This part is a kind of semiconductor called 2SA1941.

Function of this product has POWER TRANSISTOR.

Manufacturers : Inchange Semiconductor

Image and pinout :

Some of the text within the PDF file :

www.net INCHANGE Semiconductor isc Product Specification isc Silicon PNP Power Transistor 2SA1941 DESCRIPTION ·Low Collector Saturation Voltage: VCE(sat)=- 2.0V(Min) @IC=- 7A ·Good Linearity of hFE ·Complement to Type 2SC5198 APPLICATIONS ·Power amplifier applications ·Recommend for 70W high fidelity audio frequency amplifier output stage applications ABSOLUTE MAXIMUM RATINGS(Ta=25℃) SYMBOL PARAMETER VALUE UNIT VCBO Collector-Base Voltage -140 V VCEO Collector-Emitter Voltage -140 V VEBO Emitter-Base Voltage -5 V IC Collector Current-Continuous -10 A IB B Base Current-Continuous Collector Power Dissipation @ TC=25℃ Junction Temperature -1 A PC 100 W TJ 150 ℃ Tstg Storage Temperature Range -55~150 ℃ isc Website：www.iscsemi.cn [ ... ]

2SA1941 PDF Datasheet Download