SERVOMY SDS1901 SG90/MG90S Mini Size, 180 Degree HV Digital Coreless Servo

Typical Applications

• RC car steering
• Compact RC platforms
• Fixed-wing aircraft control surfaces
• Micro helicopter linkages
• Robotics and DIY motion control
• Pan-tilt mechanisms and small actuators

Product Description

The SERVOMY SDS1901 is a 9g-size(19G ACTUAL WEIGHT) micro servo built for users who need standard micro-servo mounting compatibility, higher voltage support, and stronger mechanical construction than entry-level plastic micro servos. It is designed to fit common 9g-size installation spaces while offering a full metal case, metal gears, digital control, and a coreless motor in a compact format.

With an operating voltage range of 5.0V to 8.4V, the SDS1901 works with common 5V, 6V, 7.4V, and 8.4V setups. At 8.4V, it provides up to 9.2 kgf·cm stall torque and 0.07 sec/60° speed. For RC car steering, small aircraft control surfaces, helicopter mechanisms, robotic joints, and pan-tilt assemblies, these are practical, meaningful specifications rather than marketing-only claims.

The digital control system uses PWM input, with a recommended operating pulse width of 1000-2000 μs and an input range of 500-2500 μs. Combined with a 2 μs dead band, 1520 μs neutral signal, and up to 333 Hz refresh rate, the servo is built for responsive command tracking and steady centering behavior.

Mechanically, the SDS1901 uses a full metal case, metal gears, 1 ball bearing, a 390:1 reduction ratio, and a 21T 4.9 mm output spline. The servo dimensions are 24 x 12 x 22 mm, with a weight of 19 g and a lead length of 310 ± 10 mm using 26 AWG wire. An aluminum servo horn is included in the package for added installation value.

This model is intended for users who want a compact servo that fits common 9g-size mounting spaces but need a more robust build and broader voltage compatibility than basic micro servo options.

Product Specifications

Model: SDS1901
Servo Type: Digital Micro Servo
Motor Type: Coreless
Operating Voltage: DC 5.0V-8.4V
Dimensions: 24 x 12 x 22 mm
Weight: 19 g
Case Material: Full Metal
Gear Material: Metal
Bearing: 1 Ball Bearing
Output Spline: 21T, 4.9 mm
Wire Length: 310 ± 10 mm
Wire Gauge: 26 AWG
Signal Wire: Yellow
Positive Wire: Red
Negative Wire: Brown
Control System: PWM
Recommended Pulse Width: 1000-2000 μs
Input Pulse Range: 500-2500 μs
Dead Band Width: 2 μs
Neutral / Refresh Rate: 1520 μs / 333 Hz
Rotation Direction: Forward / Reverse
Waterproof: No
Operating Temperature: -10°C to 50°C
Reduction Ratio: 390:1
Angle Sensor: Potentiometer

Speed（No-Load Speed）:

5.0V: 0.16 sec/60°

6.0V: 0.13 sec/60°

7.4V: 0.09 sec/60°

8.4V: 0.07 sec/60°

Stall Torque:

5.0V: 6.8 kgf·cm

6.0V: 7.5 kgf·cm

7.4V: 8.0 kgf·cm

8.4V: 9.2 kgf·cm

Package Includes

1 x SDS1901 Micro Servo

1 x Aluminum Servo Horn

1 x Servo Accessories Set