Microchannel cooling device for small heat sources

According to the invention, an apparatus for transferring heat with a target is disclosed. The apparatus may include a body which defines a surface, inlet port, inlet manifold passages, heat transfer passages, outlet manifold passages, and outlet port. The surface may couple the target with the body. The inlet port may be configured to receive and direct a fluid into inlet manifold passages. The inlet manifold passages may be configured to receive and direct the fluid to the heat transfer passages. The heat transfer passages may be configured to receive and direct the fluid in a direction substantially parallel to the surface and substantially perpendicular the input manifold passages. The outlet manifold passages may be configured to receive and direct the fluid to an outlet port. The outlet port may be configured to receive and output the fluid.