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Technical Specifications
Last Updated: 2026-10-21
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
Above Average
|
| 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 |
| Direction | Counterclockwise |
| 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 |
| 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 15% of 363 Digital Micro servos at 3.0V |
| Speed | Below Average Faster than 14% of 361 Digital Micro servos at 3.0V |
| Weight | Average Lighter than 62% of 665 Digital Micro servos |
| Running Current | Above Average Lower draw than 86% of 67 Digital Micro servos at 3.0V |
| Stall Current | Average Lower draw than 59% of 222 Digital Micro servos |
Performance Analysis
| Shaft Power | 0.16–0.43 W |
| Power Density | 1.151 W/in³ More power-dense than 25% of 625 Digital Micro servos |
| Torque Density | 1.5433 oz-in/g Stronger than 12% of 363 Digital Micro servos |
| Torque-to-Volume Ratio | 37.34 oz-in/in³ Denser torque than 11% of 359 Digital Micro servos |
| Speed-to-Weight | 0.69444 (1/sec·g) Faster than 48% of 361 Digital Micro servos |
| Speed-Torque Trade-off | 2.22 Better balanced than 30% of 358 Digital Micro servos |
| Current-per-Torque Ratio | 0.0576 A/oz-in More efficient than 18% of 108 Digital Micro servos |
| Idle-to-Running Current Ratio | 0.080 Lower idle draw than 31% of 50 Digital Micro servos |
| No-Load vs Stall Current Spread | 10.67 Narrower current spread than 32% of 51 Digital Micro servos |
| Torque Gain per Volt | 16.68%/V More voltage-responsive (torque) than 46% of 302 Digital Micro servos |
| Speed Gain per Volt | 25.93%/V More voltage-responsive (speed) than 85% of 305 Digital Micro servos |
| Voltage Range Width | 3.0 V Wider voltage range than 74% of 553 Digital Micro servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0040 Finer dead band than 5% of 220 Digital Micro servos |
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Reviews (1)
Includes 1 review aggregated from around the web.
There are very few reviews for this servo on the web. A Japanese maker who tried it as a cheaper SG90 replacement says it is cheaper than the SG90, works exactly as specified and is the better choice over the FS90 for that purpose.
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