HEDS-5500 查看數據表（PDF） - Avago Technologies
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HEDS-5500 Datasheet PDF : 4 Pages
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Table 2.
Ambient
Temperature (°C)
+100
+90
+80
+70
+60
+50
+40
+30
+20
Junction
Temperature (°C)
+110
+100
+90
+80
+70
+60
+50
+40
+30
Point Typical Performance [1]
in Time
MTBF [1]
Failure Rate
(%/1K Hours)
703,000
0.142
996,000
0.100
1,440,000
0.069
2,126,000
0.047
3,210,000
0.031
4,968,000
0.020
7,901,000
0.013
12,942,000
0.008
21,903,000
0.005
Performance in Time [2]
(90% Confidence)
MTBF [2]
Failure Rate
(%/1K Hours)
264,000
0.379
374,000
0.267
541,000
0.185
799,000
0.125
1,206,000
0.083
1,867,000
0.054
2,969,000
0.034
4,863,000
0.021
8,230,000
0.012
Notes:
1. The point typical MTBF (which represents 60% confidence level) is the total device hours divided by the number of failures. In the case of zero
failures, one failure is assumed for this calculation.
2. The 90% Confidence MTBF represents the minimum level of reliability performance which is expected from 90% of all samples. This confidence
interval is based on the statistics of the distribution of failures. The assumed distribution of failures is exponential. This particular distribution is
commonly used in describing useful life failures. Refer to MIL-STD-690B for details on this methodology.
3. Failures are catastrophic or parametric. Catastrophic failures are open, short, no logic output, no dynamic parameters while parametric failures
are failures to meet an electrical characteristic as specified in product catalog such as output voltage, duty or state errors.
Example of Failure Rate Calculation
Assume a device operating 8 hours/day, 5 days/week. The utilization factor, given 168 hours/week is:
(8 hours/day) x (5 days/week) / (168 hours/week) = 0.25
The point failure rate per year (8760 hours) at 50°C ambient temperature is:
(0.020% / 1K hours) x 0.25 x (8760 hours/year) = 0.044% per year
Similarly, 90% confidence level failure rate per year at 50°C:
(0.054% / 1K hours) x 0.25 x (8760 hours/year) = 0.118% per year
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