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D955TW Servo

  • D955TW with quarter for scale
  • D955TW included hardware
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The power of Hitec’s D-Series servos continues with the introduction of the next Premium Class trio: the D930SW, D954SW and D955TW. As with our entire “D” line, these technologically-advanced servos are powered by our 32-bit MCU (Microcontroller Unit) and 12-bit ADC (Analog to Digital Converter) industrial science and possess Smart Sense engineering with rapid, high resolution response. Their unprecedented programmability and wide-voltage capabilities deliver the most progressive, leading-edge performance for all your radio control needs. The reliably-strong titanium-geared D955TW replaces the well-known HS-7955TH.


  • Programmable PWM Digital Amplifier
  • 32-Bit MCU with 12-Bit ADC Circuitry
  • 4096 Resolution
  • 1M Cycle Long Life Potentiometer
  • Wide Operating Voltage (4.8 ~ 8.4 Volts DC)
  • Dual Ball Bearing Supported Output Shaft
  • 25-Tooth Output Spline
  • Coreless Metal Brush Motors
  • Nylon Reinforced Plastic Upper and Lower Case
  • Diamond Cut Aluminum Heat Sink Center Case
  • Dust Resistant and Splash Proof Case

Programmable Features:

  • End Point Adjustments
  • Direction
  • Fail Safe
  • Dead Band
  • Speed (Slower)
  • Soft Start Rate
  • Overload Protection
  • Data Save / Load
  • Program Reset
Dimensions 1.57" x 0.78" x 1.46" (40.0 mm x 20.0 mm x 37.0 mm)
Product Weight 2.33 oz (66.0 g)
Output Shaft Style 25 tooth (H25T) spline
Voltage Range 4.8 V - 7.4 V
No-Load Speed (4.8V) 0.19 sec/60°
No-Load Speed (7.4V) 0.12 sec/60°
Stall Torque (4.8V) 251 oz-in. (18.07
Stall Torque (7.4V) 404 oz-in. (29.09
Max PWM Signal Range (Standard) 850-2350 μsec
Travel per µs (out of box) .097°/μsec
Travel per µsec (reprogrammed) 0.132°/μsec
Max Travel (out of box) 146°
Max Travel (reprogrammed) 198°
Pulse Amplitude 3-5 V
Operating Temperature -20°C to +60°C
Continuous Rotation Modifiable Yes
Direction w/ Increasing PWM Signal Clockwise
Deadband Width 1 µs
Motor Type Coreless Metal Brush
Internal Feedback Style 5KΩ Potentiometer
Output Shaft Support Dual Ball Bearing
Gear Type Straight Cut Spur
Gear Material Titanium
Wire Length 13" (330.2 mm)
Wire Gauge 20 AWG

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