I347-AT4 Datasheet, PDF (146/148 Pages) Intel Corporation – Intel® Ethernet Network Connection I347-AT4 Datasheet

I347-AT4 — Thermal Design Recommendations
T_C
45
50
55
60
65
70
75
80
85
0
86.5
91.09
95.71
100.3
104.9
109.5
114.1
118.7
123.3
50
79.8
84.52
89.26
94.01
98.78
103.6
108.4
113.1
117.9
Airflow (LFM)
100
76.45
79.94
84.65
89.45
94.28
99.1
103.9
108.7
113.6
150
73.18
77.02
81.44
86.29
91.16
96.04
100.9
105.8
110.7
200
70.55
74.95
79.22
84.03
88.88
93.77
98.68
103.6
108.5
250
68.5
73.24
77.56
82.39
87.18
92.07
97.06
101.9
106.9
300
67.08
71.75
76.16
80.94
85.79
90.74
95.7
100.7
105.7
350
65.77
70.44
75.01
79.84
84.76
89.7
94.66
99.62
104.6
400
64.68
69.44
74.1
78.97
83.93
88.86
93.8
98.75
103.7
Note:
27 x 27 10 mmmm Thermalloy HS in Figure 7.3.
The red value(s) indicate airflow/ambient combinations that exceed the allowable case
temperature for the I347-AT4 at 3.0 W.
7.10
Component Measurement Methodology
Measurement methodologies for determining the case and junction temperature are outlined in the
sections that follow.
7.10.1 Case Temperature Measurements
Special care is required when measuring the T_case temperature to ensure an accurate temperature
measurement is produced. Use the following guidelines when measuring T_case:
• Use 36-gauge (maximum) K-type thermocouples.
• Calibrate the thermocouple before making temperature measurements.
• Measure the surface temperature of the case in the geometric center of the case top.
Note: It is critical that the thermocouple bead be completely in contact with the package surface.
• Use thermally conductive epoxies, as necessary (again, ensuring the thermocouple bead is in
contact with the package surface).
• Care must be taken in order to avoid introducing error into the measurements when measuring a
surface temperature. Measurement error may be induced by:
— Poor thermal contact between the thermocouple junction and the surface of the package.
— Contact between the thermocouple cement and the heat-sink base (if used).
— Heat loss through thermocouple leads.
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