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HS-7940TH Servo

  • HS-7940TH with quarter for scale
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This product has been discontinued on ServoCity.  Hitec's fastest standard size servo the "Ultra Speed" HS-7940TH is designed to operate on a two cell LiPo Pack. Featuring high resolution "G2" second generation programmable digital circuit and indestructible Titanium gears, The HS-7940TH has the performance and durability you've come to expect from a Hitec servo. Other features in the HS-7040TH include a 7.4V optimized coreless motor, integrated heat sink case, and a top case with two hardened steel gear pins supported by axial brass bushing.  

The HS-7940TH has been designed for applications where speed and response are demanded. Perfect for High Performance Nitro and Electric Helicopters, Aircraft, Cars, and Trucks. Featuring a blistering transit time of .07 sec, but still maintaining a respectable 181 oz./in. of torque at 6.0 volts.


Programmable Features:
- Dead Band Width
- Direction of Rotation
- Speed of Rotation (slower)
- End Points
- Neutral Points
- Fail Safe On/Off
- Fail Safe Points
- Resolution (default is set at high)
- Overload Protection (default is off)

Dimensions 1.57" x 0.79"x 1.50" (40 x 20 x 38mm)
Product Weight 2.40oz (68g)
Output Shaft Style 24 tooth (C1) spline
Voltage Range 4.8V - 7.4V
No-Load Speed (4.8V) 0.08 sec/60°
No-Load Speed (6.0V) 0.07 sec/60°
No-Load Speed (7.4V) 0.06 sec/60°
Stall Torque (4.8V) 144.8oz/in. (
Stall Torque (6.0V) 180.5oz/in. (
Stall Torque (7.4V) 222oz/in. (
Max PWM Signal Range (Standard) 750-2250μsec
Travel per µs (out of box) .080°/μsec
Travel per µs (reprogrammed normal res) .133°/μsec
Travel per µs (reprogrammed high res) .073°/μsec
Max Travel (out of box) 119.5°
Max Travel (reprogrammed normal res) 199.5°
Max Travel (reprogrammed high res) 109.5°
Pulse Amplitude 3-5V
Operating Temperature -20°C to +60°C
Current Drain - idle (4.8V) 9mA
Current Drain - idle (6.0V) 9mA
Current Drain - no-load (4.8V) 220mA
Current Drain - no-load (6V) 300mA
Current Drain - stall (4.8V) 3.8A
Current Drain - stall (6V) 4.8A
Continuous Rotation Modifiable Yes
Direction w/ Increasing PWM Signal Clockwise
Deadband Width 2µs
Motor Type Coreless Carbon Brush
Potentiometer Drive 6 Slider Indirect Drive
Internal Feedback Style 5KΩ Potentiometer
Output Shaft Support Dual Ball Bearing MR106
Gear Type Straight Cut Spur
Gear Material Titanium
Wire Length 7" (178mm)
Wire Gauge 22AWG

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