FEETECH STS3215 7.4V 19.5kg.cm Serial Bus Smart Servo – 1:345 Gear Ratio (C001)

The FEETECH STS3215 is an intelligent serial bus servo built for advanced robotic systems requiring significantly more control and feedback than a conventional PWM hobby servo. The C001 version uses a 1:345 gear ratio and delivers up to 19.5kg.cm stall torque at 7.4V.

Its built-in magnetic encoder provides absolute 360° position sensing, while the serial communication interface allows the controller to command and receive information from the servo. Multiple servos can also be used on a shared serial bus, making the STS3215 particularly suitable for multi-joint robotic systems.

Key Features
Model: FEETECH STS3215 / ST-3215-C001
Operating voltage: up to 7.4V for the specified performance
Gear ratio: 1:345
Stall torque: 19.5kg.cm @ 7.4V
Rated torque: 5kg.cm @ 7.4V
Maximum speed: 52RPM @ 7.4V
Stall current: approximately 2.5A @ 7.4V
Rated current: approximately 650mA @ 7.4V
Position sensing: Magnetic encoder
Position range: 360°
Resolution: 4096 positions / approximately 0.088° per step
Gear material: Metal/copper gear train
Communication: Serial bus
Feedback: Position, speed, load, voltage, current and temperature
Dimensions: approximately 45.2 × 24.7 × 35mm
Weight: approximately 55g
Protection: Overload and over-current protection
Multiple operating modes: Position/servo, continuous rotation and step modes.
Smart Feedback & Control

Unlike a basic hobby servo that mainly receives a position command, the STS3215 can return operating information to the controller. This includes position, load, speed, voltage, current and temperature, making it useful for robotics projects that require monitoring and closed-loop system behaviour.

360° Magnetic Encoder

The integrated magnetic encoder provides absolute position measurement across 360°. The servo uses a 4096-position representation of a full revolution, corresponding to a maximum position resolution of approximately 0.088°.

High-Torque 1:345 Gear Train

This particular C001 / 1:345 version prioritises torque, producing up to 19.5kg.cm at 7.4V. This makes it particularly useful for joints and mechanisms where holding and moving heavier loads is more important than achieving extremely high rotational speed.

Applications

Suitable for:

Robotic arms and manipulators
Humanoid robots
Quadruped and walking robots
Educational robotics
Multi-servo robotic systems
Pan-and-tilt mechanisms
Automated mechanisms
Research prototypes
Smart actuators
DIY robotics projects

FEETECH specifically identifies applications such as quadruped robots, snake robots, desktop robots, humanoid robots and mechanical arms for this servo platform.

Important: This is a serial bus smart servo, not a conventional 3-wire PWM hobby servo. Your controller/interface and software should support the appropriate FEETECH serial communication protocol.