器件：热阻thermal resistance

参考应用笔记：

1. How to Properly Evaluate Junction Temperature with Thermal Metrics： https://www.ti.com/lit/an/slua844b/slua844b.pdf

2. Package Thermal Characterization Methodologies：https://www.ti.com/lit/an/szza003/szza003.pdf

3. Engineer It: Measuring Thermals - How Hot is Your LDO?

4. Semiconductor and IC Package Thermal Metrics: https://www.ti.com/lit/an/spra953c/spra953c.pdf