Overview
The FEETECH HL-3625 Servo Motor is a double shaft constant force serial bus servo designed for precise motion control in robotics and automation. It supports absolute position control over 360°, multi-loop operation, and configurable constant torque output, making it suitable for humanoid robots, robotic arms, exoskeletons, quadrupeds, and AGV platforms.
Key Features
- Model: HL-3625-C001; product name: 7.4V 25kg.cm Double Shaft Constant Force Serial Bus Servo
- Rated input voltage: 5V–8.4V; peak stall torque: 25kg.cm@7.4V
- Absolute position control from 0–360° with 0.088° resolution (360°/4096)
- Multi-loop mode: ±7 turns control at highest accuracy (number of turns not saved after power-off; resolution can be expanded)
- Operating modes: Angle servo mode (Mode 0), Motor constant speed mode (Mode 1), Motor constant current mode (Mode 2)
- Constant force output: set target torque (address 44) and the servo maintains this torque
- Serial bus control: Digital Packet over half duplex asynchronous serial; ID range 0–253; 38400bps ~ 1 Mbps
- Feedback: Load, Position, Speed, Input Voltage, Current, Temperature
- Copper gears, ball bearings, PA66+GF case; horn gear spline: 25T/OD5.9mm
- Gear ratio 1/345; connector wire 15CM; clockwise rotation (0→4096)
Specifications
| Parameter | Value |
|---|---|
| Model | HL-3625-C001 |
| Product Name | 7.4V 25kg.cm Double Shaft Constant Force Serial Bus Servo |
| Storage Temperature Range | -30℃~80℃ |
| Operating Temperature Range | -10℃~60℃ |
| Temperature Range | 25℃ ±5℃ |
| Humidity Range | 65%±10% |
| Size | A:45.2mm B:24.7mm C:35mm |
| Weight | 55± 1g |
| Gear type | Copper |
| Limit angle | NO limit |
| Bearing | Ball bearings |
| Horn gear spline | 25T/OD5.9mm |
| Gear Ratio | 1/345 |
| The rocker phantom | 0° |
| Case | PA66+GF |
| Connector wire | 15CM |
| Motor | Core Motor |
| Rated Input Voltage | 5V-8.4V |
| No load speed | 0.192sec/60°(52RPM)@7.4V |
| Runnig current(at no load) | 180mA@7.4V |
| Peak stall torque | 25kg.cm@7.4V |
| Stall current | 3.0A@7.4V |
| Rated Load | 6.2kg. cm@7.4V |
| Rated current | 750mA@7.4V |
| KT | 8.3kg. cm/A |
| Terminal resistance | 2.5 Ω |
| Operating Modes | Mode 0: Angle servo mode (default mode, absolute position controllable from 0-360 degrees); Mode 1: Motor constant speed mode (motor constant speed mode, maintains speed without deceleration as the load increases); Mode 2: Motor constant current mode (motor constant current mode,maintains current without decreasing with increasing load) can achieve absolute position |
| Multi-Loop Mode | control of positive and negative 7 turns at the highest accuracy, but the umber of power failure turns is not saved (the resolution can be expanded, and the number of turns can be doubled) |
| Constant force output | Set the output torque value, the servo can maintain this torque (input the target torque value corresponding to address 44, the servo can maintain this torque) |
| Command signal | Digital Packet |
| Protocol Type | Half Duplex Asynchronous Serial Communication |
| ID range | 0-253 |
| Communication Speed | 38400bps ~ 1 Mbps |
| Control Algorithm | PID |
| Neutral Position | 180°(2048) |
| Running degree | 360° (when 0~4096) |
| Resolution [deg/pulse] | 0.088°(360°/4096) |
| Rotating Direction | Clockwise(0→4096) |
| Feedback | Load, Position,Speed, Input Voltage,Current,Temperature |
Applications
- Humanoid Robots
- Robotic Arms
- Exoskeletons
- Quadruped Robots
- AGV Vehicles
- ARU Robots
Manuals
- SC-0090-C001 Serial Communication Specification
- HL3625-PRODUCT_SPECIFICATION.pdf
- HL3625_Product_structure_diagram.pdf
Details



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