This part is a kind of semiconductor called 23HS5604.
Function of this product has Hybrid Stepper Motors.
Manufacturers : ETC
Image and pinout :
Some of the text within the PDF file :
HYBRID STEPPING MOTORS 0.9˚ 2-PHASE 1.8˚ 3.6˚ 23HS SERIES 1.8° Key Features I High Torque I High Accuracy I Smooth Movement General Specifications Bi-polar Model Number 23HS0402-02 23HS0403-02 23HS0404-01 23HS0406 23HS0411 23HS0412 23HS0413 23HS1407 23HS1408 23HS2403 23HS2409-01 23HS2416-03 23HS2420-01 23HS2428 23HS2434 23HS2438 23HS2443 23HS3409 23HS3431-02 23HS3432-02 23HS3434 23HS3442 23HS3443 23HS4401-09 23HS4402 23HS4404 23HS5402-08 23HS5408 Resistance Inductance Rated per Phase per Phase Current ohm mH A 1.2 2.3 2.1 2.8 7 1.3 0.75 1.75 2.5 1.6 4.3 1.5 0.65 1.3 2 11.4 22.4 0.71 4.3 10 1 2.7 7 1.5 1.5 3.7 2 2 6.4 2 0.85 2.7 3 1.0 3.1 2.6 1.54 4.6 1.8 0.62 2 2.8 14 43 0.7 5.6 20.4 1.15 3.4 9.2 1.5 1 3.36 3 1.2 4 2.8 2 7.5 2.1 4.2 17 1.4 7.9 [ ... ]