Power HD High-Speed Digital Sub-Micro Servo DSP33

The DSP33 from Power HD is a very fast sub-micro servo with digital control electronics for increased performance. At just 3 g, it is one of the smallest and lightest servos we carry, making it a great tiny actuator for robotic or RC mechanisms that need to be quick and very light.


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The tiny DSP33 from Power HD is a high-speed sub-micro servo with digital control electronics for increased performance. Weighing in at under 3 g, it is one of the smallest and lightest sub-micro servos we carry, making it a great actuator for small robot mechanisms or weight-sensitive applications. This servo features a light, 3"-long cable terminated by a special ZH-style JST connector with a 1.5mm pitch. This connector is intended for very light receivers like the Spektrum AR6300 and is also sometimes referred to as a micro JST or miniJST connector.

Note: This servo’s connector will not work directly with standard 0.1" servo receptacles. Also, this type of connector has ground as the middle pin, which differs from standard servo cables. The signal pin is the grey wire.

Servo horns and associated hardware are included, though the hardware might vary from what is shown in the picture below.

Power HD high-speed digital sub-micro servo DSP33 with U.S. quarter for size reference

Power HD high-speed digital (sub-)micro servo DSP33/DSM44 included hardware (might vary)

The servo’s gears are plastic for reduced weight. Note that, as with most hobby servos, stalling or back-driving this servo can strip its gears.



Size: 20 x 8.7 x 22 mm
Weight: 3 g

General specifications

Digital?: Y
Speed @ 6V: 0.07 sec/60°
Stall torque @ 6V: 0.35 kg·cm
Speed @ 4.8V: 0.09 sec/60°
Stall torque @ 4.8V: 0.3 kg·cm
Lead length: 7 cm
Hardware included?: Y
Maximum storage temperature: 60 °C
Maximum operating temperature: 50 °C


What are the three wires coming out of my servo?

Pololu - Common RC servo connectors. From left to right: Futaba, JR, Airtronics Z

Most standard radio control servos (and all RC servos we sell) have three wires, each a different colour. Usually, they are either black, red, and white, or they are brown, red, and orange/yellow:

  • brown or black = ground (GND, battery negative terminal)
  • red = servo power (Vservo, battery positive terminal)
  • orange, yellow, white, or blue = servo control signal line

Please check the specs for your servo to determine the proper power supply voltage, and please take care to plug the servo into your device in the proper orientation (plugging it in backwards could break the servo or your device).

How many degrees can this servo turn? Why do you not list it with the other specifications?

We do not specify the range of rotation of our servos because this information is not generally available from servo manufacturers. RC servos are usually intended for controlling things like the steering mechanism in an RC car or the flaps on an RC plane. Manufacturers make sure that the range is enough for these typical applications, but they do not guarantee performance over a wider range.

This means most RC servos will rotate about 90° using the standard 1–2 ms pulse range used by most RC receivers. However, if you are using a controller capable of sending a wider range of pulses, many servos can rotate through almost 180°.

You can find a servo’s limits if you use a servo controller that can send pulses outside of the standard range (such as our Maestro servo controllers). To find the limits, use the lowest possible supply voltage at which the servo moves, and gradually increase or decrease the pulse width until the servo does not move any further or you hear the servo straining. Once the limit is reached, immediately move away from it to avoid damaging the servo, and configure your controller to never go past the limit.

You might be wondering why we do not just follow the above steps for all the servos we carry and list a specification for degrees of rotation. Unfortunately, since servo manufacturers do not specify the range of rotation, it might change from one manufacturing run to the next. They will not inform us about changes that are not specified, and we have no way of knowing if or when they might change their manufacturing process.

For more information about servos and how to control them, we recommend the series of blog posts on servos starting with: Introduction to servos.

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