A radio frequency (RF) power transistor includes a semiconductor heterostructure, a gate electrode, a drain electrode and a source electrode. The drain electrode includes an ohmic contact and a Schottky contact extending from the ohmic contact toward the gate electrode, spaced apart from the gate electrode (4) by a distance (LGD), and having a length (LEXT) being not less than 2 μm and not greater than 4 μm. A ratio of the length (LEXT) to a sum of the length (LEXT) and a distance (LGD) is greater than 0.83 and less than 0.98.