This part is a kind of semiconductor called PMM-BA-5603-1.
Function of this product has The 5-Phase Stepping Driver.
Manufacturers : Sanyo
Image and pinout :
Some of the text within the PDF file :
Pulse I/F (AC power input) The 5-Phase Stepping Driver PMM-BA-5603-1 PMM-BA-5643-1 AC100V/115V Full-step/half-step (500 x 1 division) (500 x 2 divisions) Applicable motor ø60 ø86 ø106 Characteristics Flexible These drivers can drive various stepping motors of small to large capacities without adjustment for wide range uses. Small size and high torque Dedicated ICs are mounted to realize the small size and high torque as a result of parts consolidation and high reliability. Two types interface Two lineup types are: Terminal block type :PMM-BA-5603-1 Connector type :PMM-BA-5643-1 Built-in function Low-vibration control Our original control system employment enables a smooth and low-vibration operation. Pulse input system selection function Either single or double input system can be [ ... ]