This part is a kind of semiconductor called 17HD0013.

Function of this product has Hybrid Stepper Motors.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

HYBRID STEPPING MOTORS ƶ0.39in. ƶ1.10in. ƶ1.38in. ƶ1.53in. ƶ1.65in. ƶ2.22in. ‡2.25in. ƶ2.36in. ƶ3.35in. ‡3.39in. (ƶ10mm) (ƶ28mm) (ƶ35mm) (ƶ39mm) (ƶ42mm) (ƶ56.4mm) (‡57.2mm) (ƶ60mm) (ƶ85mm) (‡86mm) 17HD SERIES 1.8° Key Features I High Torque I Low Noise I Small Size General Specifications Bi-polar Model Number Resistance Inductance Rated per Phase per Phase Current ohm mH A 17HD0013 30 27 0.4 17HD1004-01 25 50 0.5 17HD3005-10 30 45 0.4 17HD5003-10 24 36 0.4 Holding Torque mNm oz-in 260 36.83 400 56.66 460 65.16 180 25.50 Detent Torque mNm oz-in 12 1.70 15 2.12 25 3.54 5 0.71 Rotor Inertia g.cm2 oz-in2 38 0.21 57 0.31 82 0.45 20 0.11 Motor Wiring Diagram > Page A-8 Mechanical Dimension Model Number 17HD0** 17HD1** 17HD3** 17HD5** L mm (in.) 33 [ ... ]

17HD0013 PDF Datasheet Download