heatsink (100) for forced convection cooling of a heated element, quecomprende: - a first manifold (2) connected to an input distribution (1, 1 ') of cooling fluid; - A second manifold (5) of confluence connected to an outlet (6, 6 ') of cooling fluid and disposed enparalelo and adjacent to the first collector (2) being disposed the first and second manifolds unlado heatsink (100); and - a container (4) heat transfer including a mounting surface element Yal least one or more channels (3, 3A, 3B) is heated in the container, the channel (3, 3A being connected, 3B) the primery the second manifolds (2, 5), - wherein the channel (3, 3A, 3B) inside the container (4) heat transfer includes a first channel (3a) leg connected to the first collector (2) and a second channel (3b) connected to the second return collector (5), and - a channel (3c) U-shaped connecting the first and second channels; - Wherein the first channel (3a) and the second channel (3b) are arranged in the same plane along lasuperficie mounting element heats the container (4) heat transfer and below it, - wherein the collector (5) located closer to the container (4) heat transfer is offset conrespecto to the plane of the channels (3a, 3b), and the first and second channels are connected to one of the first ysegundo collectors by respective first and second channels (16c, 16d) connection.