LEMO

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LEMO 00 coaxial connectors on RG316 cable, below a BNC to LEMO adapter, a male to male adapter barrel and a 50 ohm terminator (topmost).

LEMO is both the name of an electronic and fibre optic connector manufacturer based in Switzerland, and the name commonly used to refer to connectors made by that company, which are used in medical, industrial, audio/visual, telecommunications, military, scientific research and measurement applications. The best known LEMO connectors are high quality push-pull circular types.

LEMO has set several connector standards, such as the 3K.93C connector for HDTV and the 00.250 connector for NIM and CAMAC.

The LEMO 00 is a standard adopted by the NIM and CAMAC standards used in nuclear and particle physics; it is a miniature push-pull coaxial, with a 50 ohm impedance, used both for analog and fast logic signals, as a replacement for BNC connectors in high-density designs.

While LEMO connectors were generally developed as proprietary designs, the legal status of many of the older designs is not clear. For example, the LEMO UK web site itself shows a standardization date of 1970 for the popular LEMO 00 model; any patent on that design should have expired around 1990 or earlier, depending on filing date and jurisdiction.