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For the $2 \mathrm{~N}$ $338$ transistor, the manufacturer specifics $\mathrm{P}_{\max }=100 \mathrm{~mW}$ at $25^{\circ} \mathrm{C}$ free-air temperature and the maximum Junction temperature, $\mathrm{T}_{\mathrm{imax}{ }^{\prime}}=125^{\circ} \mathrm{C}$. Its thermal resistance is