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Technical Specifications
Last Updated: 2026-10-23| 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
|
| 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
|
| Running Current |
6.0V
0.140 A
140 mA
4.8V
0.130 A
130 mA
|
| 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 | Clockwise |
| Rotational Range | 165° |
| 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 | 4.5–6 V |
| Temperature | -20–50 °C-4–122 °F |
| Idle Current | 0.005 A5 mA |
| Connectivity | |
| Connector | JR (Universal) estimate |
| Wire Length | 150 mm5.91 in |
| Origin | |
| Country of Origin | China |
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
| Weight | Average Lighter than 49% of 336 Analog Micro servos |
| Stall Current | Below Average Lower draw than 34% of 48 Analog Micro servos |
Performance Analysis
| Shaft Power | 0.28–0.48 W |
| Power Density | 1.021 W/in³ More power-dense than 68% of 322 Analog Micro servos |
| Torque Density | 1.8522 oz-in/g |
| Torque-to-Volume Ratio | 35.34 oz-in/in³ |
| Speed-to-Weight | 1.01010 (1/sec·g) |
| Speed-Torque Trade-off | 1.83 |
| Current-per-Torque Ratio | 0.0498 A/oz-in |
| Idle-to-Running Current Ratio | 0.038 |
| No-Load vs Stall Current Spread | 6.38 |
| Voltage Range Width | 1.5 V Wider voltage range than 90% of 174 Analog Micro servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0050 Finer dead band than 34% of 42 Analog Micro servos |
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Reviews (6)
Includes 4 reviews aggregated from around the web.
There are few reviews for this servo on the web. A European retailer shows 5.0 from 4 verified reviews, describing it as fast, precise, with no backlash, and a very good price for the quality. No failures were reported.
-
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