The Hirose DF80D-40P-0.5SD(51) is a 40-position plug from the DF80 series, terminated by soldering discrete wires or ribbon cable directly to the contacts.
It matches the standard 0.5 mm FFC/FPC footprint, so this plug is compatible with 0.5 mm pitch receptacles and board-mount headers in the Hirose DF80 family. At 40 positions, the connector spans about 20 mm of cable width — a common count for parallel data or control buses.
Termination is solder — each contact is soldered to the stripped conductor of discrete wire or to the pads of a ribbon cable. The listed wire gauge range covers 32-36 AWG and 40-46 AWG, which means this plug handles both standard micro-coax (32 AWG) and ultra-fine wire (46 AWG) used in miniaturized assemblies. The closed-end feature prevents solder wicking beyond the contact zone.
That is a flash plating — adequate for occasional mating and unmating during assembly or field service.
The DF80D-30P-0.5SD(51) is the same plug in every dimension except position count — 30 positions instead of 40, at the same 0.50 mm pitch. If the BOM calls for 40 circuits, the 30-position part leaves 10 signals unconnected; if the design only needs 30, the 40-position plug wastes board space and cable width. Match the position count to the circuit count.