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Technical Specifications
Last Updated: 2026-10-26
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | RD-C7638HV-180 |
| Category | Robotics |
| Performance | |
| Torque |
8.4V
527.82 oz-in
38.01 kg-cm
3.7 N-m
7.2V
465.32 oz-in
33.51 kg-cm
3.3 N-m
5.0V
430.59 oz-in
31.01 kg-cm
3.0 N-m
Above Average
|
| Speed |
8.4V
0.10 sec/60°
600.0 deg/s
100.0 RPM
7.2V
0.12 sec/60°
500.0 deg/s
83.3 RPM
5.0V
0.14 sec/60°
428.6 deg/s
71.4 RPM
Average
|
| Physical | |
| Weight | 2.68 oz76.0 gBelow Average |
| Shape | Boxed |
| Dimensions |
L 1.575 in W 0.787 in H 1.575 in L 40.0 mm W 20.0 mm H 40.0 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Coreless |
| Gears | Stainless Steel |
| Gear Spline/Teeth | 25 T |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Rotational Range | 180° |
| Pulse Width | 500-2500 µs |
| Neutral Position | 1500 µs |
| Dead Band | 2 µs |
| Refresh Rate | 330 Hz |
| Electrical & Environment | |
| Operating Voltage | 5–8.4 V |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 265 mm10.43 in |
| Origin | |
| Country of Origin | Taiwan |
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 | Above Average Stronger than 87% of 1055 Digital Standard servos at 5.0V |
| Speed | Average Faster than 49% of 1038 Digital Standard servos at 5.0V |
| Weight | Below Average Lighter than 20% of 1872 Digital Standard servos |
Performance Analysis
| Shaft Power | 5.69–9.76 W |
| Power Density | 4.999 W/in³ More power-dense than 79% of 1762 Digital Standard servos |
| Torque Density | 5.6657 oz-in/g Stronger than 85% of 1048 Digital Standard servos |
| Torque-to-Volume Ratio | 220.56 oz-in/in³ Denser torque than 88% of 1053 Digital Standard servos |
| Speed-to-Weight | 0.09399 (1/sec·g) Faster than 30% of 1031 Digital Standard servos |
| Speed-Torque Trade-off | 60.28 Better balanced than 85% of 1029 Digital Standard servos |
| Torque Gain per Volt | 6.64%/V More voltage-responsive (torque) than 6% of 868 Digital Standard servos |
| Speed Gain per Volt | 11.76%/V More voltage-responsive (speed) than 25% of 868 Digital Standard servos |
| Voltage Range Width | 3.4 V Wider voltage range than 71% of 1552 Digital Standard servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0010 Finer dead band than 79% of 501 Digital Standard servos |
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