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Power HD Sub-Micro Servo HD-1440A

Odysseia International Ltd.

Power HD Sub-Micro Servo HD-1440A

Country/Region China
City & Province Hong Kong
Categories Toy Parts

Product Details

The HD-1440A analog servo from Power HD is one of the smallest servos we carry and is a great, inexpensive, tiny actuator for a small robot mechanism. Servo horns and associated hardware are included.
Key specs at 6 V: 0.10 sec/60°, 14 oz-in (1.0 kg-cm), 4.3 g.

This is a great general-purpose actuator for tiny mechanisms. The lead is terminated with a standard "JR"-style connector, which is Futaba-compatible. Mounting screws and an assortment of servo horns is included with this servo (hardware might vary). You can find more information about this servo under the specifications tab and in its datasheet (176k pdf).

Note that, as with most hobby servos, stalling or back-driving this servo can strip its gears.

An example of hardware included with the Power HD sub-micro servo HD-1440A and the sub-micro servo 3.7g (generic). Actual hardware might vary.

Note: The case of this servo has changed from translucent blue to solid black (pictures of the two versions are available under the pictures tab).


Size:20.2 x 22.2 x 8.5 mm
Weight:4.3 g

General specifications

Free-run current @ 6V:110 mA
Stall current @ 6V:320 mA
Speed @ 6V:0.10 sec/60°
Stall torque @ 6V:1.0 kgcm
Speed @ 4.8V:0.12 sec/60°
Stall torque @ 4.8V:0.8 kgcm
Lead length:4 in
Hardware included?:Y

File downloads

Datasheet for the Power HD sub-micro servo HD-1440A(176k pdf)

FAQs 1. What are the three wires coming out of my servo?

Most standard radio control servos (and all RC servos we sell) have three wires, each a different color. 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).

2. 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 transmitters. 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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