The Hirose DF59S-1P-FC(21) is a 1-position board-to-board adapter bridge from the DF59S series. It is not a standard header or receptacle — it serves as a conductive bridge between two parallel PCBs, letting you route a signal or low-power connection across a narrow gap without a cable or a multi-position connector. The single position means this part handles one circuit per bridge; multiple units can be placed side-by-side to match a multi-circuit board layout. Rated 3 A at 350 V, the bridge carries signal-level current and moderate voltage — enough for sensor lines, LED indicators, or low-power interconnects inside an enclosure. The push mount, snap-in installation means no soldering or additional hardware — the bridge presses into a corresponding hole in the PCB and locks in place. This speeds assembly and simplifies rework, but the mechanical retention relies on the snap feature, not a solder joint, so the board must have the correct hole diameter and thickness to hold securely.
The push mount, snap-in mounting type means the bridge is held by a mechanical latch, not solder. The board must have a mounting hole sized for the snap-in feature — typically a round or shaped cutout that the bridge's locking tabs engage.