What is the Si4133's thermal performance?
The Si4133 TSSOP thermal details are as follows:
● Max TJ = 125 °C
● Theta ja (qJA) = 79.9 °C/W
● Theta jc (qJC) = 16.8 °C/W
The thermal resistances are based on simulation assuming natural convection only. This information applies to the derivative RF Synthesizer products such as the Si4126 also.
We expect the QFN package to be superior thermally. While we don't have any specific Si41xx QFN thermal data we do have some generic thermal data for the 28 lead 5x5 mm MLP. In this case, the qJAis calculated to be 34.8 °C/W.