Product Description
This listing gathers four core models of 9g digital servos, all compatible with mainstream PWM control signals to meet precise control requirements in different scenarios. Among them, SDS1601 is a metal gear with bearing model, supporting 8.4V high voltage drive, equipped with a coreless motor, balancing lightweight and precise control; SDS1901 features an all-metal structure, adapted to 8.4V high voltage, delivering 9kg torque, suitable for high-load competition scenarios; SDS009-002 is a metal gear upgrade version, with enhanced performance replacing SG90/EA08, ensuring stable operation; SDS009-001 is a cost-effective plastic gear model, equivalent to ES08 specifications, offering high torque and smooth operation. The four products cover different budget and performance needs, suitable for installation in models, robots and other equipment.
Product parameters
SDS1601 | |||
Control System | PWM | Amplifier Type | Digital Controller |
Gear Material | Quenched Steel | Housing Material | Engineering Plastic |
Spline | 25T-φ4.90mm | Bearing | Ball Bearing |
Neutral Position/Refresh Rate | 1520μsec/333Hz | Dead Band | 4μsec |
Pulse Width | 800-2000μsec | Operating Stroke | 130° |
Operating Voltage | 5.0V-8.4V | Operating Temperature | 10~50℃ |
Motor Type | Coreless Motor | Angle Sensor | Potentiometer |
Dimension | 24.3*12.0*22.3mm | Weight | 16g(0.560z) |
Stall Torque | 5.0kg-cm(69oz-in)@5.0V | ||
5.5kg-cm(76oz-in)@6.0V | |||
7.0kg-cm(97oz-in)@7.4V | |||
7.5kg-cm(104oz-in)@8.4V | |||
No-load Speed | 0.12sec/60°@5.0V | ||
0.10sec/60°@6.0V | |||
0.08sec/60°@7.4V | |||
0.07sec/60°@8.4V | |||

SDS1901 | |||
Gear Material | Metal | Housing Material | All Metal |
Output Gear | 25T-φ4.90mm | Bearing | Ball Bearing |
Dead Band | 2μsec | Neutral Position | 1500μsec |
Operating Temperature | 10~50℃ | Operating Stroke | 125° |
Pulse Width | 800-2200μsec | Motor Type | Coreless Motorr |
Dimension | 23.7*11.6*21.5mm | Weight | 19g |
Stall Torque | 6.8 kg-cm( 95 oz-in) @ 5.0V | ||
7.5 kg-cm(104 oz-in) @ 6.0V | |||
8.0 kg-cm(111 oz-in) @ 7.4V | |||
9.2 kg-cm(128 oz-in) @ 8.4V | |||
No-load Speed | 0.16sec/60°@ 5.0V | ||
0.13sec/60°@ 6.0V | |||
0.09sec/60°@ 7.4v | |||
0.07sec/60°@ 8.4V | |||

SDS009001 | |||
Gear Material | Plastic | Name | 9g Digital Servo |
Motor Type | Iron Core | Angle Sensor | Potentiometer |
Neutral Position/Refresh Rate | 800-2200μsec | Dead Band | 4μsec |
Operating Temperature | 10~50℃ | Operating Stroke | 150° |
Pulse Width | 800-2200μsec | Operating Voltage | 5-6V |
Dimension | 23*12*26mm | Weight | 9g |
Stall Torque | 5.0kg-cm(69oz-in)@5.0V | ||
5.5kg-cm(76oz-in)@6.0V | |||
7.0kg-cm(97oz-in)@7.4V | |||
7.5kg-cm(104oz-in)@8.4V | |||
No-load Speed | 0.12sec/60°@5.0V | ||
0.10sec/60°@6.0V | |||
0.08sec/60°@7.4V | |||
0.07sec/60°@8.4V | |||

SDS009002 | |||
Control System | PWM | Amplifier Type | Digital Controller |
Gear Material | Cooper Gear | Housing Material | Engineering Plastic |
Spline | 21T-φ4.90mm | Dead Band | 2μsec |
Neutral Position/Refresh Rate | 1520μsec/333Hz | Pulse Width | 800-2200μsec |
Operating Voltage | 5.0V-6.0V | Operating Stroke | 130° |
Motor Type | Iron Core | Operating Temperature | 10~50℃ |
Dimension | 23.0*12.0*26.0mm | Weight | 13g |
Angle Sensor | Potentiometer | ||
Stall Torque | 2.6kg-cm(85oz-in)@5.0V | ||
3.2kg-cm(99oz-in)@6.0V | |||
No-load Speed | 0.14sec/60°@5.0V | ||
0.12sec/60°@6.0V | |||

Product Display
SDS1601: Digital Servo, metal gear with bearing configuration, 8.4V high voltage coreless motor drive, compatible with SG90, focusing on lightweight and precise angle control, with accurate operation and low loss.
SDS1901:All-Metal Servo, 8.4V high voltage coreless motor + ball bearings, 9kg high torque output, robust and durable structure, suitable for competition-level high-load scenarios.
SDS009-001: Digital Servo, cost-effective plastic gear design, high torque and smooth operation, equivalent to ES08 specifications, suitable for budget-friendly scenarios.
SDS009-002: Metal Digital Servo, SG90/EA08 upgrade version, upgraded metal gear structure, stable and reliable operation, suitable for mainstream replacement needs.
Quality Control
This product undergoes rigorous quality control before leaving the factory. From the meticulous selection of core components to the high-precision manufacturing and assembly of the motor and gear train, every detail is ensured to be tight and reliable. Comprehensive performance testing precisely verifies torque, angular accuracy, and response speed, and verifies stability in harsh environments such as high and low temperatures, humidity, and vibration. All products undergo long-term endurance cycling and numerous electrical tests, including voltage, current, and electromagnetic compatibility tests, ensuring that each servo delivers superior performance and durability, providing you with a reliable and secure motion control experience.
Application Cases
These four 9g digital servos are widely used in fields such as RC aircraft (fixed-wing, UAV), vehicle/boat models, educational robots, and small motion actuators. Among them, SDS1601 is suitable for precise control of small RC aircraft and mini UAVs; SDS1901 is applicable to competition-level vehicle/boat models and joints of medium and large robots; SDS009-001 is ideal for entry-level models, teaching equipment and other cost-effective demand scenarios; SDS009-002 is compatible with conventional models and small equipment requiring SG90/EA08 replacement.
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