DS3225 25kg High-Torque Digital Servo Motor – 180°, Metal Gear, IP66

The DS3225 180° Digital Servo Motor is a high-torque standard-size servo designed for robotics, robotic arms, RC vehicles, steering mechanisms and other applications requiring powerful and precise position control.

It delivers up to approximately 25 kg·cm stall torque at 6.8V and features a durable metal gear system, dual bearings, digital PWM control and an aluminum middle housing for improved heat dissipation.

With its 180° controllable rotation range and IP66-rated construction, the DS3225 is an excellent choice for demanding robotics and RC projects.

Technical Specifications

• Model: DS3225
• Servo Type: Digital High-Torque Servo
• Rotation Range: 180°
• Operating Voltage: 4.8–6.8V DC
• Stall Torque @ 5V: 21 kg·cm
• Stall Torque @ 6.8V: 24.5–25 kg·cm
• Operating Speed @ 5V: 0.15 sec/60°
• Operating Speed @ 6.8V: 0.13 sec/60°
• Stall Current @ 5V: Approx. 1.9A
• Stall Current @ 6.8V: Approx. 2.3A
• Control Method: PWM
• Pulse Width Range: 500–2500µs
• Neutral Position: 1500µs
• Operating Frequency: 50–330Hz
• Dead Band: 3µs
• Gear Ratio: 275:1
• Gear Type: Metal
• Bearing: Dual Bearing
• Output Spline: 25T
• Cable Length: Approx. 300mm
• Water Resistance: IP66
• Dimensions: Approx. 40 × 20 × 40.5mm
• Weight: Approx. 60g
• Operating Temperature: -15°C to +70°C
• Storage Temperature: -30°C to +80°C

High Torque – Up to 25 kg·cm

The DS3225 provides powerful output for a standard-size servo.

At 5V:

21 kg·cm Stall Torque

At 6.8V:

Approx. 25 kg·cm Stall Torque

This makes it suitable for applications requiring considerably more torque than common hobby servos such as the SG90 or MG996R.

180° Position Control

This version provides approximately:

0–180° Controllable Rotation

using a standard PWM servo control signal.

The servo is designed for position control, meaning the controller sends a target position and the internal electronics automatically drive the motor toward that position.

It is not a continuous-rotation servo.

Fast Digital Response

Operating speed is approximately:

0.15 sec/60° @ 5V

0.13 sec/60° @ 6.8V

The digital control electronics provide fast response and precise positioning for robotics and RC applications.

PWM Control

The DS3225 uses standard servo-style PWM control.

Typical control parameters:

• Pulse Range: 500–2500µs
• Center Position: 1500µs
• Operating Frequency: 50–330Hz
• Dead Band: 3µs

This makes it straightforward to control using many microcontrollers and dedicated servo controllers.

Arduino & ESP32 Compatible

The DS3225 can be controlled by:

• Arduino UNO
• Arduino Nano
• Arduino Mega
• ESP32
• ESP8266
• Raspberry Pi with Suitable PWM Control
• STM32
• PCA9685 Servo Controllers
• RC Receivers
• Dedicated Robot Controllers

Important Power Supply Requirement

The DS3225 is a high-current servo and should normally be powered from a dedicated external power supply.

Stall current can reach approximately:

1.9A @ 5V

and:

2.3A @ 6.8V

Do not power the servo directly from an Arduino or ESP32 5V/3.3V pin.

Use a suitable external 5–6.8V power supply capable of providing sufficient current.

When using an external supply with a microcontroller:

Servo Power → External Power Supply

Servo Ground → External Power Supply Ground

Microcontroller Ground → Same Common Ground

Servo Signal → Microcontroller PWM/GPIO

A common ground between the controller and servo power supply is required.

Metal Gear Construction

The DS3225 uses a durable metal gear system designed to withstand higher mechanical loads than small plastic-gear servos.

This makes it particularly suitable for:

• Robot Joints
• Steering Systems
• Robotic Arms
• Grippers
• RC Crawlers
• Mechanical Linkages

Dual Bearing Design

The output mechanism uses dual bearings to improve shaft support and reduce unwanted movement under mechanical load.

This is especially useful in applications where the servo experiences significant radial or side loads.

IP66 Water-Resistant Construction

The DS3225 is specified with an IP66 protection rating.

This provides protection against dust and strong water jets when the servo is correctly assembled.

However, IP66 does not mean the servo should be permanently submerged underwater.

Applications

Ideal for:

• Robotic Arms
• Robot Joints
• Robot Grippers
• Humanoid Robots
• Quadruped Robots
• Hexapod Robots
• RC Cars
• RC Crawlers
• RC Trucks
• RC Boats
• Steering Mechanisms
• Pan/Tilt Systems
• Mechanical Automation
• University Robotics Projects
• DIY Robotics

Important Torque Note

The 25 kg·cm rating is stall torque, not the recommended continuous operating torque.

For reliable operation, the servo should normally be used below its maximum stall load.

As an approximate torque relationship:

25 kg·cm ≈ 2.45 N·m

This does not mean the servo can safely hold a 25kg object at any distance.

Torque decreases with increasing lever-arm length. Mechanical geometry, acceleration, servo horn length and safety margin must all be considered when selecting a servo.

Important Notes

• This version provides 180° position control.
• Operating voltage is 4.8–6.8V DC.
• Do not exceed 6.8V unless your exact servo version is specifically rated for a higher voltage.
• Use a dedicated high-current power supply.
• Do not power the servo directly from a microcontroller's GPIO or low-current regulator.
• Always connect controller and servo power-supply grounds together.
• 25 kg·cm is a stall torque specification, not continuous working torque.
• IP66 does not mean the servo is designed for continuous underwater operation.
• Avoid forcing the servo beyond its mechanical travel.

Package Includes

• 1 × DS3225 25kg 180° Digital Servo Motor
• Servo Horn / Arm
• Mounting Hardware