Abstract: The specification provides arrangements including an electronic controller unit, ECU, comprising a heatsink, a first printed circuit board, PCB; and a second printed circuit board, PCB. A plurality of components are provided located on said PCBs. The heatsink is arranged between the first and second PCBs and is thermally coupled to the components to provide cooling. The heatsink further comprises an aperture extending through a body of the heatsink. The first PCB is directly connected to the second PCB by a board-to-board, B2B, connector configured to electrically and/or communicatively connect the PCBs located above and below the heatsink. The specification also provides arrangements of a heatsink provided for use within an ECU.

Abstract: An electronic system is described that comprises a first board and a first processing unit, wherein the first processing unit comprises a first semiconductor chip arranged on a first surface of the first board; a first cooling unit facing the first surface of the first board and configured to cool the first semiconductor chip; at least one further board and a second processing unit, wherein the second processing unit comprises a further semiconductor chip arranged on a first surface of the at least one further board; and a second cooling unit facing the first surface of the at least one further board and configured to cool the further semiconductor chip. The first board and the at least one further board are spaced apart from each other. The first cooling unit is a passive cooling unit, and the second cooling unit is an active cooling unit.

Abstract: An electronic system is described that comprises a first board and a first processing unit, wherein the first processing unit comprises a first semiconductor chip arranged on a first surface of the first board; a first cooling unit facing the first surface of the first board and configured to cool the first semiconductor chip; at least one further board and a second processing unit, wherein the second processing unit comprises a further semiconductor chip arranged on a first surface of the at least one further board; and a second cooling unit facing the first surface of the at least one further board and configured to cool the further semiconductor chip. The first board and the at least one further board are spaced apart from each other. The first cooling unit is a passive cooling unit, and the second cooling unit is an active cooling unit.