Feature: 1. Applicable for: 2 phase stepper motor driver is suitable for various 2 phase hybrid stepper motors of 39, 42 and 57. 2. High Reliability: Excellent over current and over voltage protection topology circuit enables the driver to start self protection even at extremely high speed and moderate over voltage to ensure that it will not be damaged. 3. Excellent Performance: The anti resonance of the motor driver can achieve optimal torsion, ultra smoothly movement, low motor heat and noise. 4. Reliable Materials: Made from premium ABS and aluminum alloy materials, the stepper motor driver has great stability and durability. 5. Wide Range: The stepper driver has a wide input voltage range of DC20 to 50V, and wide drive current of 1 to 4.2A, ensures multiple applications. Specification: Item Type: Stepper Motor Driver Material: ABS, Aluminum AlloyParameter Minimum Value Typical Value Maximum ValueUnit Input Voltage 20 48 50 VDC Drive Current 1.0 - 4.2 A Input Pulse Frequency 1 - 200K Hz Input Pulse Width 250 - 5E+8 ns Input Signal Voltage 3.3 5 24 VDC . Package List: 1 x Stepper Motor Driver