A heat exchanger having a heat exchanger core which is configured as a plate stack has a flange plate including at least one upper partial plate facing the heat exchanger core and at least one lower partial plate facing away from the heat exchanger core. The flange plate can include a supercooling passage which is bounded by at least one partial plate in the stacking direction of the partial plates and which receives a flow of refrigerant during the operation of the heat exchanger. A high variability can be provided thanks to the compact and flexible design, by means of which the most diverse of requirements can be achieved with no major design changes.