Futaba S-A400

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*Spec is estimated from brand data.

Technical Specifications

Last Updated: 2026-10-10

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
Control & Signal
Modulation	Digital
Control System	PWM / SBUS2
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 21% of 136 Digital Low Profile servos at 6.0V
Speed	Average Faster than 57% of 135 Digital Low Profile servos at 6.0V
Weight	Above Average Lighter than 67% of 251 Digital Low Profile servos

Performance Analysis

Shaft Power	2.05–2.57 W
Power Density	2.044 W/in³ More power-dense than 33% of 215 Digital Low Profile servos
Torque Density	2.1772 oz-in/g Stronger than 21% of 136 Digital Low Profile servos
Torque-to-Volume Ratio	79.61 oz-in/in³ Denser torque than 30% of 136 Digital Low Profile servos
Speed-to-Weight	0.24191 (1/sec·g) Faster than 64% of 135 Digital Low Profile servos
Speed-Torque Trade-off	9.00 Better balanced than 23% of 134 Digital Low Profile servos
Torque Gain per Volt	7.93%/V More voltage-responsive (torque) than 8% of 115 Digital Low Profile servos
Speed Gain per Volt	8.92%/V More voltage-responsive (speed) than 11% of 117 Digital Low Profile servos
Voltage Range Width	1.4 V Wider voltage range than 23% of 223 Digital Low Profile servos