This part is a kind of semiconductor called BTS308.

Function of this product has Smart Highside Power Switch (Overload protection Current limitation Short circuit protection Thermal shutdown).

Manufacturers : Siemens Semiconductor Group

Image and pinout :

Some of the text within the PDF file :

PROFET® BTS 308 Smart Highside Power Switch Features • Overload protection • Current limitation • Short circuit protection • Thermal shutdown • Overvoltage protection (including load dump) • Fast demagnetization of inductive loads • Reverse battery protection1) • Undervoltage and overvoltage shutdown with auto-restart and hysteresis • Open drain diagnostic output • Open load detection in OFF-state • CMOS compatible input • Loss of ground and loss of Vbb protection • Electrostatic discharge (ESD) protection Product Summary Overvoltage protection Operating voltage On-state resistance Load current (ISO) Vbb(AZ) Vbb(on) RON IL(ISO) 60 V 4.7 ... 34 V 300 mΩ 1.3 A TO-220AB/5 5 1 Straight leads 5 5 1 Standard SMD Application • µC compatible power switch w [ ... ]

BTS308 PDF Datasheet Download