A tubular array heat exchanger and a method of manufacturing the same are provided. The heat exchanger includes a plurality of tubes extending between a tube inlet and a tube outlet. An inlet manifold includes an inner wall and an outer wall defining an inlet plenum and one or more baffles extending between the inner wall and the outer wall to divide the inlet plenum into a plurality of fluid passageways, each of the plurality of fluid passageways extending between the inlet plenum and a respective one of the tube inlets. The tubes, the inlet manifold, and an outlet manifold identical to the inlet manifold are manufactured as a single monolithic component.