高温操作寿命HTOL及早期失效EFR计算公式

1、高高温温操操作作寿寿命命试试验验HTOL-High Temperature Operating LifeTest conditions：Stress Voltage VA=3.3 VStress TemperatureTA=125 KA=398 KTest durationtA=1000 hoursSample sizeN=77 pcsActivation EnergyEa=0.7 eVV=1 V-1k=8.62E-05 eV/KAF=AFt*AFv= 128.5029496AFt = exp (Ea/k) * (1/Kuse 1/KA)= 77.94097879AFv= exp (K/X)

2、* (VA Vuse) = exp V * (VA Vuse)= 1.64872127160% Confidence Level Result：Confidence Level(%)=60%Total Rejects(r)=0X2(%CL,2r+2)= 1.832581464=X2(%CL,2r+2)*109/2*AF*tA*N= 92.60394156 FITSMTTF=1/*109= 10798676.42 Device Hours= 1232.725619 Device YearsUse conditions：Normal Operating VoltageVuse=2.8 VNorma

3、l Operating TemperatureTuse=55 Kuse=328 K90% Confidence Level Result：Confidence Level(%)=90%Total Rejects=0X2(%CL,2r+2)= 4.605170186参考JESD74中Table J.1=X2(%CL,2r+2)*109/2*AF*tA*N= 232.7082966 FITSMTTF=1/*109= 4297225.388 Device Hours= 490.5508433 Device Years高高温温操操作作寿寿命命试试验验HTOL-High Temperature Oper

4、ating Life早早期期失失效效寿寿命命试试验验Test conditions：Stress Voltage VA=3.3 VStress TemperatureTA=125 KA=398 KTest durationtA=72 hoursSample sizeN=3000 pcsActivation EnergyEa=0.7 eVV=1 V-1k=8.62E-05 eV/KAF=AFt*AFv= 128.5029496AFt = exp (Ea/k) * (1/Kuse 1/KA)= 77.94097879AFv= exp (K/X) * (VA Vuse) = exp V * (VA

5、Vuse)= 1.64872127160% Confidence Level Result：Confidence Level(%)=60%Total Rejects(r)=0X2(%CL,2r+2)= 1.832581464=X2(%CL,2r+2)*109/2*AF*tA*N= 33.01159028 FITSMTTF=1/*109= 30292390.99 Device Hours= 3458.035501 Device YearsELFR (in ppm per tELF) = tELF 10-3 ELFR in FIT= 289.1815308 ppmTest Sample：1000p

6、cs/3lot(3 non-sequential)Use conditions：Normal Operating VoltageVuse=2.8 VNormal Operating TemperatureTuse=55 Kuse=328 KEarly life periodtELF=8760 hours90% Confidence Level Result：Confidence Level(%)=90%Total Rejects(r)=0X2(%CL,2r+2)= 4.605170186=X2(%CL,2r+2)*109/2*AF*tA*N= 82.95619832 FITSMTTF=1/*109= 12054554.33 Device Hours=