App note from Richtek about thermal resistance calculation using component thermal parameters found on datasheets. Link here (PDF)
Thermal issue has been a crucial topic for a long time since high power density and low cost requirements became popular. As a power engineer, the assessment of maximum allowable power dissipation of every component in the system is one of the most important topics when developing a brand new product with good reliability. Generally, each component has a specific thermal characteristics table, which can be found in the datasheet. There are many thermal resistance listed in the table, including θJA, θJB, θJC…etc.