Are There Any Reasons Why Junction-to-case (or Channel-to-case) Thermal Resistance Is Not Specified For Small-package Devices?
Neither junction-to-case thermal resistance, Rth (j-c), nor channel-to-case thermal resistance, Rth (ch-c), is specified because small-package devices do not dissipate much heat and because temperatures on the surface of small packages cannot be measured accurately. For thermal design, use either junction-to-ambient thermal resistance, Rth (j-a), or channel-to-ambient thermal resistance, Rth (ch-a), instead.
