Fully integrated bipolar stepper driver — what it covers
The Toshiba TB67S101AFNG,EL is a fully integrated bipolar stepper motor driver that combines control logic and a power MOSFET output stage in one surface-mount package. It drives one bipolar stepper motor with four half-bridge outputs rated for 3 A continuous and a load voltage range of 10 V to 47 V. The parallel interface accepts step and direction signals from a motion controller or MCU, and the driver supports full-step, half-step, and quarter-step (1/1/2/1/4) microstepping resolution. This part is designed for general-purpose motion control applications — pick-and-place stages, conveyor drives, valve actuators, and similar industrial or office-automation equipment where a single-chip driver simplifies the BOM.
3 A output and 10–47 V load — sizing the motor
The 3 A current rating sets the torque capability for the connected stepper motor. For a given motor winding resistance, the available torque scales with current — a 3 A driver can handle NEMA 17 and smaller NEMA 23 frames in most applications, but you will need to derate for ambient temperature and package dissipation. The 10 V to 47 V load supply range gives flexibility: lower voltage reduces audible noise and heat, higher voltage improves high-speed torque by overcoming back-EMF.
48-HTSSOP with exposed pad — thermal and layout notes
The 48-HTSSOP package (6.10 mm body width, 0.5 mm pitch) includes an exposed thermal pad on the underside. At 3 A output, the power dissipated in the MOSFETs can exceed 2–3 W depending on duty cycle and motor resistance. Without adequate thermal management, the driver will current-limit or shut down under sustained load. The package is surface-mount only, so reflow soldering with a profile matching MSL 3 is standard.