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Unit 1 - 6115 4 St SE
Calgary AB  T2H 2H9

NEMA-17 Bipolar 20mm Stepper

ID: 3305_0

This compact bipolar stepper has a 1.8° step angle and 450 g·cm of torque at low speeds.


Replaced by the 3324_0, a similar stepper motor.

This motor is a NEMA-17 motor that is only 20mm long. Great for projects where space is restricted and that do not require too much torque.

Product Specifications

Motor Properties
Motor Type Bipolar Stepper
Manufacturer Part Number 39BYG013
Step Angle 1.8°
Step Accuracy 5 %
Holding Torque 550 g·cm
Rated Torque 450 g·cm
Maximum Speed (w/1063 Motor Controller) 600 RPM
Maximum Motor Speed 4530 RPM
Acceleration at Max Speed
(w/1067 Motor Controller)
400000 1/16 steps/sec²
Electrical Properties
Recommended Voltage 12 V DC
Rated Current 400 mA
Coil Resistance 6.8 Ω
Phase Inductance 6.5 mH
Physical Properties
Shaft Diameter 5 mm
Mounting Plate Size NEMA - 17
Weight 110 g
Number of Leads 4
Wire Length 300 mm
Customs Information
Canadian HS Export Code 8501.10.00
American HTS Import Code 8501.10.40.60
Country of Origin CN (China)

The 3305 stepper motor connects to a bipolar motor controller such as the 1067 - PhidgetStepper Bipolar HC.

The following diagrams show how to connect the motor wires to the board connectors to produce a clockwise rotation in the stepper motor when increasing position. Refer to whichever diagram matches your motor's wire colors. To wire for counter-clockwise rotation when increasing position, reverse the C and D wires.


Note: Make sure to unplug the power cord from the motor controller before switching wires around.


warning Connecting the motor directly to a power supply will destroy the motor and void the warranty. If you want to check your motor make sure it is connected to a constant current / chopper drive controller.