Tsi721 Datasheet 64 April 4, 2016
Integrated Device Technology
4.3 Thermal Characteristics
Heat generated by the packaged silicon must be removed from the package to ensure the silicon is maintained within its
functional and maximum design temperature limits. If heat buildup becomes excessive, the silicon temperature may exceed
the temperature limits. A consequence of this is that the silicon may fail to meet the performance specifications and the
reliability objectives may be affected.
Failure mechanisms and failure rate of a device has an exponential dependence on the silicon operating temperatures.
Therefore, the control of the package, and by extension the junction temperature, is essential to ensure product reliability. The
Tsi721 is specified safe for operation when the junction temperature is within the recommended limits as displayed in Tabl e 12.
Table 38 shows the simulated thermal characteristic (Theta JB and Theta JC) of the Tsi721 package.
Table 39 shows the simulated junction to ambient characteristics of the Tsi721. The thermal resistance Theta JA
characteristics of a package depends on multiple variables other than just the package. In a typical application, designers must
consider various system-level and environmental characteristics, such as:
• Package mounting (vertical/horizontal)
• System airflow conditions (laminar/turbulent)
• Heat sink design and thermal characteristics
• Heat sink attachment method
• PWB size, layer count, and conductor thickness
• Influence of the heat dissipating components assembled on the PWB (neighboring effects)
The results in Table 39 are based on a JEDEC Thermal Test Board configuration (JESD51-9), and do not factor in the
system-level characteristics described above. As such, these values are for reference only.
4.4 Moisture Sensitivity
The moisture sensitivity level (MSL) for the Tsi721 is 4.
Table 38: Junction to Ambient Characteristics – Theta JB/JC
Interface Results (C/W)
Theta JB 8.78
Theta JC 0.11
Table 39: Junction to Ambient Characteristics – Theta JA
Device
Theta JA (C/W)
0 m/s 1 m/s 2 m/s
Tsi721 13.1 12.06 11.4
