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What is a radiation equivalent circuit?

A radiation equivalent circuit (Figure 1) is a thermal circuit described by an electrical circuit.
By replacing the heat flow by current, the heat path conducted to the outside can be represented by an electric circuit.
Figure 2 shows the thermal resistance from device junction to ambient.

For radiation equivalent circuit, please refer to “Thermal Design and Attachment of a Thermal Fin: Power MOSFET Application Notes (PDF:1,061KB)

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