26E/3DA POWDER

LA/CIII/UltraMOV Series

March 4th 2002

Reliability Data Summary

Test Name	Conditions	Device Hours	Rejects	FIT
High Temperature Operating Life	125°C, 1000hrs, Vrated	3082000	0	0.28416
High Temperature Storage	150°C, 1000hrs	1398000	0
Low Temperature Storage	-55°C, 1000hrs	515000	0
Humidity	85°C/85RH, 1000hrs	945000	0
Bias Humidity	85°C/85RH, 1000hrs,Vrated	360000	0
Temperature Cycle	-55°C, 25°C,125°C 15min,5min,15min	630	0
Peak Pulse	(8/20uS)	2310	0
Energy	(10/1000uS)	1005	0

CALCULATION OF FAILURE RATE FOR MOV'S						LA/CIII/UltraMOV
	ARRHENIUS MODEL
		MTBF = e^c+(k/t) Where MTBF = Mean Time Between Failures in Hours C&K = Empirically derived constants T = Absolute temperature (k) = T( C)+273 Note : 1 Failure in time (FIT) = 10^9 Hours at 55 C
Klow =	6649.4
Khigh =	13129.7
No units tested =	3082
No units failed =	1
K	13129.7
	MTBF = (e^(K/328-K/398))*(No units tested*1000) =					3.8152E+9
	FIT = 1/(MTBF/(No units failed *10^9)) =					0.28416 FIT

Note :In the model one failure in time has to be estimated in order for the calculations to be completed.