BNC vs SDI new


BNC is a plug format, SDI is a signal transport format.

One uses a BNC connector for a variety of equipment such as television cables, and radios. In addition to that, BNC connects with SDI to allow extended signal bandwidths. On the other hand, SDI is an interface type used on high definition signals. Thus, it is essential to find a BNC connector that has a perfect fit or dimensions with the SDI you are utilizing.

Definition: SDI vs. BNC Cables

BNC or Bayonet Neil Concelman is a connector type that is commonly used on coaxial cables. The ends of basic BNC cables are mounted with male-type connectors. Notably, it has a pin that connects to the cable conductor found at the center.

The rotating ring found on the outside of the BNC cable tube can lock to female connectors. This connector is usually found on monitors. It aims to increase the signal accuracy especially those sent by the video adapter.

15946105964_752e3ee383_o BNC vs SDI
Two HD SDI-video cables – Photo credit: By Danil Roudenko from

On the other hand, SDI or Serial Digital Interface are commonly used to transmit uncompressed and unencrypted video signals. Moreover, broadcasting standard and high definition signals use this interface type. These can come along with audio and video signals.

The facilities for broadcasting primarily uses this interface type. In addition to that, it includes closed captions, test signals, and content identification.

BNC Connectors on SDI

SDI is a transport format of the signal while BNC is a connector format. SDI utilizes coaxial cables which commonly entail the use of a BNC plug.

SDI carries 16 channels of pulse-code modulation or PCM audio and uncompressed video that is digital in nature. It transmits on a coaxial cable at 75 Ohms connected with BNC.

As the signal’s bandwidth can extend on the gigahertz range, SDI cables can no longer handle this. It must use a proper BNC connector to handle this digital signal. Nevertheless, BNC connectors may come in different dimensions. Thus, we recommend you find a BNC connector that properly connects to SDI.

Despite its usefulness, the major disadvantage of utilizing SDI is that there are a number of devices for prosumer and consumers that do not support it. Nonetheless, there are manufacturers that use converter boxes to convert SDI signals. SDI has limited resolutions which it can support.

In general, it is essential to have a supporting BNC connector to your SDI cable to allow higher signal bandwidth. Additionally, most of the users connect these two connectors by soldering or securing the locks.


In summary, different kinds of equipment such as radios and televisions use BNC that are coaxial cable connectors. It has a single pin in the center of the connector. Furthermore, SDI uses this cable to accommodate signals that require high bandwidth. A variety of equipment uses this interface for the transmission of uncompressed or unencrypted digital signals.

Utilizing SDI alone is not advisable as you need a BC connector for signals with high bandwidth. Thus, it is important to find a proper fit of the BNC connector to SDI as there are different dimensions for this type.

The listing below on Amazon will help you choose the best one for yourself: