°C and nominal core voltage as defined by the device-specific data sheet. "

But at the  

 Early life failure rateMTBF / FITEarly life failure rate supporting dataMTBF / FIT supporting data
Part numberELFR-DPPMMTBFFITConf level (%)Test temp (�C)Sample sizeFailsUsage temp (�C)Conf level (%)Activation energy (eV)Test temp (�C)Test duration (hours)Sample sizeFails
AM3352BZCZD80 - 3.621x 10 8 2.76 - - - - 55 60.0 0.5 130 1000 1790

3

So, At the second source the temperature is higher and the MTBF is higher? Why?