SG90 9g micro servo in blue housing with three white servo horns and mounting screws

SG90 9g Micro Servo - 90°, 180° and 360° Options

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$4.49 NZD
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SG90 9g micro servo in blue housing with three white servo horns and mounting screws
  • SG90 9g micro servo in blue housing with three white servo horns and mounting screws
  • SG90 servo kit breakdown showing the servo, three horn arms, mounting screws and the 3-pin connector
  • SG90 servo wiring diagram: brown negative supply, red positive supply, orange PWM signal
  • SG90 micro servo size dimensions in millimetres with servo horn arm measurements
  • Close-up of the SG90 micro servo with the case open showing its plastic gear train and brass motor pinion
SG90 9g Micro Servo - 90°, 180° and 360° Options
SKU: SRV-SG90-9G-90

SG90 9g Micro Servo - 90°, 180° and 360° Options

$4.49 NZD
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Rotation Angle
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The SG90 is a compact 9 g servo for Arduino, RC and robotics projects. Choose 90° for a short positional arc, 180° for standard angle control, or 360° for continuous rotation. All three options use the same 3-wire connection, body and mounting pattern, and each comes with horns and screws.

Specifications

90° - Short positional arc

Moves through a 90° arc and holds position. Its useful Arduino range is typically write(90) to write(180).

180° - Standard positional

Moves to a commanded angle and holds it across a full 180° sweep. This is the version most tutorials and projects expect.

360° - Continuous rotation

Turns continuously in either direction. The signal controls speed and direction, not shaft angle, with neutral around 1500 µs.

Technical details
ModelSG90 9 g micro servo
Rotation options90°, 180° or 360°
Gear typePlastic
Operating voltage4.8 to 6 V DC
Control signal50 Hz PWM, 3-wire
Connector3-pin JR / Futaba style
90° controlTypically 1500 to 2000 µs
180° controlTypically 500 to 2500 µs
360° controlNeutral around 1500 µs; either side sets direction and speed
SpeedAbout 0.1 s per 60°
Stall torqueAbout 1.6 kgf·cm at 4.8 V; 1.8 kgf·cm at 6 V
CurrentAbout 5 to 10 mA idle, 100 to 250 mA running, up to 700 mA stalled
Body size23.0 × 12.0 × 22.8 mm
Mounting span32.2 mm across the tabs
Lead lengthAbout 25 cm
WeightAbout 9 g
Wire coloursBrown GND, red V+, orange signal
Controller logic3.3 V or 5 V signal

Datasheets

SG90 technical datasheet All three rotation options PDF

What's in the box

1×
SG90 servo in your selected rotation option

Includes three servo horn arms and mounting screws.

Great for

Robot arms and grippers

Use the 180° option for repeatable position control.

Steering and control surfaces

The 180° option suits RC and small mobile projects.

Latches and short linkages

The 90° option covers mechanisms that only need a short arc.

Drive wheels and rovers

Use 360° when you need continuous forward and reverse motion.

Rotating displays and conveyors

The 360° option controls direction and speed.

Arduino and STEM projects

A compact servo for prototypes, kits and classroom builds.

Wiring & getting started

  1. Connect the three wires

    Brown goes to GND, red to a regulated 4.8 to 6 V supply, and orange to the controller's signal pin.

  2. Share the ground

    If the servo has a separate power supply, connect its ground to the Arduino, ESP32 or receiver ground.

  3. Use the right control range

    For 90°, start with write(90) to write(180). For 180°, use write(0) to write(180). End points vary slightly between units, so test the travel before fitting the horn to a loaded mechanism.

  4. Set neutral on the 360° option

    write(90) or about 1500 µs should stop it. If it creeps, adjust the neutral value slightly until the shaft stays still.

  5. Allow enough current

    One unloaded servo can be tested from a development board's 5 V pin. For a loaded servo or several servos, use a separate regulated supply with a common ground.

Frequently Asked Questions

Answers to the questions buyers ask most.

Can I use the SG90 with Arduino?
Yes. Use the built-in Servo library, with brown to GND, red to 4.8 to 6 V, and orange to a signal pin. No separate driver board is needed.
What is the difference between the 90°, 180° and 360° options?
The 90° and 180° options move to a commanded position and hold it. The 90° option covers a shorter arc. The 360° option turns continuously, so the command sets speed and direction instead of an angle.
Which rotation option should I choose?
Choose 180° for most tutorials, robot arms, steering and other projects that need position control. Choose 90° for a short linkage or latch. Choose 360° for wheels, conveyors or displays that need to keep turning.
How do I control the 90° option?
With the Arduino Servo library, its useful range is typically write(90) to write(180). Test the end points on your unit before fitting the horn to a loaded mechanism, and avoid driving it against the mechanical stops.
Why will the 360° option not hold an angle?
It is a continuous-rotation servo, so it does not provide position control. Around write(90), or 1500 µs, is neutral. Values either side set direction and speed. Adjust neutral slightly if the shaft creeps.
Can I power it from an Arduino 5 V pin?
One unloaded servo is usually fine for a quick test. For a loaded servo or several servos, use a separate regulated 4.8 to 6 V supply and connect its ground to the controller ground.
What is included?
One SG90 servo in your selected rotation option, three servo horn arms and mounting screws.

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