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Technical Specifications
Last Updated: 2026-10-09
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | HD-1900A |
| Category | Hobby |
| Performance | |
| Torque |
6.0V
20.84 oz-in
1.50 kg-cm
0.1 N-m
4.8V
16.67 oz-in
1.20 kg-cm
0.1 N-m
Average
|
| Speed |
6.0V
0.08 sec/60°
750.0 deg/s
125.0 RPM
4.8V
0.11 sec/60°
545.5 deg/s
90.9 RPM
Above Average
|
| Running Current |
6.0V
0.140 A
140 mA
4.8V
0.130 A
130 mA
Average
|
| Stall Current | 0.67–0.83 A670–830 mABelow Average |
| Physical | |
| Weight | 0.32 oz9.0 gAverage |
| Dimensions |
L 0.91 in W 0.48 in H 1.08 in L 23.1 mm W 12.2 mm H 27.4 mm |
| Case Material | Plastic |
| Drivetrain | |
| Motor Type | Brushed |
| Gears | Plastic |
| Gear Spline/Teeth | 20 T estimate |
| Rotation Mode | Positional |
| Rotation/Support | Bushing |
| Control & Signal | |
| Modulation | Analog |
| Direction | Bidirectional |
| Rotational Range | 180° |
| Mechanical Limit | 180° |
| Pulse Cycle | 20 ms |
| Pulse Width | 800-2200 µs |
| Neutral Position | 1500 µs |
| Dead Band | 7 µs |
| Refresh Rate | 50 Hz |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 4.8–6 V |
| Temperature | -20–60 °C-4–140 °F |
| Idle Current | 0.005 A5 mA |
| Connectivity | |
| Connector | JR (Universal) estimate |
| Wire Length | 150 mm5.91 in |
| Origin | |
| Country of Origin | Hong Kong |
Disclaimer: Most data is sourced from the manufacturer. Some data is sourced from our loyal community and with the help of AI. We aim for accuracy but are not responsible for inaccurate information.
Class Comparison
| Torque | Average Stronger than 42% of 170 Analog Micro servos at 4.8V |
| Speed | Above Average Faster than 78% of 170 Analog Micro servos at 4.8V |
| Weight | Average Lighter than 41% of 346 Analog Micro servos |
| Running Current | Average Lower draw than 63% of 33 Analog Micro servos at 4.8V |
| Stall Current | Below Average Lower draw than 28% of 54 Analog Micro servos |
Performance Analysis
| Shaft Power | 0.28–0.48 W |
| Power Density | 1.021 W/in³ More power-dense than 66% of 333 Analog Micro servos |
| Torque Density | 1.8522 oz-in/g Stronger than 30% of 170 Analog Micro servos |
| Torque-to-Volume Ratio | 35.34 oz-in/in³ Denser torque than 18% of 170 Analog Micro servos |
| Speed-to-Weight | 1.01010 (1/sec·g) Faster than 57% of 170 Analog Micro servos |
| Speed-Torque Trade-off | 1.83 Better balanced than 36% of 169 Analog Micro servos |
| Current-per-Torque Ratio | 0.0498 A/oz-in More efficient than 34% of 45 Analog Micro servos |
| Idle-to-Running Current Ratio | 0.038 4th-highest idle-to-running current ratio of 23 Analog Micro servos |
| No-Load vs Stall Current Spread | 6.38 Narrower current spread than 29% of 25 Analog Micro servos |
| Torque Gain per Volt | 20.85%/V More voltage-responsive (torque) than 81% of 96 Analog Micro servos |
| Speed Gain per Volt | 31.24%/V 4th-highest speed gain per volt of 96 Analog Micro servos |
| Voltage Range Width | 1.2 V Wider voltage range than 69% of 182 Analog Micro servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0050 Finer dead band than 31% of 43 Analog Micro servos |
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Reviews (2)
-
Rex
December 17, 2024Application(s):
Comments: (From hobbyking.com) Very reliable for me. I have a set in a CTH Scythe I fly almost every day for 2 yrs now, 2-5 batteries a day 7min each and these servos are still working through 100's of crashes! I really can't believe they are still going. I have other planes with them and they are going great also. Great servo at a great price
Gramp
September 23, 2017Application(s): Swarm
Comments: This company has the worst datasheets in the world