Data Sheet

Thermal Considerations—Ethernet Controller I210
845
13.5 Package Thermal/Mechanical Specifications and Limit
13.5.1 Thermal Limits - Max Junction/Case
To ensure proper operation of the I210, the thermal solution must dissipate the heat generated by the
component and maintain a case temperature at or below the values listed in Table 13-24.
The I211 is designed to operate properly as long as the T
case
rating is not exceeded. Section 13.7.1
discusses proper guidelines for measuring the case temperature.
Table 13-24.Absolute Maximum Case Temperature
The thermal limits listed in Table 13-24 are based on simulated results of the package assembled on a
standard multi-layer, 2s2p board with 1oz internal planes and 2oz external trace layers in a forced
convection environment. The maximum case temperature is based on the maximum junction
temperature and defined by the relationship, T
case-max
= T
j-max
- (Ψ
JT
* P
TDP
) where Ψ
JT
is the
junction-to-top (of package) thermal characterization parameter. If the case temperature exceeds the
specified T
case
max, thermal enhancements such as heat sinks or forced air is required.
Analysis indicates that real applications are unlikely to cause the I210 to be at T
case-max
for sustained
periods of time, given a properly designed thermal solution. Sustained operation at T
case-max
might
affect long-term reliability of the I210 and the system and thus should be avoided.
13.5.2 Thermal Specifications
The following table lists the package specific parameters under different conditions and environments.
The values ө
JA
and Ψ
JT
should be used as reference only as they will vary by system environment and
thermal solution. Unless otherwise noted, the simulations were run in a JEDEC environment with a four
layer (2s2p), 76.2 mm x 114.3 mm board with no heat sink.
Measured TDP (W) T
case-max
(°C)
0.74 W @ 70 °C Ambient Temperature 85
0.80 W @ 85 °C Ambient Temperature 105
Parameter Equation Conditions
No Heat Sink
(°C/W)
Θ
JA
P = TDP
No Airflow 30.7
1 m/s 20.9
2 m/s 19.1
3 m/s 18.2
Ψ
JT
P = TDP
No Airflow 0.06
1 m/s 0.31
2 m/s 0.48
3 m/s 0.63