This part is a kind of semiconductor called BD204.

Function of this product has Silicon PNP Power Transistor.

Manufacturers : Inchange Semiconductor

Image and pinout :

Some of the text within the PDF file :

INCHANGE Semiconductor isc Silicon PNP Power Transistor DESCRIPTION ·Collector-Emitter Breakdown Voltage- : V(BR)CEO = -45V(Min)- BD202 -60V(Min)- BD204 ·Complement to Type BD201/203 APPLICATIONS ·Designed for use in hi-fi equipment delivering an output of 15 to 15 W into a 4Ωor 8Ωload. ABSOLUTE MAXIMUM RATINGS(Ta=25℃) SYMBOL PARAMETER VALUE UNIT BD202 -60 VCBO Collector-Base Voltage V BD204 -60 BD202 -45 VCEO Collector-Emitter Voltage V BD204 -60 VEBO Emitter-Base Voltage -5 V IC Collector Current-Continuous -8 A ICM Collector Current-Peak tp≤10ms -12 A ICSM Collector Current-Peak tp≤2ms -25 A IB Base Current PC Collector Power Dissipation @ TC=25℃ TJ Junction Temperature -3 A 60 W 150 ℃ Tstg Storage Temperature Range -65~150 ℃ THERMAL [ ... ]

BD204 PDF Datasheet Download