Semiconductor apparatus including different thermal resistance values for different heat transfer paths

A semiconductor apparatus comprising:

• a substrate;
• a plurality of transistor groups disposed on the substrate, each of the plurality of transistor groups including
• a plurality of unit transistors arranged in a first direction within a plane of a top surface of the substrate, the plurality of transistor groups being arranged in a second direction perpendicular to the first direction,
• an insulating film that covers the plurality of unit transistors and includes at least one cavity;
• and
• a metal member that is disposed on the insulating film and is electrically connected to the plurality of unit transistors via the at least one cavity, wherein
• a heat transfer path is formed by a metal in a region from each of the plurality of unit transistors forming a plurality of heat transfer paths to a top surface of the metal member, and thermal resistance values of the heat transfer paths are different from each other among the plurality of unit transistors,
• each of the plurality of unit transistors includes an operating region through which an operating current of a corresponding unit transistor flows, and a smallest rectangle including the operating region therein and having sides parallel with the first direction as viewed from above is defined as an effective operating region of a corresponding unit transistor;
• a first boundary line is defined, in the second direction, between each respective adjacent transistor group, and a line positioned outward of each of outermost transistor groups positioned most outwardly in the second direction is defined as an outermost first boundary line, each of the first boundary lines being parallel with the first direction, and, for each of the plurality of transistor groups, a second boundary line is defined, in the first direction, between two unit transistors of the respective transistor group and a line positioned outward of each of outermost unit transistors positioned most outwardly in the first direction is defined as an outermost second boundary line, the second boundary lines being parallel with the second direction, the first boundary lines and the second boundary lines forming a plurality of sections, and a range by which each of the plurality of sections overlaps the metal member as viewed from above is defined as a heat-dissipating range corresponding to the effective operating region contained within a corresponding section;
• each first boundary line between adjacent transistor groups is defined at a position at which an average distance from the respective first boundary line to the effective operating regions of one transistor group becomes equal to an average distance from the first boundary line to the effective operating regions of an other transistor group;
• the outermost first boundary line is defined at a position at which an average distance from the outermost first boundary line to the effective operating regions of the outermost transistor group becomes equal to an average distance from the first boundary line positioned one line inward from the outermost first boundary line to the effective operating regions of the outermost transistor group;
• each second boundary line between adjacent unit transistors is defined at a position at which a distance from the respective second boundary line to the effective operating region of one unit transistor becomes equal to a distance from the second boundary line to the effective operating region of an other unit transistor;
• for each of the plurality of transistor groups, the outermost second boundary line is defined at a position at which a distance from the effective operating region of the outermost unit transistor to the outermost second boundary line becomes equal to a distance from the effective operating region of the outermost unit transistor to another second boundary line adjacent to the outermost second boundary line;
• and
• the thermal resistance values of the heat transfer paths are different from each other among the plurality of unit transistors by a first structure or a second structure, the first structure being a structure in which, in at least one pair of two adjacent heat-dissipating ranges in the second direction, an area by which one heat-dissipating range overlaps a corresponding cavity is different from an area by which the other heat-dissipating range overlaps a corresponding cavity, the second structure being a structure in which, in at least one pair of two adjacent heat-dissipating ranges in the second direction, an area of one heat-dissipating range and an area of the other heat-dissipating range are different from each other.