# MG90S metal gear micro servo: specs

> A micro servo from TowerPro with the specification table published on the maker's product page. The maker page does not give a pin or wire-colour…

[HTML version](https://soldr.ai/docs/components/mg90s)

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A micro servo from TowerPro with the specification table published on the maker's product page. The maker page does not give a pin or wire-colour table, a stall current or a PWM pulse range.

Every value cites its sourcePinout not published

[Buy on Compoden](https://compoden.com/products/mg90s-metal-gear-micro-servo-18kg-cm-torque)

## Specs

| Spec | Value | Source |
|---|---|---|
| Stall torque | 1.8 kg/cm at 4.8 V; 2.2 kg/cm at 6.6 V | source Specification |
| Operating speed | 0.10 s/60 degrees at 4.8 V; 0.08 s/60 degrees at 6.0 V | source Specification |
| Operating voltage | 4.8 V | source Specification |
| Temperature range | 0 to 55 C | source Specification |
| Dead band width | 1 us | source Specification |
| Weight | 13.4 g | source Specification |
| Dimensions | 22.8 x 12.2 x 28.5 mm | source Specification |
| Servo wire length and plug | 25 cm; JR type plug | source Specification |
| Power | Through external adapter | source Specification |

## Power

| | Value | Source |
|---|---|---|
| Supply | 4.8 V operating voltage; 4.8-6.6 V appears in the torque rows; power through an external adapter | source Specification |

## Pinout
We don't publish a pin table for this part: no official source we could verify gives one. Check the labels printed on your module, and see the notes below.

The maker page lists the plug as JR type but gives no wire colours or pin order; check the lead on the part.

## Build with it
Project ideas for the MG90S metal gear micro servo. Each link opens Soldr with the prompt filled in; Soldr assigns the pins, checks power and shows how to wire every part.

- [Pan and tilt camera mount](https://app.soldr.ai/?prompt=I%20want%20to%20build%20a%20pan%20and%20tilt%20mount%20with%20an%20ESP32%2C%20a%20PCA9685%20servo%20driver%2C%20two%20micro%20servos%20and%20a%20pan%20tilt%20bracket): Needs two servos (quantity 2). Do not power the servos from the ESP32 board; how the driver board takes servo power is read from its own labels, not from this page. Power: a 4 x AA holder gives about 6 V; check with a meter that the loaded voltage stays inside 4.8 V to 6.6 V (the maker's torque rows) and size the supply from the measured stall current, which the maker does not publish. Join the grounds. Learning project.
- [A keypad-controlled servo latch demo with an Arduino Uno, a 4x4 keypad and a micro servo](https://app.soldr.ai/?prompt=I%20want%20to%20build%20a%20keypad-controlled%20servo%20latch%20demo%20with%20an%20Arduino%20Uno%2C%20a%204x4%20keypad%20and%20a%20micro%20servo): The servo is fed from its own battery holder, not the Uno's 5 V pin. Power: a 4 x AA holder gives about 6 V; check with a meter that the loaded voltage stays inside 4.8 V to 6.6 V (the maker's torque rows) and size the supply from the measured stall current, which the maker does not publish. Join the grounds. Learning project, not a security product.
- [Servo current logger](https://app.soldr.ai/?prompt=I%20want%20to%20build%20a%20servo%20current%20logger%20with%20an%20ESP32%2C%20an%20INA219%20module%20and%20a%20micro%20servo): Measures the real current under load, which the maker page does not give. Put the INA219 in the servo supply line; the module's shunt rating must be above the stall current you expect (stall the servo only briefly). Power: a 4 x AA holder gives about 6 V; check with a meter that the loaded voltage stays inside 4.8 V to 6.6 V (the maker's torque rows) and size the supply from the measured stall current, which the maker does not publish. Join the grounds.
- [A servo angle control with an Arduino Uno, a 10k potentiometer and a micro servo](https://app.soldr.ai/?prompt=I%20want%20to%20build%20a%20servo%20angle%20control%20with%20an%20Arduino%20Uno%2C%20a%2010k%20potentiometer%20and%20a%20micro%20servo): The potentiometer sets the angle; the servo supply is separate from the Uno's. Power: a 4 x AA holder gives about 6 V; check with a meter that the loaded voltage stays inside 4.8 V to 6.6 V (the maker's torque rows) and size the supply from the measured stall current, which the maker does not publish. Join the grounds.

## Common mistakes

- The maker page says power comes through an external adapter, so do not run the servo from a development-board 5 V pin that also feeds other loads ([source](https://towerpro.com.tw/product/mg90s-3/)).
- The maker page gives torque only for 4.8 V and 6.6 V and speed only for 4.8 V and 6.0 V; do not assume performance above 6.6 V ([source](https://towerpro.com.tw/product/mg90s-3/)).
- No stall or running current is published on the maker page; measure it before choosing a supply (source: [link](https://towerpro.com.tw/product/mg90s-3/), no current row).

## Not covered by the official source

- No PDF datasheet from the maker; the product page is the only maker source.
- The page rows mix 6.6 V (torque) with 6.0 V (speed); both are quoted as written.
- Stall current, PWM pulse range and wire colours are not published there.
- The product name's 1.8 kg-cm matches the maker's 4.8 V torque.
- Sweep angle and PWM pulse range are not published on the maker page, so the ideas do not assume 180 degrees.

## Sources

- [link](https://towerpro.com.tw/product/mg90s-3/) (TowerPro MG90S product page, specification and configure table; maker's own web page, no PDF datasheet)