Millennium 3T-STD

The Birns Millennium 3T is an ultra-high performance, full-size connector, with up to 161 contacts. This exceptional series withstands open-face pressure to 3,000m (4,380 PSI) and was created specifically to push the technological barriers for challenges inherent in transmitting significant amounts of real time data for subsea observatories, towed data acquisition devices and ROV projects or any user of underwater electro-optical or coax cabling.

The Birns Millennium 3T is available with hybrid electro-optical and electro-coax options. This robust series provides distinct competitive advantages over other electro-optical connectors, as it can carry high and low voltages—a single connector can deliver power and control signals and high bandwidth telemetry both to and from a device.

The Birns Millennium 3T electro-coax hybrid segment includes GPS capabilities, as well as flexible solutions for high definition cameras and antennae for military and industrial applications.  This elevated level of capabilities and performance does not come at the cost of optical loss, however—the typical loss recorded for a cable assembly of the series is <1dB, in accordance with ANSI/TIA/EIA-455 for fiber optic return loss test procedures. Fiber optic configurations for the Millennium 3T may have different overall dimensions than standard Birns Millennium electrical connectors.

Both the electro-optical and electro-coax hybrid formats of the Birns Millennium 3T series can be made with special mounting configurations that can be designed to conform to MIL-C-24217/4-005 specs. This provides a seamless upgrade option for legacy equipment without necessitating costly comprehensive replacements.


Mated Depth
6000 m
-5°C to 60° C
Mechanical Load
500 kg
Voltage -STD
Insulation Resistance
300MΩ (min)
Optical – MM
≤ .2dB
Optical – SM
≤ .1dB