4 Automotive Device Lifetime Estimates

In the following sections, the estimated PoH are derived from an AEC-Q100 qualification using the following mission profile: 20 kHrs, with junction temperature usage as (-40°C = 6%, 70°C = 25%, 85°C = 25%, 100°C = 25%, 115°C = 14%, 125°C = 5%) and maximum CPU speed = 800 MHz.

Table 4-1. Automotive Device Power-on-Hours - PoH_Q(T_J,VDD)
Marking	Tier	T_J (°C)	Arm® Core Frequency (MHz)	VDDCPU (V)	Power-on Hours (Hrs)
-V/4HBVAO	Automotive	105	800	1.15	16,866
		105	600	1.05	45,848
		125	800	1.15	5,733
		125	600	1.05	15,584

The following chart shows the estimated PoH for different junction temperatures and 1.15V or 1.05V VDDCPU power supply. VDDCORE is set to 1.15V.

Figure 4-1. Automotive Device Power-On Hours Derating Chart - PoH_Q(T_J,VDD)