This part is a kind of semiconductor called 2SA2121.

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 isc Product Specification 2SA2121 DESCRIPTION ·High Current Capability ·High Power Dissipation ·High Collector-Emitter Breakdown Voltage- : V(BR)CEO= -200V(Min) ·Complement to Type 2SC5949 APPLICATIONS ·Power amplifier applications ·Recommended for audio frequency amplifier output stage. ABSOLUTE MAXIMUM RATINGS(Ta=25℃) SYMBOL PARAMETER VALUE UNIT VCBO Collector-Base Voltage -200 V VCEO Collector-Emitter Voltage -200 V VEBO Emitter-Base Voltage -5 V IC Collector Current-Continuous -15 A IB Base Current-Continuous PC Collector Power Dissipation @ TC=25℃ TJ Junction Temperature Tstg Storage Temperature Range -1.5 A 220 W 150 ℃ -55~150 ℃ isc website：www.iscsemi.cn 1 isc & iscsemi is registered t [ ... ]

2SA2121 PDF Datasheet Download