DC 9–42V power supply; 12–30V recommended Control signal input voltage: 3.3–24V (no series resistor required) Microstepping resolution: 1–32 steps (selectable) Output current: up to 4.0A H-bridge bipolar constant-current drive Upgraded version of TB6600, designed for two-phase hybrid stepper motors (NEMA 17/NEMA 23), with phase current ≤ 4.0A Microstep settings: 1, 2, 2A, 2B, 4, 8, 16, 32 (via 6-bit DIP switch) Current output settings: 0.5A, 1.0A, 1.5A, 2.0A, 2.5A, 2.8A, 3.0A, 3.5A (via DIP switch) Suitable for small- and medium-sized automation equipment, including engraving machines, marking machines, cutting machines, laser typesetting systems, plotters, CNC machines, crystal grinding machines, and automated assembly equipment Optimized for NEMA 17 and NEMA 23 stepper motors with holding torque ≤ 1.8 N·m Features: 1. High-speed optocoupler isolation for input signals 2. Built-in thermal and overcurrent protection 3. Automatic half-current mode to reduce heat generation 4. Motor noise reduction function Note: Product design and appearance may vary slightly between batches due to ongoing improvements. Such variations do not affect functionality. Color: As shown in image Material: ABS Package includes: 1 × Stepper motor driver Note: Other accessories or devices shown are not included. Please note that screen settings and lighting conditions may cause slight color variation between the image and the actual product. Measurement tolerance: ±1–3 cm.