Table 2.

Median lifetime τ at which a given percentage S(τ) of Alpha IMS and Alpha AMS devices is still functioning. he total system lifetime is calculated by a product of the component reliabilities according to Eq. 2

Component	Alpha IMS	Alpha AMS
	τ[years]	τ[years]
CMOS chip	1.22 (50 %)	6.04 (50 %)
Foil substrate	3.05 (50 %)	12.7 (50 %)
Power supply cable	1.57 (50 %)	7.04 (50 %)
Total median system	0.7 years	4.7 years
lifetime S=50 %