I'll take a guess at the terms. I suspect the term thermal impedance may be misapplied. There is a rather lose parallel. Electrical resistance is a scalar quantity. Electrical impedance is a vector quantity. In a strict sense the impedance to heat transfer is a 3D quantity that can be represented by a surface integral. Any portion of that quantity could be represented as a vector quantity.
In another sense thermal analysis would deal with the total thermal impedance. A heat sink would normally be specified for thermal resistance. Fred Townsend LEUNG YAT WAH DEREK wrote: Who can tell me what is the difference between "thermal impedance" and "thermal resistance" when talk about heat sink, thanks. Derek Leung.
