This part is a kind of semiconductor called FD1257H.

Function of this product has Smart motor driver.

Manufacturers : Feeling Technology

Image and pinout :

Some of the text within the PDF file :

FEELING TECHNOLOGY Features Motor driver with integrated Hall sensor Lock-shutdown protection & auto-restart function Precise magnetic switching thresholds “Soft-switch” phase-switching technique to reduce vibration and acoustic noise Thermal shutdown protection Available in SIP-4L packages For 12V systems FD1257H Smart motor driver with embedded Hall sensor Halogen Free General Description FD1257H is a single coil motor driver with embedded Hall sensor. It integrates the motor driver with the Hall sensor, which simplifies the PCB(printed circuit board) design and make the fabrication of small-size motors possible. Lock-shutdown and auto-restart function keeps the motor from being over-heated and restarts the motor after being locked. “Soft-switch” phase-switching technique is u [ ... ]

FD1257H PDF Datasheet Download