SG90 Micro Servo Motor
The classic 9g micro servo — small, cheap, and perfect for any hobby mechanism.
The most common hobby servo in existence — 180° rotation, 9g weight, and near-universal library support across every microcontroller platform.
Specifications
| Operating voltage | 4.8V - 6V DC (5V typical) |
| Torque | ~1.8 kg·cm at 4.8V, ~2.2 kg·cm at 6V |
| Rotation | ~180° on most units (some batches are limited to 120° — test before mounting) |
| Speed | ~0.1 sec/60° at 4.8V, no-load |
| Control signal | PWM, 50Hz, ~1ms-2ms pulse width (1.5ms = center) |
| Weight | ~9g |
Pinout
| Pin | Name | Description |
|---|---|---|
| 1 | GND | Ground — usually the brown or black wire |
| 2 | VCC | Power, 4.8V-6V DC — usually the red wire |
| 3 | Signal | PWM control input — usually the orange or yellow wire |
Wire color order (GND-VCC-Signal vs Signal-VCC-GND) varies by manufacturer — check the connector keying, not just color, before powering on.
Variants
The SG90 is the default pick for small, light mechanisms — pan/tilt camera mounts, hobby claws, RC control surfaces — where its plastic gears and modest torque are enough. Swap to an MG90S if the same size servo needs to survive more repeated cycles under load, to a continuous-rotation servo if the mechanism needs to spin rather than hold an angle, or to an MG996R if the SG90 simply doesn't have enough torque for the job.
| Variant | Price |
|---|---|
| SG90 (this listing) | ~$1-3 |
| MG90S | ~$2-4 |
| Continuous rotation servo | ~$2-5 |
| MG996R | ~$3-6 |