82541ER Datasheet, PDF (37/48 Pages) Intel Corporation – 82541ER Gigabit Ethernet Controller

82541ER Gigabit Ethernet Controller
5.2
Thermal Specifications
The 82541ER device is specified for operation when the ambient temperature (T_A) is within the
range of 0^° C to 70^° C.
T_C (case temperature) is calculated using the equation:
T_C = T_A + P (θ_JA - θ_JC)
TJ (junction temperature) is calculated using the equation:
T_J = T_A + P θ_JA
P (power consumption) is calculated by using the typical I_CC and nominal V_CC. The preliminary
thermal resistances are shown in Table 24.
Table 24. Thermal Characteristics
Symbol
Parameter
θ_JA
Thermal resistance, junction-to-ambient
θ_JC
Thermal resistance, junction-to-case
Preliminary Value at specified
airflow (m/s)
0
1
2
29
25.0
23.5
11.1
11.1
11.1
Units
C/Watt
C/Watt
Thermal resistances are determined empirically with test devices mounted on standard thermal test
boards. Real system designs may have different characteristics due to board thickness, arrangement
of ground planes, and proximity of other components. The case temperature measurements should
be used to assure that the 82541ER device is operating under recommended conditions.
Datasheet
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