Mini Servo Motor SG90 9g Servo 180 Degree

The Tower Pro SG90 9g Mini Servo Motor is one of the most popular and widely used servo motors in the maker, hobbyist, and educational electronics communities. Designed as a lightweight, compact, and affordable solution for precise angular positioning, it has become the go-to actuator for countless DIY projects, robotics builds, and Arduino-based experiments.

The SG90 is a 180° rotation servo that can be precisely controlled to any angle within its range using a standard PWM (Pulse Width Modulation) signal — typically a 50Hz signal with pulse widths between 1ms (0°) and 2ms (180°). This makes it directly compatible with the Arduino Servo library, ESP32 PWM channels, Raspberry Pi PWM outputs, and dedicated servo controllers like the PCA9685.

Despite weighing only 9 grams, the SG90 packs an impressive stall torque of 1.5 kg/cm at 5V, enough to drive small mechanical loads such as robotic claws, camera gimbals, RC airplane control surfaces, and small pan-tilt mechanisms. Its nylon gear train provides reliable performance for typical hobby applications, while the integrated control circuitry offers precise positioning with a dead band width of just 10µs.

The servo features the standard 3-wire interface (Brown = GND, Red = +5V, Orange = Signal), making wiring straightforward for any project. Its small footprint (23 × 12.2 × 29 mm) allows easy mounting in tight spaces, while the included mounting horns and screws (typically supplied with the servo) make installation quick and convenient.

Specifications

• Model: Tower Pro SG90
• Type: Mini Servo Motor (Analog, 180° Rotation)
• Weight: 9 grams
• Dimensions: 23 × 12.2 × 29 mm
• Operating Voltage: 4.2V – 6V (typical: 5V)
• Stall Torque: 1.5 kg/cm @ 5V
• Working Torque: 0.5 kg/cm
• Operating Speed: 0.3 sec / 60° @ 4.8V
• Rotation Range: 180° (±90°)
• Dead Band Width: 10 µs
• Control Signal: PWM (50 Hz, 1–2 ms pulse width)
• Gear Material: Nylon (Plastic Gears)
• Operating Temperature: 0°C to +55°C
• Wiring:
  • Brown: Ground (GND)
  • Red: Positive Power (+5V)
  • Orange: PWM Signal Input
• Connector Type: Standard 3-Pin Female (JR/Futaba compatible)

Applications

• Robotic Arms & Manipulators — joint actuators for educational robots
• Pan-Tilt Camera Mounts — for cameras, sensors, and laser pointers
• RC Airplanes & Gliders — control surfaces (ailerons, elevators, rudders)
• RC Cars & Boats — steering mechanisms in micro-scale models
• Walking & Hexapod Robots — leg and joint actuators
• Smart Locks & Door Mechanisms — small actuator for DIY automation
• Animatronics & Puppetry — moving heads, eyes, and mouths
• Solar Tracking Systems — small-scale single-axis trackers
• Drone Payload Mechanisms — release hooks and gimbals
• Educational & STEM Kits — teaching servo control and PWM
• Interactive Art Installations — kinetic sculptures and exhibits
• Home Automation Projects — physical buttons, valve actuators, and curtain openers
• 3D Printed Mechanisms — popular actuator for printed robotics
• Arduino Beginner Projects — Sweep, Knob, and feedback control demos