The invention relates to a current regulator having the following features: a first semiconductor body (1; 1') having a first and second terminal contact (11, 12), a transistor (T) having a control terminal and a load path, which is integrated in the semiconductor body (1; 1') and the load path of which runs between the terminal contacts (11, 12) of the semiconductor body, a current measuring resistor (22), which is at least partly formed by a section of the load path of the transistor, an evaluation and drive circuit (3), which is connected to the current measuring resistor (22) and which is designed to drive the transistor depending on a voltage across the measuring resistor (22).