Futaba S-A400

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*Spec is estimated from brand data.

Technical Specifications

Last Updated: 2026-10-24

Identity
Brand
Product Number	01102403-3
Category	Hobby
Performance
Torque	7.4V 111.10 oz-in 6.0V 100.00 oz-in Below Average
Speed	7.4V 0.08 sec/60° 6.0V 0.09 sec/60° Average
Physical
Weight	1.62 ozAbove Average
Dimensions	L 1.59 in W 0.79 in H 1.00 in
Drivetrain
Motor Type	Coreless
Gears	Metal
Gear Spline/Teeth	25 T estimate
Rotation/Support	Dual Bearings
Control & Signal
Modulation	Digital
Control System	SBUS2
Programmable	Yes
Electrical & Environment
Operating Voltage	6–7.4 V
Origin
Country of Origin	Japan

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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.

Compatible Hardware

Amazon eBay

*Spec is estimated from brand data.

Class Comparison

Torque	Below Average Stronger than 19% of 186 Digital Low Profile servos at 6.0V
Speed	Average Faster than 62% of 183 Digital Low Profile servos at 6.0V
Weight	Above Average Lighter than 73% of 304 Digital Low Profile servos

Performance Analysis

Shaft Power	2.05–2.57 W
Power Density	2.044 W/in³ More power-dense than 27% of 273 Digital Low Profile servos
Torque Density	2.1772 oz-in/g Stronger than 19% of 185 Digital Low Profile servos
Torque-to-Volume Ratio	79.61 oz-in/in³ Denser torque than 26% of 186 Digital Low Profile servos
Speed-to-Weight	0.24191 (1/sec·g) Faster than 71% of 182 Digital Low Profile servos
Speed-Torque Trade-off	9.00 Better balanced than 19% of 183 Digital Low Profile servos
Torque Gain per Volt	7.93%/V More voltage-responsive (torque) than 9% of 164 Digital Low Profile servos
Speed Gain per Volt	8.92%/V More voltage-responsive (speed) than 10% of 163 Digital Low Profile servos
Voltage Range Width	1.4 V Wider voltage range than 27% of 276 Digital Low Profile servos