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Technical Specifications
Last Updated: 2026-10-08
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | FT90B |
| Category | Hobby |
| Performance | |
| Torque |
6.0V
20.84 oz-in
1.50 kg-cm
0.1 N-m
4.8V
18.06 oz-in
1.30 kg-cm
0.1 N-m
3.0V
13.89 oz-in
1.00 kg-cm
0.1 N-m
Below Average
|
| Speed |
6.0V
0.09 sec/60°
666.7 deg/s
111.1 RPM
4.8V
0.12 sec/60°
500.0 deg/s
83.3 RPM
3.0V
0.16 sec/60°
375.0 deg/s
62.5 RPM
Below Average
|
| Running Current |
6.0V
0.120 A
120 mA
4.8V
0.100 A
100 mA
3.0V
0.075 A
75 mA
Top 10%
|
| Stall Current | 0.4–0.8 A400–800 mAAverage |
| Physical | |
| Weight | 0.32 oz9.0 gAverage |
| Dimensions |
L 0.886 in W 0.476 in H 0.882 in L 22.5 mm W 12.1 mm H 22.4 mm |
| Case Material | Plastic |
| Drivetrain | |
| Motor Type | Brushed |
| Gears | Nylon |
| Gear Spline/Teeth | 21 T |
| Rotation Mode | Positional |
| Rotation/Support | Bushing |
| Control & Signal | |
| Modulation | Digital |
| Rotational Range | 180° |
| Mechanical Limit | 180° |
| Pulse Width | 500-2500 µs |
| Neutral Position | 1500 µs |
| Dead Band | 8 µs |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 3–6 V |
| Temperature | -20–70 °C-4–158 °F |
| Idle Current | 0.006 A6 mA |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 250 mm9.84 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
| Torque | Below Average Stronger than 14% of 328 Digital Micro servos at 3.0V |
| Speed | Below Average Faster than 12% of 328 Digital Micro servos at 3.0V |
| Weight | Average Lighter than 61% of 620 Digital Micro servos |
| Running Current | Top 10% Lower draw than 90% of 53 Digital Micro servos at 3.0V |
| Stall Current | Average Lower draw than 54% of 194 Digital Micro servos |
Performance Analysis
| Shaft Power | 0.16–0.43 W |
| Power Density | 1.151 W/in³ More power-dense than 23% of 590 Digital Micro servos |
| Torque Density | 1.5433 oz-in/g Stronger than 12% of 327 Digital Micro servos |
| Torque-to-Volume Ratio | 37.34 oz-in/in³ Denser torque than 11% of 327 Digital Micro servos |
| Speed-to-Weight | 0.69444 (1/sec·g) Faster than 43% of 327 Digital Micro servos |
| Speed-Torque Trade-off | 2.22 Better balanced than 31% of 327 Digital Micro servos |
| Current-per-Torque Ratio | 0.0576 A/oz-in More efficient than 23% of 85 Digital Micro servos |
| Idle-to-Running Current Ratio | 0.080 Lower idle draw than 36% of 37 Digital Micro servos |
| No-Load vs Stall Current Spread | 10.67 Narrower current spread than 26% of 36 Digital Micro servos |
| Torque Gain per Volt | 16.68%/V More voltage-responsive (torque) than 48% of 268 Digital Micro servos |
| Speed Gain per Volt | 25.93%/V More voltage-responsive (speed) than 88% of 273 Digital Micro servos |
| Voltage Range Width | 3.0 V Wider voltage range than 71% of 511 Digital Micro servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0040 Finer dead band than 5% of 189 Digital Micro servos |
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