BNC Jack, 75 Ohm — Right-Angle Board-Mount
It carries a bayonet lock for quick quarter-turn mating and unmating — the standard BNC interface used across video distribution, broadband, and test equipment. The single-port female socket accepts the matching BNC plug with a 75 Ohm impedance path, rated to 3 GHz. The centre contact is phosphor bronze with gold plating, and the shell is zinc with a nickel finish. The dielectric is PTFE, giving stable impedance through the signal path. Contact and shield termination are both solder — the centre pin solders into the PCB, and the shield legs solder to ground planes.
Signal Path and Deployment Context
The 75 Ohm impedance sets this BNC apart from the 50 Ohm RF standard — it is the impedance for composite video (SDI), CCTV, and broadband data systems where the characteristic impedance of the cable and the connector must match to avoid reflections. The 3 GHz bandwidth covers HD-SDI (1.485 Gbps) and 3G-SDI (2.97 Gbps) signal rates with margin. The 500 V rating is the dielectric withstand between centre conductor and shell, not a continuous operating voltage for active signal lines — the practical limit is the driver output voltage. The solder-shield termination ties the braid to the ground plane directly at the connector, keeping the ground return path short. The bayonet lock provides positive retention without tools — the slot-and-pin interface pulls the plug into the jack as it rotates.