In one embodiment, an optoelectronic semiconductor device includes at least two lead frame parts and an optoelectronic semiconductor chip which is mounted in a mounting region on one of the lead frame parts. The lead frame parts are mechanically connected to one another via a casting body. The semiconductor chip is embedded in the cast body. In the mounting region the respective lead frame part has a reduced thickness. An electrical line is led over the cast body from the semiconductor chip to a connection region of the other of the lead frame parts. In the connection region, the respective lead frame part has the full thickness. From the connection region to the semiconductor chip the electrical line does not overcome any significant difference in height.