Futaba RS204MD

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Technical Specifications

Last Updated: 2026-10-26

Identity
Brand
Product Number	00400098-3
Category	Robotics
Performance
Torque	5.0V29.16 oz-in
Speed	5.0V0.19 sec/60°
Running Current	5.0V0.060 A
Stall Current	≤0.5 ATop 10%
Physical
Weight	0.42 ozTop 10%
Shape	Boxed
Dimensions	L 1.10 in W 0.63 in H 0.94 in
Drivetrain
Motor Type	Cored
Gears	Plastic
Rotation Mode	Positional
Control & Signal
Rotational Range	300°
Pulse Cycle	50 ms
Pulse Width	560-2480 µs
Neutral Position	1520 µs
Refresh Rate	250 Hz
Control System	TTL / PWM
Programmable	Yes
Electrical & Environment
Operating Voltage	3.7–6 V
Temperature	0–40 °C
Idle Current	0.010 A
Connectivity
Connector	ADH
Wire Length	70 mm
Baud Rate	9.6 Kbps–230 Kbps
Origin
Country of Origin	Japan

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*Based on known specs.

Class Comparison

Weight	Top 10% Lighter than 95% of 697 Mini servos
Stall Current	Top 10% Lower draw than 95% of 118 Mini servos

Performance Analysis

Shaft Power	0.28 W
Power Density	0.436 W/in³ More power-dense than 13% of 207 Futaba servos
Torque Density	2.4300 oz-in/g
Torque-to-Volume Ratio	44.76 oz-in/in³
Speed-to-Weight	0.43860 (1/sec·g)
Speed-Torque Trade-off	5.54
Current-per-Torque Ratio	0.0171 A/oz-in
Idle-to-Running Current Ratio	0.167
No-Load vs Stall Current Spread	8.33
Voltage Range Width	2.3 V Wider voltage range than 66% of 162 Futaba servos