This part is a kind of semiconductor called SS30.

Function of this product has Fan Motor Driver.

Manufacturers : ON Semiconductor

Image and pinout :

Some of the text within the PDF file :

Ordering number : ENA1878 SS30 Bi-CMOS IC For Notebook PC Fan Motor Driver http://onsemi.com Overview The SS30 is a 3 phase all wave sensor-less motor driver for notebook PC fans. Feature • Direct PWM 3 phase all wave sensor-less motor driver Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Symbol Conditions Ratings Power supply voltage Pre-drive voltage (gate voltage) VCC max VG max 6.5 10 Output pin current PWM input pin withstand voltage FG output pin withstand voltage FG output current 1/2FG output pin withstand voltage 1/2FG output current RD output pin withstand voltage RD output current Power dissipation 1 IOUT max VPWM max VFG max IFG max V1/2FG max I1/2FG max VRD max IRD max Pd max1 Independent IC 0.7 VCC 6.0 5.0 6.0 5.0 6.0 5.0 0.2 Power dissipat [ ... ]

SS30 PDF Datasheet Download