The 031-70526-13: This impedance is standard for video, broadcast, and telecommunications signal paths, distinct from the 50 Ohm impedance common in RF/microwave test equipment. The connector is rated to 12 GHz maximum frequency, well above the typical 1-4 GHz ceiling of most 75 Ohm BNCs, making it suitable for high-definition video distribution and high-speed data links that push beyond the traditional BNC band. The lockwasher and nut are the panel-mount hardware for the bulkhead — front side nut mounting feature, so you do not need to order those separately. The connector ships in bulk packaging.
Mounting: Board Edge or Panel — One Connector, Two Jobs
This BNC jack supports two mounting styles: board edge, end launch for direct PCB mounting, and panel mount with a bulkhead front side nut. The end launch orientation places the connector at the edge of the PCB, with the signal path running parallel to the board surface — a common layout for coaxial I/O on a line card or test board. This dual mounting flexibility means the same part number can serve either a PCB-edge design or a panel-feedthrough requirement, reducing the number of line items on the BOM.
12 GHz Bandwidth at 75 Ohm — What That Means on the Bench
The 12 GHz frequency rating is unusually high for a 75 Ohm BNC. Most 75 Ohm BNC connectors are specified to 1-4 GHz, limited by the impedance match and the physical geometry of the interface. This connector's 12 GHz rating means it can carry signals well into the microwave region while maintaining the 75 Ohm impedance — useful for high-definition serial digital interface (HD-SDI) video at 3 Gbps, or for 10 Gbps data-over-coax links that push into the 6-12 GHz range. The 500 mating cycles are a practical limit for field-service reconnect duty; the connector is not designed for hundreds of daily lab reconnections, but it will hold up through a reasonable number of install-and-test cycles.
How It Compares: 031-70526-13 vs 031-70016
The closest sibling in the Amphenol 031-70 series is the 031-70016, also a 75 Ohm BNC jack with 500 mating cycles and nickel-plated brass body. The key difference is frequency: the 031-70526-13 is rated to 12 GHz, while the 031-70016 is rated to 4 GHz. The 031-70016 also specifies a cable group (RG-179, 179A, 179B, 187, 187A, Belden 9221, M17/94-RG179) and uses a crimp shield termination, whereas the 031-70526-13 uses a solder shield termination and does not list a cable group. If your application needs the full 12 GHz bandwidth or you prefer solder termination, the 031-70526-13 is the correct choice. If you are terminating a specific 75 Ohm coax cable and want a crimp termination, the 031-70016 may be a better fit.
The 031-70526-13 is listed with an active lifecycle status. Confirm the BOM position for the 75 Ohm impedance and the 12 GHz requirement before specifying.