fxo-hc72 Fox Electronics, fxo-hc72 Datasheet - Page 13

• Manufacturer Part Number: fxo-hc72
• Description: Hcmos 7 X 5mm 2.5v Oscillator
• Manufacturer: Fox Electronics

Products are grouped together by process for MTTF calculations.
(All XpressO output and package types are manufactured with the same process)
Number of Parts Tested:
Number of Failures: 0
Test Temperature:
Number of Hours:
MTTF was calculated using the following formulas:
[1.] Device Hours (devhrs) = (number of devices) x (hours at elevated temperature in °K)
[2.]
[3.] FITS =
Where:
DEVICE-HOURS = 360 x 2000 HOURS = 720,000
ACCELERATION FACTOR =
MTTF =
Failure Rate =
FITS = Failure Rate *1E9 = 26
Label
MTTF / FITS Calculations
MTTF
af
eV
k
t
t
Θ
r
χ
1
2
2
720
=
MTTF
,
000
devhrs
720
1
Name
Acceleration Factor
Activation Energy
Boltzmann’s Constant
Theta
Failures
Chi-Square
×
. 1
,
49
000
833
χ
.
125°C
2000
91009
×
×
. 1
2
* 10
af
49
833
.
91009
×
×
9
2
2
360 (120 of each output type: HCMOS, LVDS, LVPECL)
= 39,209,238 Hours
×
e
2
(
= 2.55E-8
. 8
. 0
625
40
© 2008 FOX ELECTRONICS | ISO9001:2000 Certified
)
×
(
Formula/Value
0.40 V
8.62 X 10
Operating Temperature (°K)
Accelerated Temperature (°K)
Confidence Level (60% industry standard)
Number of failed devices
statistical significance for bivariate tabular analysis [table
look-up] based on assumed Θ (Theta – confidence) and
number of failures (r)
χ
298
e
2
1
= 1.830
(
−
eV
k
398
1
Page 13 of 14
)
×
)
(
-5
t
1
1
= 49.91009
eV/°K
−
t
1
2
)
For zero failures (60% Confidence):
FXO-HC72 Series