# Stepper Motor: Bipolar, 200 Steps/Rev, 28×45mm, 4.5V, 0.67 A/Phase **Type:** Product page · **SKU:** POLOLU-1206 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia) **Page:** https://core-electronics.com.au/stepper-motor-bipolar-200-steps-rev-28-45mm-4-5v-0-67-a-phase.html ([markdown](https://core-electronics.com.au/stepper-motor-bipolar-200-steps-rev-28-45mm-4-5v-0-67-a-phase.html.md)) ## Retired product This product is retired and no longer available for purchase. Search the catalogue for an alternative. ## Description | [![](https://a.pololu-files.com/picture/0J2286.250.jpg?03f2124d8ece1d326e1806a964cd3b30)](https://a.pololu-files.com/picture/0J2286.1200.jpg?03f2124d8ece1d326e1806a964cd3b30) | |---| | Bipolar stepper motor wires are terminated with bare leads. | | ![](https://a.pololu-files.com/picture/0J2296.250.gif?d8febaea0bdf653188644bc9354bd0a5) | |---| | Bipolar stepper motor wiring diagram. | This hybrid bipolar stepping motor has a 1.8° step angle (200 steps/revolution). Each phase draws 670 mA at 4.5 V, allowing for a holding torque of 950 g-cm (13 oz-in). The motor has four color-coded wires terminated with bare leads: black and green connect to one coil; red and blue connect to the other. It can be controlled by a pair of suitable H-bridges (one for each coil), but Pololu recommend using a [bipolar stepper motor driver](https://core-electronics.com.au/breakout-boards-and-modules/motor-drivers-controllers/stepper-motor-drivers.html) or one of Pololu's [Tic Stepper Motor Controllers](https://core-electronics.com.au/breakout-boards-and-modules/motor-drivers-controllers/stepper-motor-drivers.html). In particular, the Tics make control easy because they support six different interfaces (USB, TTL serial, I²C, RC, analog voltages, and quadrature encoder) and are configurable over USB with Pololu's free configuration utility. Pololu's [5 mm universal mounting hub](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-5mm-shaft-4-40-holes-2-pack.html) can be used to mount objects on the stepper motor’s 5 mm-diameter output shaft. **Specifications** - Size: 28 mm square × 45 mm, not including the shaft (NEMA 11) - Weight: 140 g (5 oz) - Shaft diameter: 5 mm “D” - Steps per revolution: 200 - Current rating: 670 mA per coil - Voltage rating: 4.5 V - Resistance: 6.8 O per coil - Holding torque: 950 g-cm (13 oz-in) - Inductance: 4.9 mH per coil - Lead length: 30 cm (12") - Output shaft supported by two ball bearings More specifications are available in the datasheet (45k pdf). **Dimensions** The following diagram shows the stepper motor dimensions in mm. The dimension labeled “Length” is 45 mm. The output shaft has a length of 20 mm and a 5 mm diameter with a section that is flattened by 0.5 mm. This shaft works with Pololu's [5 mm universal mounting hub](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-5mm-shaft-4-40-holes-2-pack.html). | ![](https://a.pololu-files.com/picture/0J2289.600.jpg?0e5e38f7de40d16d8da6c58065f13071) | |---| | [![](https://a.pololu-files.com/picture/0J2297.300.jpg?d80d29ad1a0ae226923b71c68ddcbf9c)](https://a.pololu-files.com/picture/0J2297.1200.jpg?d80d29ad1a0ae226923b71c68ddcbf9c) | |---| | The inside of a bipolar stepper motor (SOYO NEMA 14-size). | **Stepper Motor Applications** Stepper motors are generally used in a variety of applications where precise position control is desirable and the cost or complexity of a feedback control system is unwarranted. Here are a few applications where stepper motors are often found: - Printers - CNC machines - 3D printer/prototyping machines (e.g. RepRap) - Laser cutters - Pick and place machines - Linear actuators - Hard drives | ![](https://a.pololu-files.com/picture/0J4511.600.jpg?bbe10f56dcfa8d58f2cce527dd1f1b13) | |---| | Pololu’s assortment of stepper motors. | **Note:** This stepper motor is SOYO part number SY28STH45-0674A. **People often buy this product together with:** | [![Pololu Universal Aluminum Mounting Hub for 5mm Shaft, #4-40 Holes (2-Pack)](https://a.pololu-files.com/picture/0J2468.100.jpg?48f58383f75147660070803af59277ee)](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-5mm-shaft-4-40-holes-2-pack.html) | [Pololu Universal Aluminum Mounting Hub for 5mm Shaft, #4-40 Holes (2-Pack)](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-5mm-shaft-4-40-holes-2-pack.html) | |---|---| | [![Stepper Motor: Bipolar, 200 Steps/Rev, 20×30mm, 3.9V, 0.6 A/Phase](https://a.pololu-files.com/picture/0J2280.100.jpg?82c52fb5c8727b3b7d16a0a6fd16dab6)](https://core-electronics.com.au/stepper-motor-bipolar-200-steps-rev-20-30mm-3-9v-0-6-a-phase.html) | [Stepper Motor: Bipolar, 200 Steps/Rev, 20×30mm, 3.9V, 0.6 A/Phase](https://core-electronics.com.au/stepper-motor-bipolar-200-steps-rev-20-30mm-3-9v-0-6-a-phase.html) | |---|---| | [![Stepper Motor: Bipolar, 200 Steps/Rev, 28×32mm, 3.8V, 0.67 A/Phase](https://a.pololu-files.com/picture/0J2281.100.jpg?e93a943e14fb61b3acfb39dbc6c7496b)](https://core-electronics.com.au/stepper-motor-bipolar-200-steps-rev-28-32mm-3-8v-0-67-a-phase.html) | [Stepper Motor: Bipolar, 200 Steps/Rev, 28×32mm, 3.8V, 0.67 A/Phase](https://core-electronics.com.au/stepper-motor-bipolar-200-steps-rev-28-32mm-3-8v-0-67-a-phase.html) | |---|---| **Dimensions** | Size: | 28 mm square × 45 mm[1](https://core-electronics.com.au/#note1) | |---|---| | NEMA size: | 11 | | Weight: | 140 g | | Shaft diameter: | 5 mm | **General specifications** | Shaft type: | 5 mm "D" | |---|---| | Current rating: | 670 mA[2](https://core-electronics.com.au/#note2) | | Voltage rating: | 4.5 V | | Holding torque: | 13 oz·in | | Steps per revolution: | 200 | | Resistance: | 6.8 Ohm[2](https://core-electronics.com.au/#note2) | | Inductance per phase: | 4.9 mH | | Number of leads: | 4 | | Lead length: | 30 cm | **Notes:** 1Not including the shaft.2Per coil. **File downloads** - **SY28STH45-0674A stepper motor datasheet (45k pdf)** - **3D model of the SY28STH45-0674A stepper motor (Pololu item #1206) (3MB step)** ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/s/t/stepper_motor_bipolar_200_steps_rev_28x45mm_4.5v_0.67_a_phase__pololu_1206__00.jpg)