The thermal resistance for this part (Rth(j - mb)) appears to be in units of “K/W”, assuming Kelvin.
Is this a typo or should it read “C/W” i.e. Celsius?
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The unit would indeed refer to degrees Kelvin, but in context it’s interchangeable with celsius, since it’s referring to a temperature change/interval.
While the Kelvin and Celsius (or centigrade, if one prefers that name) scales are indeed different, they differ only by an offset; the interval or change in a physical quantity represented by 1 degree in either scale is identical. If temperature scales were rulers, the distance between marks on a Kelvin ruler and a Celsius ruler would be identical.
Because the increment represented by one degree in either scale is exactly the same, in the context of temperature changes or differences …