CF21022M 2-phase stepper motor driver CF21022M is one of the new Diect-on-line step motor driver, available in the industry, which can be simple power up from the AC power source without the need of a power supply, this makes it cost effective and efficient, with a higher voltage input, this high performance bi-polar two phase micro-stepping drive is able to excite a motor size from Nema 42, it can drive 2-phase hybrid motor that comes in 4,6 or 8 leads. Key Features Maximum steps for 12800 steps Over Voltage, Coil to Coil and Coil to ground short dircuit protection