Table 1a.
Temperature Factor @ 40 °C
Stress Factor at 50%
1
1
Reliability Prediction Based On
Telcordia SR-332 Issue 3 – Parts Count Method
Environmental Factor
1
Component
Component Standard
Failure Rate Deviation Quality Failure Rate Deviation
Total
Total Component
Component Standard
Telcordia
Information
Laser
Telcordia (Photodiode)
Telcordia: (91-170 transistor) 3
Telcordia: (91-170 transistor) 1
Fixed Ceramic
Thick Film
Component
1G FP Laser Diode
Photodiode
IC
Quantity (FITs)
(FITs)
81
5.5
Factor (FITs)
(FITs)
64.8
4.4
1
1
100
7.7
7.7
7.7
0.1
0.18
3.8
0.8
0.8
0.8
0.8
1
80
6.16
18.48
6.16
0.3
5.5
5.5
13.2
4.4
IC
Capacitors
Resistor
3
5
1
0.01
0.13
3.9
0.03
0.65
3.9
1
1
0.9
3.8
IC 8-BIT MCU W/8K FLASH CMOS Technology
256B RAM 36-LFBGA
Connector
PCB, Edge / Multi-Pin
20
0.13
0.088
1
2.6
1.76
118.4
8.45E+06
66.6
Module Failure @ 40 °C (Total FITs)
MTTF @ 40 °C (Hours)
1.50E+07
FITs at other temperatures can be derived following The limitations of the FIT prediction based on the Parts
the procedure of Telcordia SR-332, assuming activation Count Method include the fact that the piece part failure
energy, Ea, of 0.35 eV to determine the component tem- rates are obtained from Telcordia database, which may
perature factor πT. Table 1b shows the FITs at different not be exhaustive for state-of-the-art piece parts, and that
temperatures for the transceiver.
the results are independent of true module environmen-
tal stress tests. Nevertheless, the information obtained
from the Parts Count Method is a useful reference during
design-in and evaluation. Whenever possible, Avago sub-
stitutes internal data for the FIT rates of individual com-
ponents, and predictions will be updated as more current
data becomes available.
FITs between 60% and 90% Upper Confidence Levels
(UCLs) can be derived following the procedure ofTelcordia
SR-332 to determine the shape κ and scale θ of the gamma
distribution. Table 1c shows the FITs at the UCLs.
Table 1b. FIT rates at different operating case temperatures, Table 1c. FIT rates at 40 °C at 60% and 90% Upper Confidence
following the Telcordia Parts Count Method
Level, following the Telcordia Parts Count Method
T
case
(° C)
FITs
UCL
FITs
25
40
50
60
61.6
60%
122.8
118.4
177.6
260.5
90%
207.7
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Data subject to change. Copyright © 2005-2013 Avago Technologies. All rights reserved.
AV02-3018EN - November 22, 2013