This part is a kind of semiconductor called BD939.

Function of this product has (BD933 - BD941) Silicon NPN Power Transistor.

Manufacturers : Inchange Semiconductor

Image and pinout :

Some of the text within the PDF file :

INCHANGE Semiconductor isc Product Specification isc Silicon NPN Power Transistor DESCRIPTION ·DC Current Gain: hFE= 40(Min)@ IC= 150mA ·Complement to Type BD934/936/938/940/942 APPLICATIONS ·Designed for use in output stages of audio and television amplifier circuits where high peak powers can occur. ABSOLUTE MAXIMUM RATINGS(Ta=25℃) SYMBOL PARAMETER BD933 BD935 VCBO Collector-Base Voltage BD937 BD939 BD941 BD933 BD935 VCEO Collector-Emitter Voltage BD937 BD939 BD941 VEBO IC ICM IB B BD933/935/937/939/941 VALUE 45 60 100 120 140 45 60 80 100 120 5 3 7 0.5 30 150 -65~150 UNIT V V Emitter-Base Voltage Collector Current-Continuous Collector Current-Peak Base Current-Continuous Collector Power Dissipation @ TC=25℃ Junction Temperature Storage Temperature Range V A A A W ℃ �� [ ... ]

BD939 PDF Datasheet Download