# ROBOTIS DYNAMIXEL MX-28AT

> ROBOTIS DYNAMIXEL MX-28AT smart servo: Maxon coreless motor + 193:1 metal gearbox + ARM Cortex-M3 72 MHz controller + 12-bit AS5045 absolute encoder, 2.5 N·m stall / 55 rpm no-load at 12 V (10–14.8 V), velocity, position, multi-turn and PWM modes, TTL bus on a 3-pin Molex connector, 35.6 × 50.6 × 35.5 mm, 77 g.

- Manufacturer: ROBOTIS
- Part number: MX-28AT
- Category: Actuators
- Canonical page: https://www.xirkit.io/products/robotis-dynamixel-mx-28at-5e78
- Pinout: https://www.xirkit.io/products/robotis-dynamixel-mx-28at-5e78/pinout
- Structured JSON: https://www.xirkit.io/products/robotis-dynamixel-mx-28at-5e78/data.json
- Source: Xirkit structured parts catalog — every value traced to a cited document; unknowns are explicit.

## Key specifications

| Property | Value |
| --- | --- |
| Actuator type | smart_servo |
| Gearbox | 193:1 |
| Peak torque | 2.5 N·m |
| No-load speed | 55 rpm |
| Rated voltage | 14.8 V |
| Torque constant Kt | 1.786 N·m/A |
| Backlash | 0.33° |
| Encoder | contactless absolute magnetic, 12-bit (4096 pulse/rev), ams AS5045 |
| Control interface | TTL |
| Control modes | velocity, position, extended position (multi-turn), PWM |
| Dimensions | 35.5 × 35.6 × 50.6 mm |
| Operating temperature | -5 to 80 °C |

## Pinout (3 pins, 0 with electrical limits)

| Pin | Position | Kind | Chip pad | Functions | VIH | VIL | VOH | VOL | IOH | IOL | 5 V tolerant |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| GND | MOLEX 22-03-5035 · TTL-1 | ground | — | ground | — | — | — | — | — | — | — |
| VDD | MOLEX 22-03-5035 · TTL-2 | power in | — | power_in | — | — | — | — | — | — | — |
| DATA | MOLEX 22-03-5035 · TTL-3 | signal | — | data | — | — | — | — | — | — | — |

## Where to buy

| Supplier | Price | Stock | Checked | URL |
| --- | --- | --- | --- | --- |
| robotis.us | 333.39 USD | in_stock | 2026-10-01 | https://robotis.us/products/dynamixel-mx-28at |

## FAQ

**What voltage powers the ROBOTIS DYNAMIXEL MX-28AT?**

Supply range 10–14.8 V.

**How much does the ROBOTIS DYNAMIXEL MX-28AT cost?**

From $333.39 at robotis.us. Prices are observed unit prices before tax and shipping.

**What are the ROBOTIS DYNAMIXEL MX-28AT dimensions?**

35.5 × 35.6 × 50.6 mm. A STEP model is available for enclosure fit checks.

**Where does this ROBOTIS DYNAMIXEL MX-28AT data come from?**

Every value in this record is traced to a source — 2 documents including the board and chip datasheets — with the page and table cited per value. Unknowns are left explicit, never guessed.

## Sources

- [ROBOTIS DYNAMIXEL MX-28AT datasheet](https://emanual.robotis.com/docs/en/dxl/mx/mx-28-2/)
- [robotis.us listing](https://robotis.us/products/dynamixel-mx-28at)

## Part graph

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