Compact Hybrid Connectors Simplify Humanoid Robot Joint Wiring

Molex has introduced a compact hybrid connector platform designed to carry power and high-speed communications through space-constrained robotic joints and actuators. The architecture combines power contacts rated up to 15 A with 1000BASE-T1 Ethernet communication at 1 Gbps in a single interface for humanoid robots, autonomous mobile robots (AMRs) and advanced industrial automation systems.

The design targets a practical manufacturing problem emerging as robotic systems move toward higher-volume production: routing power and control communications through increasingly compact articulated mechanisms without relying on multiple connectors or extensive manual wiring.

Compact Connectivity for Articulated Robot Joints
Multi-axis robotic assemblies such as wrists, elbows, knees, ankles and neck mechanisms typically contain actuators, sensors and control electronics within limited mechanical space. These components require both electrical power and communication links while maintaining freedom of movement.

Using separate power and signal connectors increases the routing space required inside these mechanisms. Where conventional connectors cannot pass through internal openings, manufacturers may instead route individual wires and terminate or solder them during final assembly. This adds assembly operations and introduces additional termination points.

The new Molex connector consolidates these functions into one wire-to-board interface. It supports power delivery of up to 15 A alongside 1 Gbps 1000BASE-T1 Ethernet, allowing actuator power and control data to share a compact connection system.

A 5.65 mm routing profile enables pre-terminated cable assemblies to pass through narrow internal channels in actuators, articulated limbs, robotic joints and end-effectors. Molex states that this configuration requires up to 50% less routing area than alternative approaches.

The smaller routing requirement is particularly relevant to humanoid robot architectures because reducing the number of separately routed cables can simplify mechanical packaging and assembly.

Power and Ethernet Share a Single Interface
1000BASE-T1 provides 1 Gbps Ethernet communication and is designed around a single balanced twisted pair. Within robotic architectures, this type of connection can carry control and sensor information between distributed electronics while the separate power contacts in the same connector interface supply the associated actuator or subsystem.

Combining these functions does not mean that power and Ethernet use the same electrical contacts. Instead, the connector packages dedicated power and data contacts within one mechanical interface.

This arrangement can reduce the number of individual connector housings and cable terminations required at each robotic joint. For systems containing many articulated axes, those reductions can accumulate across the complete wiring architecture.

Vertical and Right-Angle Configurations Support Dense Packaging
The connector family is available in vertical and right-angle mating orientations. These options allow designers to select the cable exit direction according to available PCB and enclosure space.

Right-angle configurations can be used where cables need to run parallel to a circuit board or actuator housing, while vertical connections support layouts where the mating interface is positioned perpendicular to the PCB.

Controlling cable exit direction can also reduce bending immediately behind the connector, an important consideration in assemblies exposed to repeated movement.

Molex describes the mechanical construction as vibration-resistant and designed for continuous motion and repeated flexing. This targets applications where electrical connections are subjected to movement throughout the operating life of a robot.

Pre-Terminated Assemblies Target Production Scaling
One of the main manufacturing objectives is to replace manual wire routing and termination with pre-terminated cable assemblies.

In conventional compact joints, individual conductors may need to be threaded through small mechanical openings before terminals are soldered or otherwise attached during final assembly. A connector assembly capable of passing through a 5.65 mm routing path allows termination to take place earlier in the manufacturing process.

The completed harness can subsequently be routed through the actuator or joint and connected during system assembly.

This approach supports plug-and-play subassemblies and can reduce the number of manual termination operations required during final robot integration.

The issue becomes more significant as actuator counts increase. Molex cites a 2026 McKinsey & Company supply-chain analysis indicating that joint actuator systems can account for approximately 40% to 60% of a humanoid robot's bill of materials. The company also points to humanoid architectures incorporating approximately 50 articulated joint actuators.

At that scale, connector dimensions, harness weight, termination methods and assembly time become system-level manufacturing considerations rather than isolated component choices.

Connectivity Across Robot Compute, Sensors and Motion Systems
The hybrid connector forms part of Molex's broader connectivity architecture for humanoid robots, AMRs and industrial automation.

At the compute level, the company offers high-density Mirror Mezz mezzanine connectors for high-speed interfaces, including platforms based on the NVIDIA Jetson Thor module.

For distributed sensing, Molex provides Quad-Row board-to-board connectors and High-Speed FAKRA-Mini interconnects intended for applications including spatial vision, LiDAR and tactile sensor arrays.

Higher-current portions of robotic power distribution can use Mega-Fit and EXTreme Ten60 connector systems, while the compact hybrid interface addresses power and communications closer to articulated actuators and other mechanically constrained subsystems.

Together, these connector categories address the different electrical requirements between central AI processing, perception systems and distributed mechanical motion.

Production Planned for Late 2026
Molex is providing samples and functional evaluation assemblies for customer design-in and joint evaluation.

Full commercial production scaling is scheduled for late 2026, positioning the connector family for robotic platforms progressing from prototype development toward larger production volumes.

Additional Context:
This section details technical specifications and competitive benchmarking not included in the original product announcement

Hybrid power-and-signal connectivity is already used in industrial motors, automation equipment and transportation systems, but available solutions vary substantially in current capacity, data capability, environmental protection and physical dimensions.

TE Connectivity's Motorman hybrid connector, for example, integrates power, signal and data in one rectangular housing. TE states that the architecture can reduce housing size and cable requirements by up to 50% and shorten cable length by up to 70%. The system supports Cat5e communications and IP65 environmental protection. Its design is aimed primarily at decentralized industrial automation rather than routing through extremely narrow articulated robot joints.

Hirose's BH12 provides another measurable reference point for hybrid connectivity. It combines two 20 A power contacts with lower-current signal contacts in a connector with a 13.8 mm plug diameter and supports IPX6/IPX7 protection when mated. The BH12 therefore provides higher specified current capacity than Molex's 15 A interface, while its published 13.8 mm connector diameter illustrates the different packaging priorities between waterproof industrial or mobility connectors and the 5.65 mm routing profile targeted by the Molex design.

Hirose also offers the ix Industrial interface for compact industrial Ethernet applications. The connector supports Cat5e transmission at 1 Gbps and Cat6A transmission at up to 10 Gbps, and Hirose specifies a 75% size reduction compared with conventional RJ45 solutions. Unlike the Molex hybrid architecture, however, ix Industrial is primarily a compact data interface rather than an integrated 15 A power-and-Ethernet connection.

These products are therefore not direct functional equivalents. Their published specifications demonstrate the engineering trade-off involved in robotic interconnect design: higher current capacity, environmental sealing, higher data rates and minimum routing dimensions impose different mechanical requirements. Molex's design specifically prioritizes the combination of 15 A power, 1 Gbps single-pair Ethernet and a 5.65 mm routing profile for constrained robotic joints and actuators.

Edited by Sucithra Mani, Induportals editor – adapted by AI.

www.molex.com