This part is a kind of semiconductor called ESM3045.

Function of this product has NPN DARLINGTON POWER MODULE.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

ESM3045DV NPN DARLINGTON POWER MODULE s s s s s s s HIGH CURRENT POWER BIPOLAR MODULE VERY LOW Rth JUNCTION CASE SPECIFIED ACCIDENTAL OVERLOAD AREAS ULTRAFAST FREEWHEELING DIODE ISOLATED CASE (2500V RMS) EASY TO MOUNT LOW INTERNAL PARASITIC INDUCTANCE INDUSTRIAL APPLICATIONS: MOTOR CONTROL s SMPS & UPS s DC/DC & DC/AC CONVERTERS s WELDING EQUIPMENT s ISOTOP INTERNAL SCHEMATIC DIAGRAM ABSOLUTE MAXIMUM RATINGS Symbol VCEV VEBO IC ICM IB I BM Pt ot T stg Tj VI SO Parameter Collector-Emitter Voltage (VBE = -5 V) Emitter-Base Voltage (I C = 0) Collector Current Collector Peak Current (t p = 10 ms) Base Current Base Peak Current (t p = 10 ms) Tot al Dissipation at T c = 25 o C Storage Temperature Max. Ope rating Junction Temperature Insulation Withstand Voltage (AC-RMS) Value 600 450 7 24 [ ... ]

ESM3045 PDF Datasheet Download