Feetech ST-3025-C002 12V 40kg.cm Brushless Steel Gear TTL Servo

The Feetech ST-3025-C002 is a 12V brushless smart servo for robot joints, robotic arms, AGVs and automation rigs where a hobby PWM servo runs out of torque and feedback. It delivers 40 kg.cm peak stall torque through steel gears in an aluminium case, and is commanded over a half-duplex TTL serial bus instead of PWM.

Key features

• 12-bit magnetic encoder: 4096 positions across 360 degrees, about 0.088 degree resolution

• No mechanical end stop: angle servo mode (0-360 degrees), closed-loop speed mode for continuous rotation, step mode and multi-turn positioning

• Real-time feedback of position, speed, load, input voltage, current and temperature for monitoring and electronic protection

• Serial bus at 38400 bps to 1 Mbps, so many servos share one line, each on its own ID (1-253)

• Ball bearings and a 25T output spline (5.9 mm OD)

Specifications

• Operating voltage: 12 V nominal, can run directly from a 3S lithium pack

• Peak stall torque: 40 kg.cm at 12 V

• Rated torque: 10 kg.cm at 12 V

• No-load speed: 0.117 s/60 degrees (about 85 rpm) at 12 V

• No-load current: 380 mA at 12 V

• Stall current: 4.4 A at 12 V

• Size: 40 x 20 x 40 mm

• Weight: 89 g

• Lead length: 15 cm

• Operating temperature: -20 to 60 °C

The servo needs a half-duplex TTL serial interface on the controller side, such as a bus-servo driver board or a UART with direction control, rather than a PWM output. Size the 12 V supply for 4.4 A per servo at stall when several joints share it.