This part is a kind of semiconductor called BAL6686.

Function of this product has Motor Driver IC.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

10mm The Board Room BEAMod - Modular building blocks for BEAM robotics © Bill Bigge 2001 Servo IC replacement 1.0 (Untested) A replacement PCB for the Tower Hobbies Servo as sold by Solarbotics designed to use the driver IC from the existing servo board as a foreward and reverse controller. The IC is not capable of controlling the motor speed, it works only as an on/off controller unless you drive it with a pulsed signal. The IC should be fairly easy to desilder from the origional board as it is a single sided PCB. The board should also work in other makes of servo. Motor Motor driver IC from Tower Hobbies servo Top 0.22uf BAL6686 Front BAL6686 Side Vcc Gnd Vcc Motor on 1 (Fwd) Gnd on 2 (Rev) Not used Motor 1k ww. dnG ccV [ ... ]

BAL6686 PDF Datasheet Download