Feetech STS3020 7.4V 20kg.cm Metal Gear Serial Bus Servo

The Feetech STS3020 is a TTL serial bus smart servo for robot arms, humanoids, quadrupeds and other multi-servo builds. Copper gears, ball bearings and an aluminium case carry the load, while a 12-bit magnetic encoder and PID control give precise, repeatable positioning.

Key features

• 22.5kg.cm stall torque at 7.4V (19.2kg.cm at 6V), 7.5kg.cm rated
• 1:275 gear ratio with backlash of 0.5° or less
• 12-bit magnetic encoder: 4096 positions over 360° (0.088° per step), no angle limit
• Configurable ID (0-253) and baud rate (38,400 bps to 1 Mbps) for long daisy chains
• Copper gears in an aluminium case with a 25T, 5.9mm OD horn spline

Specifications

• Operating voltage: 7.4V
• Stall torque: 22.5kg.cm at 7.4V; 19.2kg.cm at 6V
• Rated torque: 7.5kg.cm at 800mA
• No-load speed: 0.149 s/60° (67 RPM) at 7.4V
• Current: 32mA idle, 240mA no-load, 2.4A stall
• Torque constant: 8.7kg.cm/A
• Motor: cored DC motor
• Interface: half-duplex asynchronous serial (TTL), digital packet
• Cable length: 150mm
• Dimensions: 40.2 x 20.2 x 40mm
• Weight: 61.7g (±1g)
• Operating temperature: -10 to 60°C

Run it from a regulated 7.4V supply sized for 2.4A per servo at stall. A half-duplex TTL bus adapter lets one PC or microcontroller UART drive the whole chain.