# RJ-A Impact on TA_MAX

As an example, the figure below shows the simulation result TA = f(TJ) of two boards running the same software as in Use Case 2 (iPerf test on Typical part). For the first board, the simulation condition is RJ-A  = 20°C/W and for the second one, RJ-A = 40°C/W.

The ambient temperature (TA_MAX) for which TJ = 105°C is extracted in both cases. TA_MAX is 83°C for the first board and 62°C for the second one.

Figure 1. RJ-A Impact on TA_MAX