TowerPro SG90 Mini Micro Servo, 90 Degree Rotation
by TowerPro

The TowerPro SG90 Digital Mini Micro Servo is the globally recognized benchmark for lightweight, high-utility micro actuation, serving as the digitally upgraded successor to the legendary SG90 analog classic. This ultra-compact, 9-gram servo delivers rapid positioning speeds and a solid $1.8\text{ kg/cm}$ torque rating at 4.8V, making it an indispensable mechanical component for micro-UAV control surfaces, multi-rotor subsystems, and experimental mechatronics assemblies. Engineered with precision polyoxymethylene (POM) plastic gears and a coreless 3-pole motor, the SG90 Digital operates across a standard 4.8V to 6.0V range, accepting standard PWM control signals from microcontrollers like Arduino, Raspberry Pi, ESP32, or standard RC flight receivers.

While commonly referred to as a 90-degree servo under standard RC receiver pulse boundaries (1.0ms to 2.0ms), the SG90 Digital's internal mechanics are fully capable of achieving a wide 150-degree to 180-degree physical rotation by simply expanding the PWM input signal range (from approximately 500µs to 2400µs). This outstanding flexibility addresses the requirements of several distinct, high-tech domains:

• FPV & RC Aviation: Drone pilots and fixed-wing modelers utilize the sub-10g footprint to actuate aileron/elevator control surfaces, deploy lightweight micro-flaps, or drive smooth camera pan/tilt gimbal mechanisms.

• STEM Education & Academic Research: Due to its immense popularity and low cost, the SG90 acts as the ultimate hands-on instructional hardware for teaching students the core principles of closed-loop feedback, angular position mathematics, and pulse-width modulation (PWM) control.

• Commercial sUAS & Tactical Prototyping: Aerospace developers and defense contractors deploy this miniature actuator as a low-risk, dependable device for quick-release utility payloads, camera shroud positioning, wind-tunnel scale testing models, and tactical, low-signature auxiliary systems.

Technical Specifications

• Model Identification: TowerPro SG90 Digital Micro Servo (SG90-7)

• Operating Modulation: Digital (upgraded from analog for superior holding torque, faster centering, and immediate response)

• Dead Band Width: 1 µs

• Operating Speed (4.8V No Load): 0.10 seconds / 60°

• Stall Torque (4.8V): $1.8\text{ kg/cm}$ (25.0 oz-in)

• Operating Voltage Range: 4.8V to 6.0V

• Typical Operating Current: 0.5A to 2.0A

• Gear Train Material: High-rigidity POM (Polyoxymethylene) plastic gear set

• Motor Technology: Coreless, 3-pole brushed motor

• Rotational Range: ~90° (with default 1ms–2ms PWM pulses); expandable up to 150°–180° (using 500µs–2400µs range)

• Signal Interface Plug: JR Universal Type (natively fits JR, Futaba, Hitec, Spektrum, and standard hobby receivers)

• Connector Cable Length: 25 cm (250 mm)

• Wiring Color Code: Brown (Negative / Ground), Red (Positive / VCC), Orange (PWM Signal)

• Physical Dimensions: 23.0 mm x 12.2 mm x 29.0 mm

• Unit Weight: 9.0 grams (housing only) / 10.6 grams (including full wire harness)

What Is Included

• (1) Genuine TowerPro SG90 Digital 9g Micro Servo with 25cm JR Connector Cable

• (3) White POM Plastic Servo Horn Arms (1x Single Arm, 1x Dual-Sided Arm, 1x Cross-Shaped Arm)

• (3) Solder-Free Mounting and Servo Arm Attachment Screws