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Technical Specifications
Last Updated: 2026-09-16
|
Identity
Performance
Physical
Drivetrain
Control & Signal
Electrical & Environment
Connectivity
Origin
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Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | 37990S |
| Category | Hobby |
| Discontinued | Yes |
| Performance | |
| Torque |
7.4V
611.00 oz-in
44.00 kg-cm
4.3 N-m
6.0V
500.00 oz-in
36.00 kg-cm
3.5 N-m
|
| Speed |
7.4V
0.17 sec/60°
352.9 deg/s
58.8 RPM
6.0V
0.21 sec/60°
285.7 deg/s
47.6 RPM
|
| Running Current | (add) |
| Stall Current | 8.1–9.9 A8100–9900 mA |
| Physical | |
| Weight | 2.79 oz79.0 g |
| Dimensions |
L 1.72 in W 0.88 in H 1.58 in L 43.8 mm W 22.4 mm H 40.0 mm |
| Case Material | Plastic / Aluminum |
| Drivetrain | |
| Motor Type | Coreless |
| Motor Drive | FET |
| Gears | Titanium |
| Gear Spline/Teeth | 25 T |
| Shaft Size | (add) |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Backlash | 0.500° |
| Control & Signal | |
| Modulation | Digital |
| Direction | Clockwise |
| Rotational Range | 90° |
| Mechanical Limit | 300° |
| Pulse Cycle | (add) |
| Pulse Width | 1050-1950 µs |
| Neutral Position | 1500 µs |
| Dead Band | 2 µs |
| Refresh Rate | (add) |
| Angle Sensor | Magnetic Encoder |
| Control System | PWM |
| Programmable | Yes |
| Signal Voltage | (add) |
| Electrical & Environment | |
| Operating Voltage | 6–7.4 V |
| Power Source | 2S LiPo |
| Regulator Type | (add) |
| Temperature | -20–60 °C-4–140 °F |
| Water Rating | IP54 |
| Certification | (add) |
| Idle Current | 0.023 A23 mA |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 300 mm11.81 in |
| Origin | |
| Country of Origin | (add) |
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.
Performance Analysis
| Shaft Power | 4.40–6.65 W |
| Torque Density | 6.3291 oz-in/g Stronger than 89% of the 832 Digital Standard servos in the database |
| Torque-to-Volume Ratio | 208.78 oz-in/in³ Denser torque than 83% of the 843 Digital Standard servos in the database |
| Power Density | 2.775 W/in³ More power-dense than 56% of the 1644 Digital Standard servos in the database |
| Speed-to-Weight | 0.06028 (1/sec·g) Faster than 2% of the 821 Digital Standard servos in the database |
| Speed-Torque Trade-off | 105.01 Better balanced than 97% of the 826 Digital Standard servos in the database |
| Current-per-Torque Ratio | 0.0198 A/oz-in More efficient than 36% of the 231 Digital Standard servos in the database |
| Torque Gain per Volt | 15.86%/V More voltage-responsive (torque) than 50% of the 673 Digital Standard servos in the database |
| Speed Gain per Volt | 16.80%/V More voltage-responsive (speed) than 61% of the 687 Digital Standard servos in the database |
| Voltage Range Width | 1.4 V Wider voltage range than 38% of the 1269 Digital Standard servos in the database |
| Backlash-to-Range Ratio | 0.00556 Tighter backlash than 31% of the 27 Hobby servos in the database |
| Dead-Band-to-Pulse-Width Ratio | 0.0022 Finer dead band than 11% of the 327 Digital Standard servos in the database |
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