This part is a kind of semiconductor called B679.

Function of this product has Silicon PNP Power Transistor.

Manufacturers : INCHANGE

Image and pinout :

Some of the text within the PDF file :

INCHANGE Semiconductor isc Silicon PNP Power Transistor isc Product Specification 2SB679 DESCRIPTION ·High Power Dissipation- : PC= 100W(Max.)@TC=25℃ ·Collector-Emitter Breakdown Voltage- : V(BR)CEO= -120V(Min.) ·Complement to Type 2SC1079 APPLICATIONS ·Designed for audio power amplifier applications. ABSOLUTE MAXIMUM RATINGS(Ta=25℃) SYMBOL PARAMETER VALUE UNIT VCBO Collector-Base Voltage -120 V VCEO Collector-Emitter Voltage VEBO Emitter-Base Voltage IC Collector Current-Continuous IE Emitter Current-Continuous Collector Power Dissipation PC @TC=25℃ Tj Junction Temperature Tstg Storage Temperature -120 V -5 V -12 A 12 A 100 W 150 ℃ -65~150 ℃ isc Website：www.iscsemi.cn INCHANGE Semiconductor isc Silicon PNP Power Transistor isc Product Specification 2S [ ... ]

B679 PDF Datasheet Download