Features: brand new and high quality TMC2209 quiet motor driver IC- (original imported chip) for two-phase stepping motor. The TMC2209 compatible with many traditional drivers and TMC2208 pins. The TRINAMICs advanced StealthChop2 chopper ensures noiseless motor operation, achieving high efficiency and motor torque. Its fast current regulation and resonance suppression function combination can achieve high dynamic movement. Built in power MOSFET can handle motor current up to 2A RMS, with protection- and diagnostic functions, and can achieve stable and reliable operation. The drive can be set to operate noiselessly and very precisely through a separate pulse direction, enabling a cost-effective and competitive solution Specifications: Item: TMC2209v4.0 Stepping Motor Driver Hardware compatible and PololuA4988 Drive capability up to 1.7A continuous current - 2.8A Step/Dir with microstep interpolation (up to 256 microsteps) Configuration via CFG pins or UART interfaces Motor voltage: 5.5...28V RSense: 0.11Ohm stealthChop2- for quiet operation and smooth motion spreadCycle- highly dynamic motor control chopper (enableable via UART,CFG Pin) current control for energy savings stallGuard4- sensorless motor load detection Size: approx 20x15mm/0.79x0.59in Package Includes: 1PC TMC2209V4.0 Stepping Motor Driver 1PC Radiator 1PC Screwdriver note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.